Polaris Sportsman 6x6 Owner's Manual page 102

MAINTENANCE AND LUBRICATION
Adjustments
Rear Axle Drive Chain Adjustment
All procedures used in adjusting the front chain apply to the rear chain
adjustment. Total slack for the rear chain, however, should be adjusted
to 1/4"-1/2" (.6-1.3 cm).
99
3/16"-3/8"
(.48 cm - .95 cm)
1/4"-1/2" (.6-1.3 cm)