Elips to cylinder SOFABIKE NO hands START

I changed chain on a sofabike then after made some riding in Sant Andrew park.
Camera on Stick; HD-Pro-Hero
Stick; 1,9meters long
Camera in hands Sanyo-HD-1010

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[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

[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

[ChrisLuxembourg]

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

[sofabike]

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

please be specific.

Thank you for a coment

[saidaishyatei]

cool! how much?

[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

[bmxryder]

I dont understand why the inner sprocket is egg shaped