Yamaha XTZ 125K Owner's Manual page 94

MODEL
Transmission:
Primary reducion system
Primary reduction rate
Secondary reduction system
Secondary reduction rate
Transmission type
Operatíon
Gear ratio 1st
2nd
3rd
4th
5th
Chassis:
Frame type
Caster angle
Trail
Tire:
Type
Size:
Front
Rear
Spur gear
68 / 20
Chain drive
48 / 14
Constant mesh 5-speed
Left foot operation
37 / 14
32 / 18
25 / 19
23 / 22
21 / 24
Diamond
26° 20'
106 mm (4,2 in)
With tube
80 / 90-21 48T
110 / 80-18 58T
8-3
XTZ 125E and XTZ 125K