2015 - 2021
BETA RR 390
51t rear sprocket in red
| JT Sprockets
Fits to:
BETA RR-S 390 ENDURO 4T [2017 - 2019]
BETA RS 390 [2015 - 2016
BETA RR 390 ENDURO 4T EFI Racing [2017 - 2020]
BETA RR 390 EFI Racing [2017 - 2021]
BETA RR 390 ENDURO 4T [2015 - 2021]
BETA RR 390 ENDURO 4T EFI [2016 - 2019]
2020 - 2021 BETA RR 390
Transmision ratio:
| 11 | 12 | 13 | 14 | 15 | 16 | ||
| 38 | 3.45 -8.3% | 3.17 -16.0% | 2.92 -22.4% | 2.71 -28.0% | 2.53 -32.8% | 2.38 -37.0% | |
| 39 | 3.55 -5.9% | 3.25 -13.8% | 3.00 -20.4% | 2.79 -26.1% | 2.60 -31.0% | 2.44 -35.3% | |
| 40 | 3.64 -3.5% | 3.33 -11.6% | 3.08 -18.4% | 2.86 -24.2% | 2.67 -29.3% | 2.50 -33.7% | |
| 42 | 3.82 +1.3% | 3.50 -7.1% | 3.23 -14.3% | 3.00 -20.4% | 2.80 -25.7% | 2.62 -30.4% | |
| 43 | 3.91 +3.7% | 3.58 -4.9% | 3.31 -12.2% | 3.07 -18.5% | 2.87 -23.9% | 2.69 -28.7% | |
| 44 | 4.00 +6.1% | 3.67 -2.7% | 3.38 -10.2% | 3.14 -16.6% | 2.93 -22.2% | 2.75 -27.0% | |
| 45 | 4.09 +8.5% | 3.75 -0.5% | 3.46 -8.2% | 3.21 -14.7% | 3.00 -20.4% | 2.81 -25.4% | |
| 46 | 4.18 +10.9% | 3.83 +1.7% | 3.54 -6.1% | 3.29 -12.8% | 3.07 -18.6% | 2.88 -23.7% | |
| 47 | 4.27 +13.4% | 3.92 +3.9% | 3.62 -4.1% | 3.36 -10.9% | 3.13 -16.9% | 2.94 -22.1% | |
| 48 | 4.36 +15.8% | 4.00 +6.1% | 3.69 -2.0% | 3.43 -9.0% | 3.20 -15.1% | 3.00 -20.4% | |
| 49 | 4.45 +18.2% | 4.08 +8.3% | 3.77 standard | 3.50 -7.1% | 3.27 -13.3% | 3.06 -18.8% | |
| 50 | 4.55 +20.6% | 4.17 +10.5% | 3.85 +2.0% | 3.57 -5.2% | 3.33 -11.6% | 3.12 -17.1% | |
| 51 | 4.64 +23.0% | 4.25 +12.8% | 3.92 +4.1% | 3.64 -3.4% | 3.40 -9.8% | 3.19 -15.4% | |
| 52 | 4.73 +25.4% | 4.33 +15.0% | 4.00 +6.1% | 3.71 -1.5% | 3.47 -8.0% | 3.25 -13.8% | |
| 53 | 4.82 +27.8% | 4.42 +17.2% | 4.08 +8.2% | 3.79 +0.4% | 3.53 -6.3% | 3.31 -12.1% | |
| 54 | 4.91 +30.2% | 4.50 +19.4% | 4.15 +10.2% | 3.86 +2.3% | 3.60 -4.5% | 3.38 -10.5% | |
| 55 | 5.00 +32.7% | 4.58 +21.6% | 4.23 +12.2% | 3.93 +4.2% | 3.67 -2.7% | 3.44 -8.8% | |
Specifications
| Manufacturer | JT Sprockets |
|---|---|
| Chain pitch | 520 |
| Color | Red |
| Material | 7075-T6 Aluminum |
| Position | Rear |
| Number of teeth | 51 |
| Type | Rear |
| Units | Each |
Product description
Computer-designed to achieve ultimate strength at minimum weight JT combines leading-edge technology with top materials to produce the ultimate quality sprocket range with unbeatable value Every sprocket meets or exceeds the highest possible quality standards set for the motorcycle industry Sprockets are heat-treated and bead-blasted to reduce material surface tension