JT Sprockets

Online Catalogue

Yamaha DT125 LC — France

1988

Front Sprocket

Steel Front Sprocket

Part Number: JTF264

Teeth: 16

Available Sizes: 14, 15, 16, 17

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR843

Teeth: 50

Available Sizes: 39, 45, 46, 47, 48, 49, 50, 51, 53, 54

Drive Chain

Pitch: 428

Length: 130

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
14151617
Rear Sprocket392.79
-10.9%
2.60
-16.8%
2.44
-22.0%
2.29
-26.6%
453.21
+2.9%
3.00
-4.0%
2.81
-10.0%
2.65
-15.3%
463.29
+5.1%
3.07
-1.9%
2.88
-8.0%
2.71
-13.4%
473.36
+7.4%
3.13
+0.3%
2.94
-6.0%
2.76
-11.5%
483.43
+9.7%
3.20
+2.4%
3.00
-4.0%
2.82
-9.6%
493.50
+12.0%
3.27
+4.5%
3.06
-2.0%
2.88
-7.8%
503.57
+14.3%
3.33
+6.7%
3.12
standard
2.94
-5.9%
513.64
+16.6%
3.40
+8.8%
3.19
+2.0%
3.00
-4.0%
533.79
+21.1%
3.53
+13.1%
3.31
+6.0%
3.12
-0.2%
543.86
+23.4%
3.60
+15.2%
3.38
+8.0%
3.18
+1.6%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)