JT Sprockets

Online Catalogue

Honda CR85 R-5,6,7 >>> 428 Chain Conversion

2005 to 2007

Front Sprocket

Steel Front Sprocket

Part Number: JTF1257

Teeth: 15

Available Sizes: 14, 15

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR217

Teeth: 49

Available Sizes: 49, 50, 52, 55, 56

Aluminium Rear Race Sprocket

Part Number: JTA217

Teeth: 49

Available Sizes: 49, 50, 55, 56

Drive Chain

Pitch: 428

Length: 116

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
1415
Rear Sprocket493.50
+7.1%
3.27
standard
503.57
+9.3%
3.33
+2.0%
523.71
+13.7%
3.47
+6.1%
553.93
+20.3%
3.67
+12.2%
564.00
+22.4%
3.73
+14.3%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)