power curved crank bicycle-Power up 25%-30%

[gglen2141]

My first thought was along the line of many posts here. The shape is irrelevant as it is just a fancy way of getting from point A to point B. (crank to pedal = Xmm) BUT. Then I thought about sword design. WHY does a curved blade cut more efficiently?? Shouldn't it be a function of distance from handle to cut point x speed?? But it's not...........

[MrMeanderthal]

this is a joke right? a crank arm can be any shape you want but it makes no difference at all.. all that matters is the distance between the two points.. 172.5 mm is 172.5 mm no matter how you get there..

[celine8168]

@MrMeanderthal Pedaling on UDC and 2’oclock direction by using straight cranks, they both under lever theory but why the effort saving is different？Why are different provincial efforts between UDC and 2’oclock direction on Lever theory?

[buioso]

@celine8168 MrMeanderthal is right, trust me. The curved arm is even worst than the straight one, needing more material (and so weight)

[Cokoholicar]

@MrMeanderthal

hahahaha so true, I can't believe people that think like that actually have the knowledge to make a 3d model, it's insane

[17473039]

@SGTMARSHALL1 by 'by hand' do you mean on state of the art, multi million pound cnc and cmm equipment? And submarines are nuclear powered, propeller driven not pedal powered. Troll fail

[SGTMARSHALL1]

@17473039 Nuclear power is the system that turns the ??? Propeller Blades ! You are a smart cookie, I almost under estimated you Almost, Epic fail Lmao

[korsez]

You know there is free energy magnet motors (saw on YouTube). You could attach one to your bike. Then there will be no need to pedal at all:DDDDDD

[SGTMARSHALL1]

@korsez The system you talk of may not be legal for road use, so you are back to pedals, and I would rather save my energy than use straight crank design, this Curved crank is far superior to standard styles it should be 5 times the price

[korsez]

@SGTMARSHALL1 wtf dude? I was making jokes from this your idea... so in your theory is i add more curves to pedal cranks like S so maybe i wont be needing to pedal at all?

[SGTMARSHALL1]

@korsez You cant add more curves, you will counter the effect, but you wouldnt know that because you have never tried it ! Go play with crayons and stop wasting my time

[korsez]

@SGTMARSHALL1 go play with your magic crank, wtf dude do you really don't understand???? Pedaling this crank will give the same amount of power and the moment of transferred power will be the same as in normal cranks

[SGTMARSHALL1]

@korsez You have never tried them have you ? not one person here who has treid them has placed a negative comment ! Well here is your chance, I will ship 1x Limited Edition complete set of Cranks to the first person with the balls to try them. The first person to send me a personal message with shipping details will receive a set for free ! After you try them you have to comment here if they work as described or not. Im not like you backseat drivers, I put my money where my mouth is !

[MRryuhayabusa]

combine that with rotor q ring and off u go

[celine8168]

@MRryuhayabusa Two of my friends use originally is Q-ring, but they change the curved crank, and feel very happy.

[whitebear26]

@celine8168 if you think it works , it works because you bealive - plasebo effect

[thePavuk]

Basic physics and dynamics say that there is no "power" increase because IF the crank is solid then you can replace curve with straight line between center of rotation and point of force for counting moments and it will be same in all positions. Difference is only in lower stress on crank. Sorry. It's nice, it's cool, but it's useless.

[thePavuk]

@thePavuk oww, I didn't read that so many people here have written the same thing.

[celine8168]

@thePavuk So Pedaling on UDC and 2’oclock direction by using straight cranks, they both under lever theory but why the effort saving is different？The sickle crank’s pedal is on the UDC position, but the force arm has already move to 2 o’clock direction.An England famous E-BIKE company had also approved this sickle could increase the battery capacity to 18%.

If you just guess and did not do the experiment , it is a scientific superstition of the two points of leverage.

[Brosnake9000]

@celine8168 Physics vs a bunch of words you though strung together? I'ma go with physics.

[fujioko]

@thePavuk

ThePavuk is correct. This cranks set doesn't offer any mechanical advantage. 

[SGTMARSHALL1]

@thePavuk I can tell you have not tried these cranks, Everyone is entitled to an opinion but you should only express this in public when you are talking from experience. They do work and they are worth trying, I am speaking from experience

[ClownFight]

Increase profits by 25% to 30% with our revolutionary sickle crank design. The design works by targeting the feeble minded who see the art and the beauty of the curves and flowing lines of the magnificent sickle crank. What they are unable to see is the invisible line that forms the moment arm, a concept they have never heard of in Art school. Unburdened by the mysteries of physics they will buy this crank and feel a power increase directly related to the reduced weight of their wallet. Genius!

[celine8168]

@ClownFight Thanks your compliments. It's the most pertinent and fair discussion, and the most depth reply that I have read. Surely you must be involved in the mechanical and aesthetic.

[phbrazio]

LOL total sarcasm comprehension meltdown. now *this* is poetry. or performance art?

[Kounglou]

@ClownFight

I actually have to dissagree on the reduced weight thris crank increases the wheight more then then the lighter wallet due to a longer crank arm.

[SGTMARSHALL1]

@ClownFight - The Curved ( Sickle ) style crank is a varient of Leonardo's perpetual concept, this is such a simple concept I am amazed to see so many from the cycling field cant see the benifits from this design, I have not seen one person come up with a complaint who speaks from personal experience. I personally dont care if they ever try these cranks, I actually prefer that they stay exactly the way they are ! They will only accept it when it passes them on the road and not before

[MrDanoonah]

this construction does nothing, fucked garbage idea!!

[celine8168]

@MrDanoonah Why are different provincial efforts between UDC and 2’oclock direction on Lever theory?Although the sickle crank’s pedal is on the UDC position, but the force arm has already move to 2 o’clock direction.An England famous E-BIKE company had also approve this sickle crank can increase the battery capacity to 18%.Do not just use one senstence to judge this curved crank, Because it is designing over ten years.

[heldgop]

u would be better of if u had invested the time to learn about CAD and rendering if u just read a simpel mecanics book.....

[paspax]

It's just fancy marketing "backed" by pseudo-science.

It's a curvy crank.

Looks OK though.

[PacificCircle1]

This just rotates gear ahead about 25%.

One's power is still 'tween 2 and 4 o'clock

[celine8168]

@6000Robert please go their web tks

[330MillionGods]

this idea is nonsense.

[celine8168]

@330MillionGods If this is a nonsense product, so why it can pedaling by 56T gear, can u use 56T on straight? U cant but curved crank can and very easy pedaling feel like 50T gear.

[playingwithfirehurts]

@celine8168 your reply is nonsense

[celine8168]

@playingwithfirehurts They had SGS test report

h

IT proved this product can increase 33% power.

And a USA cyclist test by HR. IT reduced the HR obviously.

[baca262]

@celine8168 this is a pure gimmick, it's no different than a straight crank, only heavier.

[celine8168]

@baca262 I want to ask u a question. Pedaling on UDC and 2’oclock direction by using straight cranks, they both under lever theory but why the effort saving is different？

The sickle crank’s pedal is on the UDC position, but the force arm has already move to 2 o’clock direction.

An England famous E-BIKE company had also approved this sickle could increase the battery capacity to 18%.

This sickle crank set is using trigonometric function to calculate its effective force area.

[arielsuarez]

@baca262 It is different from a straight crank because it is heavier.

[celine8168]

@arielsuarez And it can increase power 33%!

[jwserge]

это трындец...

А говорят, что Россия страна дураков.........

опять обманули........

[celine8168]

@jwserge Please go to see my former message. If this is a fool design why it can reduce the HR obviously. Besides, over 500 people use this product and prove its effect. This company very concern on product quality.

Their top product all sold out and lack of stock ,so many clients must wait at least 2 month until this month to get the order.

[jwserge]

@celine8168 How can you say about so called effect?!! How did you determine that effect? Ppl say? Where is that ppl? The only I see here is you with your slippery statement.

I'm very sorry that I was very good in school to learn physics, so your statements look... have bad look.......

Whatever form of crank the turning moment still the same, no other physic law in the world of reality. But there are lots of trick laws in the worlds of illusions or commerce.

We say: NO LIE NO SELL

[celine8168]

@jwserge I want to ask u a question. Pedaling on UDC and 2’oclock direction by using straight cranks, they both under lever theory but why the effort saving is different？

The sickle crank’s pedal is on the UDC position, but the force arm has already move to 2 o’clock direction.

An England famous E-BIKE company had also approved this sickle could increase the battery capacity to 18%.

This sickle crank set is using trigonometric function to calculate its effective force area.

[jwserge]

@celine8168 that means: a one can't sell without first deceiving a buyer....

That is exactly what you actually do here.

[ondahonda]

wow. hears the deal. the crank does nothink to improve power. if you think it works better thats because it's 'stifer' than your old cheap die cast ones. that is all crank upgrade will see a noticable improvement in power. but whoeve said this is just extra weight was dead right. go and get some shimano xtr cranks to compare with before making long winded claims. leave the engineering up he engineers dude. you clearly suck at it. nice craftsmanship though.

[celine8168]

@ondahonda You can go check the before message i replyed. Again ! Why the HR can reduce by using this crank or can enlarge the chain to 56T but pedaling feel like 50T.

Why are different provincial efforts between UDC and 2’oclock direction on Lever theory?

Don’t think about everything by thought and mouth, you should really do it to prove it.

[stopglobalswarming]

Look up PowerCranks. They have a ratcheting system that FORCES the rider to pedal all the way around (with cleated shoes). That has some merit, but this doesn't do anything. It looks kind of cool though. Put it on Walmart bikes and you will make $5,000,000.

[celine8168]

@stopglobalswarming PowerCranks and Power Curved Crank is not the same. And Power Curved Crank had already put on over 500 bike in Taiwan and really feel its effect.

[vistigioful]

For all you skeptics out there I really think this works. SGTMARSHALL1 has said from experience that this works. It is simple. The cranks have added weight, which is obviously in motion, creating momentum, helping to rotate the cranks. I understand how in a way the weights cancel eachother out, but I am not sure that they totally do. As the cranks rotate around faster you are picking up the weights faster and forcing them down faster, which I think might be a gain effect.

[celine8168]

@vistigioful the most important thing is we change the force direction remove the dead point. There are over 500 people buy it and prove its effect and very happy to use it.

[schlusselmensch]

This is a complete load of bollocks. Why not then mount the pedals on a disc? Then the "force arm" would occur at infinite points. FTL Drive might be within reach!

[celine8168]

@17473039 @Joru666 @Numiah @SGTMARSHALL1

Pedaling on UDC and 2’oclock direction by using straight cranks, they both under lever theory but why the effort saving is different?

The sickle crank’s pedal is on the UDC position, but the force arm has already move to 2 o’clock direction.

An England famous E-BIKE company had also approved this sickle could increase the battery capacity to 18%.

[celine8168]

@celine8168 I want to ask the friend work in Rolls-Royce. Are you a engineer work in engine design or Steering system design?

If you are not the person who designs the engine, front steering or transmission system probably you don’t know what is “toe-out-on-turn” .

Benz is using the “toe-out-on-turn” most, many cars are using this, and the Benz is most obviously.

The engine crankshaft is also using the “toe-out-on-turn” theory

.

[celine8168]

@celine8168 For example, the engineer equipments-Grader are far away from the cockpit and the front wheel, and automobile is very long. Therefore, especially in the steering system set a hydraulic device that can use by hand mode to change the toe-out-on-turn angel to help the grader turning.

So this person who work in Rolls-Royce you may study more

Furthermore, even the air plane’s safe doors all use this kind design, it hard to close and it is very easy to open it.

[celine8168]

@celine8168 If you just guess and did not do the experiment , it is a scientific superstition of the two points of leverage

This sickle crank set is using trigonometric function to calculate its effective force area.

Besides when you test you must use mechanical torque measurement instead of electric induction torque measurement

[celine8168]

@celine8168 It is said that the crank designer is a mechanical engineer retired from Taiwan Air Force Mechanical Engineer. He had said that he wouldn’t design the product its effort saving only 10%, because that kind of design is too lousy.

Don’t think about everything by thought and mouth, you should really do it to prove it.

[ZorroUA]

@celine8168 this video and it's comments show HOW MANY people have no idea about BASICs of mechanics )))))))))))))))))))

Show it to shcool teacher of phisics or basicly try such a device in a real life )))) LOL

[celine8168]

@ZorroUA This product had already produced. In Taiwan there're many people try it and agree its effect. And buy it~!

[ZorroUA]

@celine8168 I bet 100000 dollars that there is NO effect, except those one from knowing that you are riding an advanced bicycle !!! It's solely MENTAL effect. I mean, no equipment may measure coefficient of efficiency improvement after installation of curved crank !!! There is another stuff like oval gear between pedals, known like 20 or 30 years by the moment. There you can feel some REAL effect ! But also not real improvement, otherwise it would be used on modern bicycles ))))))

[celine8168]

@ZorroUA Pedaling on UDC and 2’oclock direction by using straight cranks, they both under lever theory but why the effort saving is different？

A USA cyclist test curved crank by Comu Trainer for us . He input the same effort to test the Heart Rate, and it (can) reduce the AVG HR 11 bpm and Max HR 5 bpm.

[celine8168]

@ZorroUA SGS test sickle crank by using mechanical torque measurement in stead of the electric induction, because with the process of time, there is no basic data(formula) to be used in electric induction and it need to use chain to test the tensile value.

If you could get a internationally recognized inspection institution to do the test, we would like to provide one set for you to test. I think you had better prepare your ten grands in advance.

[celine8168]

@ZorroUA There are two ways to lift efficiency – the relative value and the absolute value. Right now most products are using relative value. Our curved cranks use relative value, too. It gets losing power back and compared with straight cranks , it increase torque to 33%

[ZorroUA]

Step 4. We CUT OUT STRAIGHT PIECES of cranks (cutted or cracked before) leaving only curved ones ! Try bicycle again. Apparently nothing happens again. The last step doesn't change anything. It's still THE SAME BICYCLE ! BUT WITH CURVED CRANKS !

MYTH BUSTED !!!

[celine8168]

@ZorroUA I am the user, and I already put a set on my bike. I had already used it for over a year, and Its really very good to use.You should really experience it not thinking in your brain.

[ZorroUA]

@celine8168 Thanks, but I'm kind of person who THINKS and THEN DOES !!!

[celine8168]

@ZorroUA Just like the Computer Aid Graphic Design , it also have relative and absolute coordinates. If it is absolute value lifting , we would beat Einstein, so our cranks are increasing relative value to 33% compared with straight cranks

Let me remind you that the calculation formula of sickle cranks are not using lever theory but using trigonometric function to calculate its effective force area

If you’re using lever concept, it can’t be calculated.

[17473039]

Its NO DIFFERENT from a normal crank. I have even shown this to my colleagues at Rolls-Royce and they all agree with me. Rolls-Royce build jet engines, they know a thing or two about state of the art engineering technology.

[SGTMARSHALL1]

@17473039 Dont they still make everything from scratch by hand ? Why would Submarines use this concept for propulsion and not release specifications. You can google it, get back to me when you have an arguement

[celine8168]

the following message is from weightweenies.starbike.com

[celine8168]

My personal opinion

There are two kinds of scientist since long time ago- practice and laboratory scientists.

Science calculation is to explain nature phenomenon not simply to examine its possibility. The sickle crank’s efficiency is fact and proved. It is said that SGS was surprised, too when they got result.

The follows comes from official website

[celine8168]

According to maker’ data, they did integral calculation by every 10 degree then total work got 33% efficiency that is compared with traditional straight crank.

On upper dead point , straight crank is vertical to axle ,so most of pedaling force are　lost on this angle. However sickle crank not only center gravity forward but also effectively pass through upper dead point and reduce loss, so output increases by 33% compared with straight crank..

[celine8168]

Those have opposition or think lever theory about curved cranks, if their viewpoint is correct, why people so surprise curved crank’s efficiency after riding.

As I know the efficiency comes from the gravity of cranks forward , in other words, toe-out effect. The calculation formula is not using lever theory but using trigonometric function to calculate its effective force area

[celine8168]

There is a cyclist in USA test curved crank the MAX HR reduce 5 rpm, and AVG HR reduce 11rpm.

you can see the official website there are more test information

[Joru666]

@celine8168 There are many people who make extraordinary claims just to improve sales of a product. Do not let yourself get fooled that easily, crank is the very simplest mechanical mechanism there is, are you certain we didnt know pretty much everything about it for decades now? Would you rather believe there is some alternative science that has just been discovered and used in just a bike as opposed to space travel, energy industry and big scale locomotion? I for one would not.

[ThiagoMarquardt]

two words. Resultant vector. Basic physics explain why this crankshaft doesnt have any advantage.

[Joru666]

as a mechanical engineer I call this a scam or in best case - a lump of broscience

[celine8168]

@Joru666 There is a cyclist in USA test curved crank the MAX HR reduce 5 rpm, and AVG HR reduce 11rpm.

you can see the official website there are more test information

[Numiah]

Putting the pedals on two large discs would even improve huh ?

Nope.

Totally doesn't matter how the force applied to the pedals is transferred to the shaft Because the direction of the force is the same, as is the amount.

Looks cool though, I admit.

[celine8168]

@Numiah you can search curved crank on google there are some people experience on weightweenies forum

[Kounglou]

Err law of physics?

The only thing that matters is the distance between the bb center and the pedal center what is used to calculate torq/ft

[SGTMARSHALL1]

@Kounglou You are incorrect ! Your not applying the laws of gravity and momentum, and I can tell you have never tried a set of these cranks, so you are not talking from experience. Dont you look stupid now ! I you get an empty or full Ferris-wheel and disconnect it from the motor nothing happens, if you fill the carts from 12o'clock to 4o'clock and release it from the motor what happens ? I should be teaching at pre-school

[17473039]

@SGTMARSHALL1 This is true but the pedals are 180 degrees apart and therefore balanced, so gravity does not need to be considered when calculating torque at the crank. Teaching pre-school sounds like a great idea. New generations wouldn't be subject to your introducing of irrelevant mechanical principles.

[SGTMARSHALL1]

@17473039 Gravity and Momentum apply because the are not stationary weight like your brain cells, they are a moving part, the more weight they carry combined with more revolutions makes them easy to turn and harder to stop ! Why is that children ? If you get a Train and a Bus up to 100 kms per hour and put them in neutral which will keep going further the Light Bus or the Heavy Train, it should be a no brainer but I will give you a clue THE TRAIN ! now which cranks will turn longer ?

[17473039]

I am not denying that heavy things are harder to stop than lighter things, that would be obtuse. However, where a crank is balanced, there are no unbalanced forces because gravity acts on both sides of the pivot point of the crank equally. Newtons 1st law states that any object will remain in a state of constant speed so long as the forces are balanced. Balance = no change in speed= NO ACCELERATION. Acceleration is proportional to torque, so if acceleration is 0 torque is 0.

[paulinhosakano]

This is stupid ,but the design is great .

[shredmiester4000]

sorry this is ridiculously stupid

[gratisnepkut]

Smoking crank is very very bad !!!

[stopglobalswarming]

DERP. The pedal axle still travels in a circle, and now you have a flexier crank with new weak spots. It does look kind of neat though.

[celine8168]

@stopglobalswarming sgs test report had proved you can check

[stopglobalswarming]

@celine8168 What is an SGS? I am not convinced. The best thing you can do is get a really stiff crank and bb like XT splined cranks and get some serious derailleur pulleys like Carmichael.

[sween187]

@stopglobalswarming it because the crack is longer, think of loosing a nut with a short spanner it much easier with a longer one.

[SGTMARSHALL1]

Q-rings, Bio-pace and Osymetric chainrings are all good choices but they still need the cyclist to put in more effort than needed. Vistigioful- you ask where I would add weight : add weight forward 90 degrees as far as possible and at the top above the pedal, I increased the thickness to maximize weight using the space behind the crank that wont affect the rider and the angle of the pedal is also important for the power stroke. the will be a point where it will cancel the effect, you will know

[ChrisLuxembourg]

NO GAIN EFFECT! Better you'll choose 'ROTOR Q-RINGS' or 'BIOPACE'

[SGTMARSHALL1]

To vistgiofulI :- I was checking the reglulations for the Tour de france when you sent your message, I have designed my own crank-arms and wish to find a team to race them. I cannot race due to a spinal injury, the cranks help me to ride with less effort and still get more speed than before my injury. I would not recommend a product without testing it first, I come from the Defence force and always tested my gear for durability, function and performance. The cranks are worth every dollar !!!

[vistigioful]

@SGTMARSHALL1 What if you would add weight to the very end of the cranks. Wouldn't that create momentum and help the cranks to spin around faster. The weight being on the end of the cranks would give you more leverage. Why not make the end of the cranks like a brick.

[SGTMARSHALL1]

@vistigioful You are correct ! I have included that in my design, but you need to balance between the forward weight and top end, forward weight builds acceleration and helps in the dead curve zone, the top end weight helps maintain speed. As you increase the weight you need to upgrade the chainring size to keep the cadence the same, your body works like a motor and cannot sustain long periods at high RPM, it is great to see someone finally understand it. You can email me for more details

[yliaDenaLtsaF]

You can also increase power by adding stickers and using a dreamcatcher....

[WXIIIR]

you can increase something but not really 25% more torque without sacrificing speed. also the current transmission design on bicycles is over 90% efficient

[z1nyc]

This crank 'idea' is garbage, especially the claim of 25% power increase. It's abunch of BS. All you are doing is increasing the weight of your crankset. You know NOTHING about physics otherwise. You only increase leverage by increasing the distance between the center of the crank and the pedal. Take a basic physics class next time before attempting to re-invent stupid.

[z1nyc]

Congratulations, this was done 30 years ago already, MAJOR FAIL v2.0.

[scienceisthebesttool]

@z1nyc Exactly. I remember them. Total waste of time.

[heykoltrane]

makes sense. reduced power loss and higher rigidity, just like the strength advantage of an arc bridge over its straight-beam counterpart. where can you pick them up?

[Igotbadjoints]

Mechanical advantage does not change here, anyone that does not understand this does not understand Basic Engineering Principals.

[oliverch1]

THAT'S BULLSHIT

[SGTMARSHALL1]

It may appear that the weight is cancelled out by the opposite crank but they help other crank by producing its own momentum because they both travel in same direction. Honestly we can discuss this till we both turn blue but the only way to find out for sure is to try them. I dont have time for shit products, I just gave it a go and was so impressed, I have placed an order for 4 more sets in various colours for my family. Do your self a favour and try them, best money ever spent, Ever !!

[vistigioful]

@SGTMARSHALL1 I am not trying to be rude. But you have tried this and can say from experience that this increases power? I being open minded here. I am trying to build a fast bike and am looking for ideas. Be honest does this increase power?

[SGTMARSHALL1]

@vistigioful I am glad you asked, Yes I can honestly say that this system works from experience ! I bought two sets last year in June 2010 and combined the road version spider with the Mtn bike version to gain more power and now the company sells this combination. The forward weight creates centrifical force that builds with the increase of the cadence, the cranks natrually want to go faster and even though they are heavier they are not dead weight like the frame. sgt.marshall@live.com.au

[BrentShiver]

The way I see it you still have the bottom bracket spindle and both pedals in a line, so what would having curved arms do? NOTHING I think thats what we call a gimmick.

[SGTMARSHALL1]

@BrentShiver

There is no false avertising in this product, I have two sets, Road and MTB versions and my MTB is 18 kg and I am running 11-28t rear and 42-56t front and I have a spinal injury, they work because of the increased weight in front of the crank curve produces forward momentum helping the rotation, its not rocket science, but most people just like the sound of their un-educated opinion

[BrentShiver]

@SGTMARSHALL1 whatever dude its BS. Increased weight in front of crank curve? Bullcrap. The pedal threads, and bottom bracket spindle are in line, just like any other cranks. You expect me to think that a few grams of weight of the actual crank arm is going to make any noticeable difference in pedaling? And at a rate of 25% to boot? Thats rediculous. Maybe .000025% if you are lucky. But I wouldnt even buy that. Show me some proof of what you are saying and then Ill buy it.

[BrentShiver]

@BrentShiver Oh and one last thing. If you really wanted to increase pedal power its called upstroke and downstroke. Use clipless pedals and pull with one foot while pushing the other. Not this nonsense curved crank.

[SGTMARSHALL1]

@BrentShiver

I love the way idiots think, clipless pedal idea is really brilliant, you do all the work and I love LMAO at your type of riders, most riders cant even power 56t on the road, but I can use it on road/off-road and uphill. I had a rider pedal his guts out to catch me on his $10,000 road bike, by the time he caught up he was physically stuffed and I was just cruising. Enjoy your straight cranks with clipless pedals

[ZdenekJindra]

@SGTMARSHALL1 The front weight you are talking about gets compensated away by the opposite crank. It might increase the moment of inertia though.

[orolfstolle]

@SGTMARSHALL1 Your spinal injury is insecting your brain, Wankmaster Gaydog!

[fdhsdfjli9ew]

TOTAL BS

It does not matter what route the metal takes to get from the bottom bracket to the pedal, it still connects the two in the same way as a traditional crank arm.

If you grind the side of a standard crank arm so the arm takes the shape of a curve will it change the way it works? NO!

SCAM

[celine8168]

Maybe you should try first then comment. there are some road test data, really can increase the torque output. you can go to the website can see it Thanks

[nunayafb]

@celine8168 Your test must be faulty then, I am an engineer and can tell you that torque is Force X Distance (Dist from pedal centerline to crank centerline) and that the shape is irrelevant. In this case the force has two vectors tangential and radial, only the tangential force creates torque and is zero at 0 degrees (vertical) and maximum at 90 degrees (horizontal) for a vertically applied force.

[celine8168]

@nunayafb 

[celine8168]

@nunayafb 

[celine8168]

@nunayafb

[celine8168]

@celine8168

[celine8168]

@nunayafb 

[celine8168]

@nunayafb

[Crypt1cmyst1c]

@fdhsdfjli9ew i completely agree. the force isnt being moved, its only being stressed differently. your feet make the same movements, and impart the same amount of pressure.

[oliverdavidpatrick]

I don't see why this crank should be any improvement over traditional crank design - perhaps you can explain.

I am using the last Shimano DuraAce Octalink crank (9-speed chain) and this is my performance benchmark

[celine8168]

using "toe-out-on-turns"theory to let the power can advance of power .and the golden spiral shape design make the stess distribute in average. so can improvement. the website has the road test and the SGS test report and the concept of design you can see it.

[oliverdavidpatrick]

cool, I will have a look at it,

[celine8168]

Thanks ~