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)
Arctic Cat  
All Acrtic Cat Models 7.50"
Proclimb/Procross 10.16"
Polaris  
1996 & Older (F-500) 6.625"
1997-2001 GenII 7.05"
Pro, Rush, Indy & 13 up 7.53"
All Edge & 440 IQ Race Sleds 7.92"
2005 900 Fusion 11.35
2006-07 All Fusion & RMK 8.373"
2008-2012 IQ 8.373"
2013 Pro, Rush, & up 7.53"
2015 up AXYS RMK 7.764"
2015 up AXYS ProS/X 7.063"
Ski-Doo  
CK3 Chassis & REV 2003 6.85"
RT (175mm) 6.90"
F&S Chassis (180mm) 7.09"
ZX & 2004-05 REV 7.48"
RT Mach 7.97"
RT Summit 9.19"
REV XP 12.85"
All Yamaha Models  
All Models 7.00"
SR Viper 10.16"