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Old 02-23-2011, 03:02 AM
dtj6ppc dtj6ppc is offline
Motorized Bicycle Senior Member
Join Date: Feb 2011
Location: redondo
Posts: 61
Default Re: Optimum off-road-motor bike gear ratio?

Originally Posted by scotto- View Post
Hey there Don Redondo, welcome to the forum! It would help knowing what kind of gearbox you are running to determine what you're looking for gear ratio wise. Or are you trying to determine which type of gear box to use?

Please let us is on the way!

Side note......if you're running a 4-stroke engine, a 72 tooth rear sprocket comes too mind.
Hi Scotto,

Exactly, I am trying to figure out what combination of gear box, jack shaft gears, crank gear, and rear wheel gear that combined will give me a final drive ratio adequate enough to move 325 lbs up a maximum incline of 40 percent, using 1.6 horsepower, at 7,000 rpm, at say a minimum speed of 5 mph........................Don
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