Online Catalogue

Honda CRF450 L-M

2021

Front Sprocket

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF1345RB

Teeth: 13

Available Sizes: 13

Rear Sprocket

Lightweight Self-Cleaning Rear Sprocket

Part Number: JTR210SC

Teeth: 51

Available Sizes: 45, 47, 48, 49, 50, 51, 52, 53

Steel Rear Sprocket

Part Number: JTR210

Teeth: 51 Check Availability

Available Sizes: 38, 39, 40, 42, 43, 44, 46, 55

Racelite Aluminium Rear Race Sprocket

Part Number: JTA210BLK

Teeth: 51

Available Sizes: 40, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54

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		13
Rear Sprocket	38	2.92 -25.5%
	39	3.00 -23.5%
	40	3.08 -21.6%
	42	3.23 -17.6%
	43	3.31 -15.7%
	44	3.38 -13.7%
	46	3.54 -9.8%
	51	3.92 standard
	55	4.23 +7.8%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)