Gear Ratio Charts
Formula To Calculate MPH:
RPM ÷ GR x SC ÷ 12 x 60 ÷ 5280 = MPH @ 1:1 Clutch Ratio

GR = Gear Ratio (divide top sprocket into bottom sprocket)
SC = Sprocket Circumference (number of teeth x track pitch)
7T - 2.52" Pitch = 17.64 SC
8T - 2.52" Pitch = 20.16 SC
9T - 2.52" Pitch = 22.68 SC
10T - 2.52" Pitch = 25.20 SC
7T Convolute - 3.29" Pitch = 23.03 SC
Formula to Calculate Chain:
CD x 2
--------
.375
+ TS + BS
----------
2
= Pitch
CD = Center Distance (Drive Shaft to Jackshaft Centers)
TS = Top Sprocket
BS = Bottom Sprocket
Round number up to even number for proper pitch
Center Distance (Drive Shaft to Jackshaft)
Model CD(inches)
All Arctic Cat Models 7.5
Polaris  
1996 & Older 6.625
1997-2001 GenII 7.05
2005 900s 11.35
2006-07 All Fusion & RMK 8.373
All Edge & 440 IQ Race Sleds 7.92
Ski-Doo  
CK3 Chassis & REV 2003 6.8504
ZX & 2004-05 REV 7.4803
RT Mach 7.9724
RT Summit 9.1929
REV XP 12.854
All Yamaha Models 7
 
 
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