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Old 09-12-2011, 06:02 PM
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Gbrebes Gbrebes is offline
Motorized Bicycle Elite Member
Join Date: Jul 2010
Location: Los angeles
Posts: 524
Default Re: Custom Frame For Thumper Motor

I found it here. In the first blue box under the picture of the drive pulley it states "engagement range: 1200 rpm - 3100 rpm. It also states that you can adjust the spring for driving in more hilly terrain.
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