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TI_Tuesday
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748 Posts
Discussion Starter · #1 ·
alrighty guys, i was told for more speed either go up in teeth on the front sprocket or less teeth on the rear. found a place that sells the front one for my bike but, it's only 1 tooth more. will that one tooth make any difference?
 

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how about some science to go with that?

divide the number of teeth on the rear sprocket by the number of teeth on the front sprocket, this will give you a number, your final drive ratio like a car.

eg. 51 tooth rear / 21 tooth front = 2.428 drive ratio

now you change the rear to a 48 (i did this for el diablo)

48 tooth rear / 21 tooth front = 2.285 drive ratio

now to scale speed or rpm's, (since everything else: tire size, transmission, primary drive have stayed constant) you just divide these numbers.

old speed * old ratio / new ratio = new speed

top speed was 110 mph, so 110 mph * (2.428/2.285) = 117 mph at the same rpm.

make sense?
brandon
 

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TI_Tuesday
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748 Posts
Discussion Starter · #9 ·
dude that rocks. thanks. i have a feeling we may be seeing ya.

stolenmojo said:
cool, you guys keep me posted on your smokeout trip. i live 30 minutes away from the epicenter and will offer any and all JJ's my garage and tools for fixes and whatnot.

brandon
 
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