Elips to cylinder SOFABIKE NO hands START

[HPVmarco]

ciao Sofabike.

on your very interesting MBB FWD bent, I didn't see a front derailleur. is it just hard to see in the video or did you use a special system for chainwheel shifting?

[sofabike]

@HPVmarco it does not has Front Derailleur.

A chain is very short. I do always take out of a new chain 4links, event with big chain-wheels. Eliptic=60, Cylindric=74. Ellips alowed to move chane into cylined using turning pedals back. In my configuration I do have practicaly only 8-Speeds (gears).

Theoreticaly ; on a wheel it has 6-cranks and on pedals 2-chain-wheels.

So, math looks like 6x2=12 Speed.

In real life eliptic works on 4 left side big cranks, cylindric on 4 rigt's smaller.

[HPVmarco]

@sofabike the 8 gears thing is clear.

but I've never seen this way of shifting chainwheels. you say it shifts just by turning the pedals backwards, but your video at 1:27 clearly shows the chain shifting from elliptical chainwheel to circular chainwheel while you're pedalling forward. how does that work?

[sofabike]

@HPVmarco Yes yours note is right, when shifting from eliptic (60t) chainwheel to cylindric chain go's by it self. Secret = axel of pedals botom-bracket on in paralel with wheel axel. To shift back into cylindric I have to turn pedals backwards.

This solution of "none-derailleur" I found by mistake on one of my first prototipe in 1988year. Then later use it on a Sofabike

[saidaishyatei]

cool! how much?

[sofabike]

@saidaishyatei*** How Much*** is what?

please be specific.

Thank you for a coment

[bmxryder]

I dont understand why the inner sprocket is egg shaped

[sofabike]

@bmxryder Elliptical chainwheels or elliptical chainrings, or ovoid rings or whatever you like to call them have been in and out of vogue every decade or so for more than a 100 years. They come into vogue because of the logic of taking advantage of the extra leverage the crank has half way through the stroke and they go out of vogue because they just don't catch on. Results are inconsistent between riders and machines

[ChrisLuxembourg]

@bmxryder In every part is the lever rule! Googe for BIOPACE

[sofabike]

@ChrisLuxembourg I Got it from Yours directon;Biopace is a tradename for a type of ovoid bicycle chain ring manufactured by Shimano from 1983 to 1993[1] The design was intended to help overcome the "dead zone" where the crank arms are vertical and riders have little mechanical advantage. [2]

Originaly I did have references in 1990year to USA patent of 1965y

[unfretted1]

Really like your bike, looks very comfortable to ride. I live in British Columbia where we have more hills than flat land! so..... I was wondering how does your bike handle going up hills? Thanks for these videos!

[sofabike]

@unfretted1 Please watch a video named;

"# 1 across a bridge West with 2 tanks on Sofabike"

It was loaded with heavy load.

thnks for coment

[MaciejDlugosz]

@unfretted1

I own Flevo-Racer and that's almost the same type of bike (MBB recumbent) as shown on the video. It's very annoying to start going uphill with a MBB bicycle. Why? Becaue you have to hard counter-steer when you push pedals from a "dead-stop". The whole bike MBB starting uphill tries to turn. If you make second stroke with pedals it goes to the another side. Annoying thing. I advice mounting spring on the front section to minimize this effect or I adding two wheels at the rear.

[sofabike]

@MaciejDlugosz on a FWD recumbent you have to steer with legs.

Yes I did made on some modifications of my FWDs rubber or still spring to hold front fork strait.

I foud it needed this spring only for a parking positon for a ticycles. Also spring helps beginers to make "right" pedaling on FWD.

I may say sometime I do use steering by hands, specialy going down-hills to make my legs relax while not pedaling.

Thnx 4 Coment

[MaciejDlugosz]

@sofabike

I completely agree with You @Sofabike. Personally I love MBB stering - it gives my hands completely freedom! I type very often messages on full keyboard with both hands on my GSM phone. But the thing about starting going uphill needs attention. Spring/ piece of rubber is more than necessary. Otherwise most people will hate FWD MBB recumbents. But FWD MBB are exclusively simple and afficient constructions. That's why we love them. And we should able to make them even better.

[sofabike]

Я давно хотель заменить цепь на клиновый ремень.

Клино ременную передачу. На мотоциклах такие давно используют.

Перекличетель скоростей изпользовать стандартный внутри втулки заднего колеса. Вело цепь это постоянная грязь.

Ваше мнение ?

[PetyPEN]

@sofabike Мысль правильная. Но у цепи выше КПД.

[sofabike]

@PetyPEN Thank You for a coment.

Spasibo za komentar

[lucio53]

no hands !

well done.

[sofabike]

@lucio53 Oh, thnx Lucio.

The hardest is to cary camera on long stick,

or 2 SCUBAs tanks across a bridge

[MW2Failure]

Thanks for confirming the language and also for answering what REMS I had always been curious about that since it is on almost all your gear including your freediving gear

[sofabike]

@MW2Failure in March1994 I was a sailor on a small boat.

We where in Danish port Koge. Sofabike was with me for riding around.

Director of REMS Danmark A/S deliver to our boat shipment to Lithuania.

He got very curioce about sofabike. I've told him a story of my rides in Denmark.

For a summer of 1994y director of REMS offered me to race "under REMS flag"

After sumer race I left sofabike in DK. In winter95 I made sofabike2.

You may see two sofabikes in one of my videos.

Sumer2008 REMS got

[sofabike]

@MW2Failure Summer 2008 I was in Denmark again.

REMS company made me a nice presen a Monofin.

You may see my swimming with monofin here and on another u2be chanel too.

In June 2009 I opened another u2be account with a login-name DEEPSWIM dedicated only to swimming underwater

[MW2Failure]

@sofabike Yup I know about deepswim, but you just answered my next question I was going to ask you :D but thanks for the summarized background of how you became partners with them

[sofabike]

@MW2Failure The main idea of this vid is; to show how eliptic chain-wheel works.

I made about same video few weeks ago, with old cranchee-noise chain.

Som of my russians-friends criticaly respond on chain-nose.

I change a chain and made this video. :-)

[MW2Failure]

P.S. What up with the REMS on almost ALL your gear

[sofabike]

@MW2Failure REMS is my Danish sponser.

In a mean time we (me and REMS) have 2 Sofabike's.

N*1 is with me in USA (I made it in 1991y)

N*2 belonges to REMS and located in Denmark (Imade it in 1994/95)

[MW2Failure]

Ahhh! The e-cursed language you speaking that sounds like Russian!!! The language I cannot understand lol!

[sofabike]

@MW2Failure Yes it is russian;)

basicaly it is describtions whay and how and with what tools I am changing chain.

I made briff subtitles in English