Yamaha RAPTOR YFM50RV Owner's Manual page 134

Transmission:
Primary reduction system
Primary reduction ratio
Secondary reduction system
Secondary reduction ratio
Operation
Gear ratio:
Chassis:
Frame type
Caster angle
Trail
Tire:
Type
Size : Front
: Rear
Manufacturer/type
Front
Rear
Model
Spur gear
65/20 (3.250)
Shaft drive
19/18 × 34/10 (3.588)
Left hand operation
38/14 (2.714)
Steel tube
1°
3.4 mm (0.13 in)
Tubeless
AT16 × 7-7
AT16 × 8-7
DUNLOP/KT145
DUNLOP/KT145
10-4
YFM50R