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Discussion Starter #1
Does anyone know of an online final drive calculator, or the formula?

I just put a fresh tire on and noticed that Im missing a tooth from my front sprocket. It was a 19t Vortex, and my rear aluminum Vortex looks like crap on the teeth.
Im running a 18/37. What does that figure out to in mph @ 12500rpm?

What are some of you top speed racing guys doing for sprockets? I cant find anything worth messing with online.
Im looking to gear my bike alot taller, 210/215mph.
 

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Speed Freak
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12,730 Posts
Does anyone know of an online final drive calculator, or the formula?

I just put a fresh tire on and noticed that Im missing a tooth from my front sprocket. It was a 19t Vortex, and my rear aluminum Vortex looks like crap on the teeth.
Im running a 18/37. What does that figure out to in mph @ 12500rpm?

What are some of you top speed racing guys doing for sprockets? I cant find anything worth messing with online.
Im looking to gear my bike alot taller, 210/215mph.
the zx-10rs rev to 12,750

on a 190/50-17 the bikes stock go 186mph

for every front tooth you change if you go up or down 1 you will gain 9mph
for every rear tooth you change if you go up or down 1 you will gain 4mph

so you would be geared with a 18/37 you should be at 203mph
and at 19.37 you should be geared to 212mph


if you change tires from a 190/50 to a 180/55 you will gain roughly 2 mph and if you change from a 190/50 to a 190/55 you should gain about 4 mph.


All of these mph's are going to be a +/- 1mph or so.

I have messed with a bunch of gearing calculators but they are never accurate, go by the general guide lines above and you will be fine... 9mph for the front 4mph for the rear
 

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Discussion Starter #4
Thanks Garth, my speedo has never worked and I dont have a GPS.
I dont know why but it just never feels like Im going very fast.
Im looking at my dyno sheet and my bike only revs to 12500, think that could be hurting my top end speed.
Im ordering another 19t and going down one more in the rear.
Thank you Garth.
 
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