Online Catalogue
KTM 300 SX Motocross
2025
Front Sprocket
Lightweight Self-Cleaning Front Sprocket
Rear Sprocket
Lightweight Self-Cleaning Rear Sprocket
Part Number: JTR897SC
Teeth: 47 Check Availability
Available Sizes: 40, 42, 43, 45, 48, 49, 50, 51, 52
Steel Rear Sprocket
Racelite Aluminium Rear Race Sprocket
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
| Teeth | Front Sprocket | |||||
| 11 | 12 | 13 | 14 | 15 | ||
| Rear Sprocket | 38 | 3.45 +2.9% | 3.17 -5.7% | 2.92 -12.9% | 2.71 -19.1% | 2.53 -24.5% |
| 40 | 3.64 +8.3% | 3.33 -0.7% | 3.08 -8.3% | 2.86 -14.9% | 2.67 -20.6% | |
| 41 | 3.73 +11.0% | 3.42 +1.8% | 3.15 -6.1% | 2.93 -12.8% | 2.73 -18.6% | |
| 42 | 3.82 +13.7% | 3.50 +4.3% | 3.23 -3.8% | 3.00 -10.6% | 2.80 -16.6% | |
| 43 | 3.91 +16.4% | 3.58 +6.7% | 3.31 -1.5% | 3.07 -8.5% | 2.87 -14.6% | |
| 44 | 4.00 +19.1% | 3.67 +9.2% | 3.38 +0.8% | 3.14 -6.4% | 2.93 -12.6% | |
| 45 | 4.09 +21.9% | 3.75 +11.7% | 3.46 +3.1% | 3.21 -4.3% | 3.00 -10.6% | |
| 46 | 4.18 +24.6% | 3.83 +14.2% | 3.54 +5.4% | 3.29 -2.1% | 3.07 -8.7% | |
| 47 | 4.27 +27.3% | 3.92 +16.7% | 3.62 +7.7% | 3.36 standard | 3.13 -6.7% | |
| 49 | 4.45 +32.7% | 4.08 +21.6% | 3.77 +12.3% | 3.50 +4.3% | 3.27 -2.7% | |
| 50 | 4.55 +35.4% | 4.17 +24.1% | 3.85 +14.6% | 3.57 +6.4% | 3.33 -0.7% | |
| 52 | 4.73 +40.8% | 4.33 +29.1% | 4.00 +19.1% | 3.71 +10.6% | 3.47 +3.3% | |
| 53 | 4.82 +43.5% | 4.42 +31.6% | 4.08 +21.4% | 3.79 +12.8% | 3.53 +5.2% | |
Lower gear ratios allow for higher top speeds.
Higher gear ratios increase torque for better acceleration.
JTF1901SC is a Lightweight Self-Cleaning sprocket