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Old 08-23-2010, 05:50 AM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
Posts: 11,531
Default Re: A new shift concept for the engineers....

It is done by having two separate sets of pulleys and two belts. A simple rocker mechanism tensions one set (lower gear) then when you move the shift lever halfway both belts are loose, then when you pull the lever all the way it tensions the other set (higher gears). It was seen on a lot of mini bikes and go karts in the 40-60 in Popular Mechanic, ect.
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