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Old 08-13-2010, 10:17 PM
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The_Aleman The_Aleman is offline
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Join Date: Jul 2008
Location: el People's Republik de Kalifornistan
Posts: 2,658
Default Re: How fast will a beach cruiser with 49cc 4 stroke motor go with a 155ib user on it

Stock engine with stock 44T gear on a 26x2.125" wheel, probably just under 30MPH. Every 2-stroke with stock gear I've had (all were 66cc) topped out under 30. The 49cc can rev a little higher tho. For every 1 tooth smaller rear gear, you gain about 1mph.

I ran a 34T on my first motored bicycle which gave it a top speed of ~38mph (could go faster if I wanted to overrev) and a great cruising speed of 28-30. YMMV.
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