JT Sprockets

Online Catalogue

Honda CM250 CD Belt Drive Conversion

1983

Front Sprocket

Steel Front Sprocket

Part Number: JTF287

Teeth: 14

Available Sizes: 13, 14, 15

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR279

Teeth: 38

Available Sizes: 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 42

Drive Chain

Pitch: 520

Length: 110

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 Sprocket302.31
-15.0%
2.14
-21.1%
2.00
-26.3%
312.38
-12.1%
2.21
-18.4%
2.07
-23.9%
322.46
-9.3%
2.29
-15.8%
2.13
-21.4%
332.54
-6.5%
2.36
-13.2%
2.20
-18.9%
352.69
-0.8%
2.50
-7.9%
2.33
-14.0%
362.77
+2.0%
2.57
-5.3%
2.40
-11.6%
372.85
+4.9%
2.64
-2.6%
2.47
-9.1%
382.92
+7.7%
2.71
standard
2.53
-6.7%
393.00
+10.5%
2.79
+2.6%
2.60
-4.2%
403.08
+13.4%
2.86
+5.3%
2.67
-1.8%
413.15
+16.2%
2.93
+7.9%
2.73
+0.7%
423.23
+19.0%
3.00
+10.5%
2.80
+3.2%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)