JT Sprockets

Online Catalogue

Honda CRF100 F-4,5,6,7,8,9,A,B,C,D

2004 to 2013

Front Sprocket

Steel Front Sprocket

Part Number: JTF274

Teeth: 14

Available Sizes: 13, 14, 15

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR1204

Teeth: 50

Available Sizes: 46, 49, 50

Drive Chain

Pitch: 428

Length: 118

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 Sprocket463.54
-0.9%
3.29
-8.0%
3.07
-14.1%
493.77
+5.5%
3.50
-2.0%
3.27
-8.5%
503.85
+7.7%
3.57
standard
3.33
-6.7%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)