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Old 11-05-2008, 10:29 AM
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HoughMade HoughMade is offline
Motorized Bicycle Elite Member
Join Date: Apr 2008
Location: Valparaiso, IN
Posts: 624
Default Re: Your opinion on top speed/RPMs

You have not figured in how much horsepower it takes to move this combination at speed. If you do not include that, you can gear the up far enough that, theoretically, 1 hp would result in 300 mph- but we all know that will not happen. There is more to it that gearing. Why don't bicycles have 80 tooth front sprockets with 12 tooth rear so we can all pedal at highway speeds? To defeat all the forces, wind, friction, gravity, etc.- you will need closer to 5 hp to get to 50 mph.

With 2.5hp, you can get around 40 mph with proper gearing, but not much more no matter what ratios you plug in. There is just not enough power to get the engine to spin fast enough to get close to 50 mph.
29/10ths cubic inches of raw power.
HoughMade at

Last edited by HoughMade; 11-05-2008 at 10:32 AM.
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