Online Catalogue
KTM 990 Duke
2024
Front Sprocket
Rear Sprocket
Steel Rear Sprocket
Lightweight Self-Cleaning Rear Sprocket
Racelite Aluminium Rear Race Sprocket
Part Number: JTA897BLK
Teeth: 43 Check Availability
Available Sizes: 38, 40, 41, 42, 45, 47, 48, 49, 50, 51, 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 | ||||||
| 12 | 13 | 14 | 15 | 16 | 17 | ||
| Rear Sprocket | 40 | 3.33 +24.0% | 3.08 +14.5% | 2.86 +6.3% | 2.67 -0.8% | 2.50 -7.0% | 2.35 -12.4% |
| 42 | 3.50 +30.2% | 3.23 +20.2% | 3.00 +11.6% | 2.80 +4.2% | 2.62 -2.3% | 2.47 -8.1% | |
| 43 | 3.58 +33.3% | 3.31 +23.1% | 3.07 +14.3% | 2.87 +6.7% | 2.69 standard | 2.53 -5.9% | |
| 45 | 3.75 +39.5% | 3.46 +28.8% | 3.21 +19.6% | 3.00 +11.6% | 2.81 +4.7% | 2.65 -1.5% | |
| 48 | 4.00 +48.8% | 3.69 +37.4% | 3.43 +27.6% | 3.20 +19.1% | 3.00 +11.6% | 2.82 +5.1% | |
| 49 | 4.08 +51.9% | 3.77 +40.3% | 3.50 +30.2% | 3.27 +21.6% | 3.06 +14.0% | 2.88 +7.3% | |
| 50 | 4.17 +55.0% | 3.85 +43.1% | 3.57 +32.9% | 3.33 +24.0% | 3.12 +16.3% | 2.94 +9.4% | |
| 51 | 4.25 +58.1% | 3.92 +46.0% | 3.64 +35.5% | 3.40 +26.5% | 3.19 +18.6% | 3.00 +11.6% | |
| 52 | 4.33 +61.2% | 4.00 +48.8% | 3.71 +38.2% | 3.47 +29.0% | 3.25 +20.9% | 3.06 +13.8% | |
Lower gear ratios allow for higher top speeds.
Higher gear ratios increase torque for better acceleration.