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Motorized Bicycle General Discussion All topics regarding bicycles with engines.

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Old 03-25-2009, 09:00 PM
jonnypyro jonnypyro is offline
Motorized Bicycle Newbie
Join Date: Nov 2008
Location: massachusetts
Posts: 2
Default building RC truck with motor

hey guys i have a '80'cc bicycle motor and was told by the police that i need to have my license and register the bike. so since i had to get my license anyways i just decided to buy a street bike. Anyways now i have this motor and want to build a custom rc car chassis and mount it on. My question is, what size sprocket would i need to use in back? the front sprocket i beleive is 10 teeth, and the tires are 7".i want a decent top speed and good torque. Thanks guys
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Old 03-25-2009, 09:08 PM
ibcnya's Avatar
ibcnya ibcnya is offline
Motorized Bicycle Elite Member
Join Date: Oct 2008
Location: Concord NC
Posts: 220
Default Re: building RC truck with motor

I really dont think its gonna matter what sprocket you use on that project. the power to wiehgt ratio is gonna be so sick its gonna fly no matter what.
...ive gone to the scooter side, variators arent that bad.
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Old 03-25-2009, 10:33 PM
Speedy Wilson's Avatar
Speedy Wilson Speedy Wilson is offline
Motorized Bicycle Senior Member
Join Date: Mar 2009
Location: Ringgold,GA
Posts: 52
Default Re: building RC truck with motor

hey, i got a link to a speed calculator i use on a diy go kart site. It works for anything. For the "axle teeth" put the # of teeth on the rear sprocket....hope this helps

Speed Calculator For Go Karts and Mini Bikes

Last edited by Speedy Wilson; 03-25-2009 at 10:33 PM. Reason: forgot to paste link
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