Yamaha DT501988 Owner's Manual page 90

Model
DT50W
Clutch type:
Wet, multi-disc
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Transmission:
Primary reduction system Helical gear
Primary reducf1on ratio
68/19 (3.578)
Secondary reduction system
Chain drive
Secondary reduction ratio
48/13 (3.692)
Transmission type Constant meth 6-speed
Operation
Left foot operation
Gear ratio
1st 39/12 (3.250)
2nd
34/16 (2.125)
3rd
31/20 ( 1.550)
4th 27 /22 ( 1.227)
5th. 26/25 ( 1.040)
6th
24/26 (0.923)
Chassis:
Frame type Semi double cradle
Caster angle
28.33°
Trail
98 mm (3.86 in)
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Tire:
Type With tube
Size - Front
2.50-19 4PR
Rear 3.00-17 4PR
9-3