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

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.

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Its not how fast you can go, its how fast you can stop that matters....

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