JT Sprockets

Online Catalogue

Yamaha TY125

1989

Front Sprocket

Steel Front Sprocket

Part Number: JTF416

Teeth: 13

Available Sizes: 13, 14, 15

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR1842

Teeth: 52

Available Sizes: 37, 42, 44, 45, 47, 49, 50, 51, 52, 54, 55

Drive Chain

Pitch: 428

Length: 120

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
131415
Rear Sprocket372.85
-28.8%
2.64
-33.9%
2.47
-38.3%
423.23
-19.2%
3.00
-25.0%
2.80
-30.0%
443.38
-15.4%
3.14
-21.4%
2.93
-26.7%
453.46
-13.5%
3.21
-19.6%
3.00
-25.0%
473.62
-9.6%
3.36
-16.1%
3.13
-21.7%
493.77
-5.8%
3.50
-12.5%
3.27
-18.3%
503.85
-3.8%
3.57
-10.7%
3.33
-16.7%
513.92
-1.9%
3.64
-8.9%
3.40
-15.0%
524.00
standard
3.71
-7.1%
3.47
-13.3%
544.15
+3.8%
3.86
-3.6%
3.60
-10.0%
554.23
+5.8%
3.93
-1.8%
3.67
-8.3%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)