Gear Ratio Calculator

I put this together when I was wanting to figure out what gear ratio I would need to reach a certain speed. It is an Excel Spread sheet that asks for your tire and rim info, engine and transmission reductions as well as sprocket sizes. You then enter you RPM and it will give you the speed in MPH in each gear. I have found it to be very accurate. The default is what I used for my 2006 Yamaha YZ450. Any box with a black outline is the area you need to input your info. Red boxes are the results.

Hope this helps anyone in need of new sprockets!


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