JT Sprockets

Online Catalogue

Yamaha TDR125 (3XD)

1989 to 1992

Front Sprocket

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF558RB

Teeth: 16

Available Sizes: 16

Steel Front Sprocket

Part Number: JTF558

Teeth: 16

Available Sizes: 13, 14, 15, 16, 17, 18, 20

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR839

Teeth: 53

Available Sizes: 51, 52, 53, 55, 57

Drive Chain

Pitch: 428

Length: 136

Please note that the chain shown in this listing is for size reference only. For the correct chain type and grade, please refer to the vehicle's manufacturer manual.

Gear Ratio Chart

TeethFront Sprocket
13141516171820
Rear Sprocket534.08
+23.1%
3.79
+14.3%
3.53
+6.7%
3.31
standard
3.12
-5.9%
2.94
-11.1%
2.65
-20.0%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)