Yamaha YFM80WS Owner's Manual page 326

Model
Transmission:
Primary reduction system
Primary reduction ratio
Secondary reduction system
Secondary reduction ratio
Transmission type
Operation
Gear ratio:
1st
2nd
3rd
Chassis:
Frame type
Caster angle
Trail
Tire:
Type
Size: Front
: Rear
Manufacturer/type:
Front
Rear
Spur gear
65/20 (3.250)
Shaft drive
19/18 × 34/10 (3.588)
Constant mesh 3-speed
Left foot operation
39/11 (3.545)
35/17 (2.059)
31/22 (1.409)
Steel tube
1°
3.8 mm
Tubeless
AT18 × 7-7
AT18 × 8-7
DUNLOP/KT586
DUNLOP/KT587
10-4
YFM80W