Prototype Trials rim-disc brake. The "RISC" Brake

[Alexlikesbikes]

I love it! You saw a problem and you found a solution!  If inteligence is the capacity to problem solve, then you sir, are a genius!

[manueldaman]

I think your idea is genius actually, although the weight might be a problem for some. That has got to feel really solid. I think the weight could be reduced in many ways, especially if the disc was closer to the rim and the attachment points on the inside rather than on the side walls. Plus, there are probably too many attachment points (compared with the usual 6 of a normal disc brake).

[MrGuusieB]

cool, but I'd rather have hs33. Discbrakes are just slow, and mag's arent. I like the rimgrind sound too. 2 reasons why I will be riding hs33. good try though!

[ARMekijker]

wow thats a huge brake:P I dont think its very usefull though, great idead, the companies nowadays dont do shit about brakes so well done m8:D and well its not very usefull cause it weighs a lot I guesse^^

[kiwifreeride]

'It weighs alot you guess'! It doesnt weigh much more than my magura setup with a booster now. Cheers

[ARMekijker]

hmmm well well done then it looks really sick if it works as good as ur telling, then I might do the same cause it really looks sick:)

[RonnieFukinSize]

As much as I like ingenuity and new ideas, I'd have to agree with elan. getting dirty, scraping the crap out of that on rocks, and then the whole bash the wheel and replace the rim.

[RonnieFukinSize]

That has to be the most ridiculous idea i've seen on 2 wheels. The negatives would far outweigh any benefits this system could produce. A magura with grind or tar is probably more effective and weighs a small fraction.

[kiwifreeride]

What are you basing your claims on? You have never ridden the bike, never seen the bike, you dont even know how much it weighs. Iv been using this for over a year now and im never going to go back to maguras. I do a tenth of maintenance you have to do on a magura. I went back for about a week when I had a leaking caliper and it was nothing compared to this brake.

[RonnieFukinSize]

What maintenance on maguras? Change the pads once in a blue moon. I base my claim on common physics. I have seen the bike coz it's in your video (duh) and the it looks to ride very heavy. The benefit of using a disk brake is that it's close 2 the hub, thus reducing the risk of submersion on riding river sections and damage on riding rock sections. Take a look at the materials used. Its all metal, it doesn't take a genius to work out the extra weight. And in biketrial every gram counts. Nice idea

[RonnieFukinSize]

What happens when the rim colapses on a huge drop? The force of landing transmits through the rotor thats what. Which will add up to a totalled brake. The braking systems on trials bikes have been steadily improved for decades. Up till the point we are at now. I think the set up most pro riders use is sufficient for the job at hand. The power and weight of current products means its virtually impossible to manufacture something equal or better.

[kiwifreeride]

What happens when the rim colapses on a huge drop? Well then you are screwed arnt you? Im not a fat basted so I dont collapse my rims. Iv done a couple of 3m drops and the rim didnt collapse. (bent my cranks)

The braking systems on trials bikes have been steadily improved for decades There hasnt been ANY development up until a few years ago with echo brakes. Obviously there has been development by individual people but not companies. Magura dont develop their brake for trials.

[tartybikeslewis]

i think the risc is the brake ill stick with my rear mag and front hope

[Themechanicalbear]

Very ingeneous but why?

[acidjzaz]

hey who is playing on the soundtrack for this?

[Buledde]

should be a very heat resistant brake.

[niefankaz]

Ok thanks!

Another quick question: how heavy is this compared to "classical" disc brakes for example?

[kiwifreeride]

Have a look on the observedtrials. net forums. Theres a bunch of stuff on it. It weighs 940 grams but is only a prototype so i think the weight could be taken down to 500gram no problem.

[niefankaz]

Oh thanks. That's for sure easier to understand with all the explanations ;)

[niefankaz]

Very impressive and very interesting work.

Why did you put the caliper so high, on tip of this big arm?

[kiwifreeride]

The arm is floating to accommodate for wheel alignment and flex when you land.

[luckythirteen77]

As much as I like ingenuity and new ideas, I'd have to agree with elan. getting dirty, scraping the crap out of that on rocks, and then the whole bash the wheel and replace the rim.

If it's easy to install, then no biggy I guess.

[elancares]

too much risk of bent rim

[kiwifreeride]

Bend it on what? Its on the rim so a rock will tend to scrape past it. You are way way more likely to hit a hub mounted disc on a rock since its sticking out about 2 inches. Also the disc is made from segments so the whole disc doesnt need to be replaced.