JT Sprockets

Online Catalogue

KTM 390 RC R

2018

Front Sprocket

Steel Front Sprocket

Part Number: JTF1908

Teeth: 15

Available Sizes: 14, 15

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF1908RB

Teeth: 15

Available Sizes: 15

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR890

Teeth: 45

Available Sizes: 42, 45

Drive Chain

Pitch: 520

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
1415
Rear Sprocket423.00
standard
2.80
-6.7%
453.21
+7.1%
3.00
standard

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)