in Plymouth, United Kingdom - photo by chazdog

rough mock up to make sure the principle works i amde today. main aims, rearwards axle path, really low standover, and really low centre of gravity. idler pulley not on there yet, and it wont look exactly like this as its got to be makeable.

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chazdog

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Album: frame-design
Category: Bikes - DH
Date Posted: Apr 30, 2011 at 13:36
Apr 30, 2011
Location: Plymouth, United Kingdom

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10 Comments

madm3chanic (Apr 30, 2011 at 17:14)

thats a 20 pounder right there bro...how are you planning on stopping that top link from inverting and rotating clockwise instead of counterclockwise?
and how/where you gonna get gears for the shock? kinda odd choice but i like how you could vary the shock ratio just by changing gears.

chazdog (Apr 30, 2011 at 18:16)

standard gear sized, milled out for bearings and linkage fitting. The shock stroke should limit the movement of the upper link. Am currently toying with high single pivot versions to make idler pulley versions easier too. will see how it goes, but running the model in solidworks has shown no inversion issues on the top link, it follows the same path as the bottom one

Its not gonna be light, but hopefully around 15lbs maximum

nouser (May 3, 2011 at 16:17)

Chaz just thinking a little and on your gears dont make them complete circles. They would not have to rotate a complete 360. Make the last teeth on each side large so that they cant possible rotate the wrong direction

chazdog (May 3, 2011 at 17:17)

well atm i was intending to machine existing gears to fit, and when they wore down, you could rotate then 180 degrees as the other side would not be worn, doubling the lifespan. They cant over rotate, the shock limits the movement.

Russell1994 (Apr 30, 2011 at 13:45)

Looks like a brooklyn.... which means I love this design

... anything that reminds me of one is a winner!

chazdog (Apr 30, 2011 at 13:48)

lol, i'll take that as i love brooklyn too

iceman8 (Apr 30, 2011 at 14:30)

Looks rad, have you run the pivot placements etc through linkage? Looks like it could be quite rear heavy though?

chazdog (Apr 30, 2011 at 14:33)

not yet, but done it all down on papr, with axle paths etc and it all works. Rear triangle was done in a rush, currently working on the proper one, will be skinny diameter steel in reality with chunky alloy links. so not too bad

frdh (Apr 30, 2011 at 16:23)

looks more like a canfield, and works the same way too.

www.bikeaddict.com/bikes/images/fattyfatleft.jpg

chazdog (Apr 30, 2011 at 18:20)

canfield is the inspiration, just with a neater front triangle and lower shock placement. love canfield