Fabrication of short cranks.

[100volts+]

In the future I might have to go to shorter crank arms. Because I have got an extended BB to clear the Battery box and fabricated swing arm I need to use 3 speed crankset and use only the smallest inside gear to keep a decent chain line and have the chain clear the swing arm as well. There are loads of short single cranks with short crank arms Problem is all the 3 speed crank sets i've have seen have crank arms of 170mm. They sell taps for pedal mount threads so I can take a 170 and make a 144mm if I have too. Has anyone seen a 3 speed short crank arm crank set?

 

[Russell]

This fellow specializes in shortening cranksets.

http://www.bikesmithdesign.com/Short_Cranks/

-R

 

[100volts+]

Thanks for the info but if it comes down to it I'll shorten the cranks myself,but i'd rather buy a manufactured short crank three speed crankset with about 144mm cranks.

 

[Russell]

There's a set of 145mm triple arms on eBay:


http://www.ebay.com/itm/orign8-triple-cranks-145mm-arm-set-/321504823953?pt=US_Cranksets&hash=item4adb2e4a91

-R

 

[John in CR]

I've shortened several myself. With steel cranks it's simple, because welding such thick steel is easy. It's just a matter of getting the holes the same distance.