6.4
9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
© Copyright Polaris Inc.
CHAINCASE SPROCKET RATIO SPEED CHART
The following gear and chain combinations are acceptable for use with the 7.063″ (179.4 mm) center distance
chaincase. MPH speed is the theoretical speed when the drive and driven clutches are at a 1:1 ratio.
NOTICE
Because the vehicle speed sensor obtains its pulse reading from the brake disc, changing the factory-specified gear
ratio (upper / lower sprockets) will result in the speedometer displaying inaccurate speeds.
Digital Wrench provides a special tool to allow technicians to enter the new upper and lower sprockets into the
software and then re-calibrate the speedometer offset.
If Digital Wrench is not used to re-calibrate the speedometer offset, the indicated vehicle speed will be incorrect on
the instrument clusters.
While the upper and lower sprocket values can be changed in Digital Wrench, no provision is made in the event a
larger or smaller diameter driveshaft is installed in the vehicle. Only the factory-installed driveshaft is used in the
speedometer offset logic.
IMPORTANT
Do not use upper / lower sprocket combinations that are not listed on the table. Non-recommended sprocket and
chain combinations may cause severe chaincase damage.
CHAINCASE SPROCKET RATIO SPEED CHART
7.063″ (179.4 MM) CHAINCASE
UPPER
SPROCKET
LOWER
SPROCKET
CHAIN LENGTH RATIO
THEORETICAL VEHICLE SPEED (MPH) AT 1:1 SHIFT
RATIO @ RPM
8050 8250 8450
26 37 70 1.42 121 124 127
26 38 70 1.46 118 121 124
24 36 68 1.50 115 118 121
25 38 70 1.52 113 116 119
25 39 70 1.56 111 113 116
23 36 68 1.57 110 113 116
26 41 72 1.58 109 112 115
23 37 68 1.61 107 110 113
26 42 72 1.62 107 109 112
24 39 70 1.62 106 109 111
24 40 70 1.67 103 106 109
22 37 68 1.68 103 105 108
25 42 72 1.68 103 105 108
22 38 68 1.73 100 102 105
23 40 70 1.74 99 102 104
24 43 72 1.79 96 99 101
20 36 66 1.80 96 98 101
21 38 68 1.81 95 98 100
22 41 70 1.86 93 95 97
19 36 66 1.89 91 93 96
23 44 72 1.91 90 92 95
20 39 68 1.95 88 91 93
21 42 70 2.00 86 88 90
FINAL DRIVE / BRAKE SYSTEMS
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