JT Sprockets

Online Catalogue

Honda CRF450 RX-L — USA

2020

Front Sprocket

Lightweight Self-Cleaning Front Sprocket

Part Number: JTF284SC

Teeth: 13

Available Sizes: 13, 14

Steel Front Sprocket

Part Number: JTF284

Teeth: 13

Available Sizes: 12, 13, 14, 15

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR210

Teeth: 49

Available Sizes: 38, 39, 40, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 55

Aluminium Rear Race Sprocket

Part Number: JTA210

Teeth: 49

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

Drive Chain

Pitch: 520

Length:

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
12131415
Rear Sprocket383.17
-16.0%
2.92
-22.4%
2.71
-28.0%
2.53
-32.8%
393.25
-13.8%
3.00
-20.4%
2.79
-26.1%
2.60
-31.0%
403.33
-11.6%
3.08
-18.4%
2.86
-24.2%
2.67
-29.3%
423.50
-7.1%
3.23
-14.3%
3.00
-20.4%
2.80
-25.7%
433.58
-4.9%
3.31
-12.2%
3.07
-18.5%
2.87
-23.9%
443.67
-2.7%
3.38
-10.2%
3.14
-16.6%
2.93
-22.2%
453.75
-0.5%
3.46
-8.2%
3.21
-14.7%
3.00
-20.4%
463.83
+1.7%
3.54
-6.1%
3.29
-12.8%
3.07
-18.6%
473.92
+3.9%
3.62
-4.1%
3.36
-10.9%
3.13
-16.9%
484.00
+6.1%
3.69
-2.0%
3.43
-9.0%
3.20
-15.1%
494.08
+8.3%
3.77
standard
3.50
-7.1%
3.27
-13.3%
504.17
+10.5%
3.85
+2.0%
3.57
-5.2%
3.33
-11.6%
514.25
+12.8%
3.92
+4.1%
3.64
-3.4%
3.40
-9.8%
524.33
+15.0%
4.00
+6.1%
3.71
-1.5%
3.47
-8.0%
534.42
+17.2%
4.08
+8.2%
3.79
+0.4%
3.53
-6.3%
554.58
+21.6%
4.23
+12.2%
3.93
+4.2%
3.67
-2.7%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)