Online Catalogue

KTM 250 MX

1989

Front Sprocket

Lightweight Self-Cleaning Front Sprocket

Part Number: JTF1901SC

Teeth: 13

Available Sizes: 13, 14, 15, 16

JTF1901SC is a Lightweight Self-Cleaning sprocket

Steel Front Sprocket

Part Number: JTF1901

Teeth: 13

Available Sizes: 11, 12, 13, 14, 15

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF1901RB

Teeth: 13

Available Sizes: 13, 14

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR896

Teeth: 52

Available Sizes: 45, 48, 50, 52

Racelite Aluminium Rear Race Sprocket

Part Number: JTA896BLK

Teeth: 52

Available Sizes: 48, 50, 52

Drive Chain

Pitch: 520

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

Teeth		Front Sprocket
Teeth		11	12	13	14	15
Rear Sprocket	52	4.73 +18.2%	4.33 +8.3%	4.00 standard	3.71 -7.1%	3.47 -13.3%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)