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Part Description
Derbi GPR 125 Nude (Radial Caliper) 05 Sprocket Rear - Pattern
50 Teeth
Delivery and Returns
We want you to be happy with your purchase. If you're not, just return the products to our warehouse. Unless faulty, we'd like this to be within 30 days of purchase. Exceptions apply to certain products.
In theory, increasing the number of teeth on the front sprocket and/or decreasing the number of teeth on the rear sprocket will result in you achieving a higher top speed, lower acceleration and better fuel economy. And vice versa: decreasing the number of teeth on the front sprocket and/or increasing the number of teeth on the rear sprocket will result in lower top speed, higher acceleration and worse fuel economy.
However, whilst generally true, in practice, this is always the case - mostly due to the power output of the machine at certain revs being higher or lower than at others. So, use the following table as a guide only. To achieve your desired results will often involve some trial and error.
It should also be noted that some models cannot accommodate larger front sprockets. Check before ordering. Often, the fitting of larger sprockets may require a longer chain. Check this too before ordering.
| FRONT | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| R E A R |
10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | |
| 30 | 3.00 | 2.73 | 2.50 | 2.31 | 2.14 | 2.00 | 1.88 | 1.76 | 1.67 | 1.58 | |
| 31 | 3.10 | 2.82 | 2.58 | 2.38 | 2.21 | 2.07 | 1.94 | 1.82 | 1.72 | 1.63 | |
| 32 | 3.20 | 2.91 | 2.67 | 2.46 | 2.29 | 2.13 | 2.00 | 1.88 | 1.78 | 1.68 | |
| 33 | 3.30 | 3.00 | 2.75 | 2.54 | 2.36 | 2.20 | 2.06 | 1.94 | 1.83 | 1.74 | |
| 34 | 3.40 | 3.09 | 2.83 | 2.62 | 2.43 | 2.27 | 2.13 | 2.00 | 1.89 | 1.79 | |
| 35 | 3.50 | 3.18 | 2.92 | 2.69 | 2.50 | 2.33 | 2.19 | 2.06 | 1.94 | 1.84 | |
| 36 | 3.60 | 3.27 | 3.00 | 2.77 | 2.57 | 2.40 | 2.25 | 2.12 | 2.00 | 1.89 | |
| 37 | 3.70 | 3.36 | 3.08 | 2.85 | 2.64 | 2.47 | 2.31 | 2.18 | 2.06 | 1.95 | |
| 38 | 3.80 | 3.45 | 3.17 | 2.92 | 2.71 | 2.53 | 2.38 | 2.24 | 2.11 | 2.00 | |
| 39 | 3.90 | 3.55 | 3.25 | 3.00 | 2.79 | 2.60 | 2.44 | 2.29 | 2.17 | 2.05 | |
| 40 | 4.00 | 3.64 | 3.33 | 3.08 | 2.86 | 2.67 | 2.50 | 2.35 | 2.22 | 2.11 | |
| 41 | 4.10 | 3.73 | 3.42 | 3.15 | 2.93 | 2.73 | 2.56 | 2.41 | 2.28 | 2.16 | |
| 42 | 4.20 | 3.82 | 3.50 | 3.23 | 3.00 | 2.80 | 2.63 | 2.47 | 2.33 | 2.21 | |
| 43 | 4.30 | 3.91 | 3.58 | 3.31 | 3.07 | 2.87 | 2.69 | 2.53 | 2.39 | 2.26 | |
| 44 | 4.40 | 4.00 | 3.67 | 3.38 | 3.14 | 2.93 | 2.75 | 2.59 | 2.44 | 2.32 | |
| 45 | 4.50 | 4.09 | 3.75 | 3.46 | 3.21 | 3.00 | 2.81 | 2.65 | 2.50 | 2.37 | |
| 46 | 4.60 | 4.18 | 3.85 | 3.54 | 3.29 | 3.07 | 2.88 | 2.71 | 2.56 | 2.42 | |
| 47 | 4.70 | 4.27 | 3.92 | 3.62 | 3.36 | 3.13 | 2.94 | 2.76 | 2.61 | 2.47 | |
| 48 | 4.80 | 4.36 | 4.00 | 3.69 | 3.43 | 3.20 | 3.00 | 2.82 | 2.67 | 2.53 | |
| 49 | 4.90 | 4.45 | 4.08 | 3.77 | 3.50 | 3.27 | 3.06 | 2.88 | 2.72 | 2.58 | |
| 50 | 5.00 | 4.55 | 4.17 | 3.85 | 3.57 | 3.33 | 3.13 | 2.94 | 2.78 | 2.63 | |
| 51 | 5.10 | 4.64 | 4.25 | 3.92 | 3.64 | 3.40 | 3.19 | 3.00 | 2.83 | 2.68 | |
| 52 | 5.20 | 4.73 | 4.33 | 4.00 | 3.71 | 3.47 | 3.25 | 3.06 | 2.89 | 2.74 | |
| 53 | 5.30 | 4.82 | 4.42 | 4.08 | 3.79 | 3.53 | 3.31 | 3.12 | 2.94 | 2.79 | |
| 54 | 5.40 | 4.91 | 4.50 | 4.15 | 3.86 | 3.60 | 3.38 | 3.18 | 3.00 | 2.84 | |
| 55 | 5.50 | 5.00 | 4.58 | 4.23 | 3.93 | 3.67 | 3.44 | 3.24 | 3.06 | 2.89 | |
| 56 | 5.60 | 5.09 | 4.67 | 4.31 | 4.00 | 3.73 | 3.50 | 3.29 | 3.11 | 2.95 | |
| 57 | 5.70 | 5.18 | 4.75 | 4.38 | 4.07 | 3.80 | 3.56 | 3.35 | 3.17 | 3.00 | |
| 58 | 5.80 | 5.27 | 4.83 | 4.46 | 4.14 | 3.87 | 3.63 | 3.41 | 3.22 | 3.05 | |
| 59 | 5.90 | 5.36 | 4.92 | 4.54 | 4.21 | 3.93 | 3.69 | 3.47 | 3.28 | 3.11 | |
| 60 | 6.00 | 5.45 | 5.00 | 4.62 | 4.29 | 4.00 | 3.75 | 3.53 | 3.33 | 3.16 | |
| 61 | 6.10 | 5.55 | 5.08 | 4.69 | 4.36 | 4.07 | 3.81 | 3.59 | 3.39 | 3.21 | |
| 62 | 6.20 | 5.64 | 5.17 | 4.77 | 4.43 | 4.13 | 3.88 | 3.65 | 3.44 | 3.26 | |
Lowering the ratio increases top-end speed. Increasing the ratio increases acceleration and bottom-end power.
"...The sprocket your bike would choose..."
- High stock levels held within the UK for swift delivery.
- A tough, durable, long lasting sprocket.
- Formed of the best quality Japanese-sourced materials.
- Made with the latest sprocket manufacturing technology.
- A longer lasting sprocket means a longer lasting chain.
Japanese company Sunstar are the largest manufacturer of OE sprockets in the world and since 1946 have supplied their top quality steel sprockets to the likes of Honda, Kawasaki, Suzuki, Yamaha and Triumph and more.
It's a combination of high-grade, high-carbon steel, and a heat treatment and quenching process unique to Sunstar, that makes Sunstar one of the strongest, most durable and longest lasting sprockets in the world. And a harder wearing sprocket means a longer lasting chain.
The first choice of most major manufacturers, more bikes leave the showroom with a Sunstar sprocket than any other make. Now Sunstar is available in the UK for a wide range of models from Wemoto
