Description
Steel Sprocket for Derbi Senda DRD / X-Treme
Doppler Origin steel sprocket with 53 teeth for 420 chains (standard).
Doppler offers sturdy, high-quality sprockets that stand out not only for their function but also for their attractive design. It can be used as a replacement for the original sprocket or to give the bike a more distinctive look.
Compatibility
- Aprilia RX 50 from 2011
- Derbi Senda DRD up to 2012 / DRD X-Treme from 2011 (not SM)
- Gilera RCR 50 from 2011
Sprockets with a 102 mm inner diameter were relatively rare before 2012 and were mainly fitted on Derbi DRD models. From 2011, they were used on Derbi Senda X-Treme models with 21"/18" wheels, as well as on Aprilia RX50 and Gilera RCR50 models.
Note: Since there are different variants depending on the model year and version, please compare the dimensions and tooth count of your sprocket with the photo and the specifications. You can find a list with the most common versions.
details Doppler steel sprocket
- Mounting: 6 holes, 3x2
- Inner diameter: 102 mm
- Chain type: 420
- Teeth: 53
- Color: Black
- Derbi OEM number: 2B004447
Funstion of Rear procket
The rear sprocket of a motorcycle is an essential part of the chain drive. It is mounted directly on the rear wheel and is connected to the front sprocket via a chain.
How can I tell if the sprocket is worn?
You can usually identify rear sprocket wear by inspecting the teeth. Worn teeth have an irregular shape and appear thin, very pointed or bent. You may also notice metallic rattling noises. Severe wear can cause the chain to skip because it slips over the excessively worn teeth.
smaller or larger Sprocket?
- Sprocket with more teeth → improved acceleration
- Sprocket with fewer teeth → higher top speed
You also have to consider the gear ratio between rear and front sprocket. The calculation is: number of teeth of rear sprocket / number of teeth of front spocket. A low ratio increases speed, while a high ratio improves acceleration.
Example: Front sprocket with 13 teeth and rear sprocket with 48 teeth: 48/13 = a ratio of 3.69.
Sprocket types
Steel is preferable to aluminium if you want the longest possible service life. Aluminium is the better choice for maximum performance because it is lighter. Self-cleaning anti-mud rear sprockets are suitable for off-road use in dirt and mud.
Chain care
To ensure optimal life, it is important that you do not neglect chain care, we recommend a special chain brush.
Overview of most common sprockets
- Sprocket, 62 mm internal diameter / 5-hole: Rieju (older models), Peugeot, Motorhispania
- Sprocket, 100 mm internal diameter / 4-hole: Beta RR50 from 2005
- Sprocket, 102 mm internal diameter / 6-hole 3x2: Derbi Senda DRD
- Sprocket, 105 mm internal diameter / 6-hole 3x2: Aprilia, Derbi, Gilera, Rieju, Peugeot, Motorhispania, Yamaha, MBK
- Sprocket, 108 mm internal diameter / 6-hole: Aprilia, Derbi, Gilera