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Old 06-30-2013, 07:06 AM   #3
laramie LC4
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Joined: Sep 2004
Location: Tucson, Az
Oddometer: 2,333
yup 16/42 is the stock ratio on the 990R. divide 42/16 = 2.625, 45/17 = 2.647, 45/15 = 3.0 and so on....the lower the number, the taller your gearing.

i have no idea how your smaller tires will affect/change the ratio but i'm sure a little google work will get you a formula.

laters,

laramie
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'12 LC8 990R, '02 LC4 640, '05 WR 450f (part-out), '98 XR400R, '76 KE100, '05 525 (Step-Child)
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