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Chain Tensioner wheel axle 12mm Doppler Alu CNC red Derbi / Gilera / Aprilia
Article no.: CGN508640

Chain Tensioner wheel axle 12mm Doppler Alu CNC red Derbi / Gilera / Aprilia

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Chain Tensioner wheel axle 12mm Doppler Alu CNC red Derbi / Gilera / Aprilia. Replacement for worn chain tensioners and for custom purposes.

These high-quality, CNC-machined chain tensioners have a coloured anodized finish and Doppler logo to add colourful accents to your wheels.

The chain tensioners are available in different colours and are sold in pairs.

Questions about the product
Notes and Safety

Chain Tensioner

We carry a wide selection of chain tensioners for 50cc motorcycles, mopeds and motocross bikes.

Motorcycle Chain Tensioner

It's best to follow the instructions in your vehicle's owner's manual.

A chain that is too loose tends to "rattle" and can even jump out of its guide. A chain that is too tight can cause premature wear (the chain will stretch over time) or even break. When the shock absorber is compressed, the chain becomes taut. when impacting hard, such as it happens in motocross, a chain that is too tight would not withstand the stress.

If you no longer have a manual, you can check the tension of the chain as follows:

  1. Jack up the motorcycle on the center stand or a bike jack, the rear wheel must be free to move.
  2. Press the chain against the swingarm from below, approximately halfway between the sprocket and the chainring.
  3. The chain should then be tensioned above the swingarm.

You can use chain tensioners to adjust the chain slack by moving the rear sprocket forward or backward. The tension can be adjusted as follows:

  • If the chain is already taut before you push it under the swingarm, you will need to loosen it: adjust the chain tensioners so that the wheel axle is pushed forward (bring the rear sprocket closer to the front sprocket)
  • If the chain is not taut when you push it under the swingarm, you need to tighten it: Adjust the chain tensioners so that they move backward (move the rear sprocket away from the front sprocket)

Different types of chain tensioners

There are chain tensioners with detents, you can often find this type on older motorcycles. These tensioners are fixed to the wheel axle and must be rotated to adjust the tension.
On modern motorcycles, you will find chain tensioners that slide into the swingarm and are tensioned with a bolt.

Original chain tensioners are usually made of aluminum, but there are also anodized custom models and racing versions where you can change the gear ratio in an instant thanks to their asymmetrical shape.

Technical details
Chain Tensioner wheel axle 12mm Doppler Alu CNC red Derbi / Gilera / Aprilia
Article no.CGN508640
Weight0,09 kg
Product typeChain tensioner
Compatible vehicles for this article
Derbi Special Comp.GPR 50cc (1998 - 2001)GPR 50cc after 2012GPR 50cc Nude 2004 (EBS050)GPR 50cc Nude 2005 2011 (D50B0 Euro 3)GPR 50cc R - Replica (2001 - 2004)GPR 50cc Racing 2004 (EBS050)GPR 50cc Racing 2005 - 2011 (D50B0 Euro3)Senda 50cc (before 2000) - (tubular)Senda 2000 50cc (before 2004) - (perimeter) Euro2Senda DRD PRO Racing SM(after 2005)-(D50B0 Euro 3)Senda DRD PRO SM (after 2005) - (D50B0 Euro 3)Senda DRD Racing 50 SM after 2011 - (D50B0 Euro 3)Senda DRD SM (before 2000) - (tubular)Senda DRD SM (before 2004) - (perimeter)-Euro 2Senda DRD X-Treme 50 R '10 - '17 - (D50B0 Euro 3)Senda DRD X-Treme SM '10 - '17 - (D50B0 Euro 3)Senda Enduro (before 2000) - (tubular)Senda Enduro 2000 (before 2004) - (perimeter)-Euro 2Senda Racing SM Euro 4Senda R DRD Enduro (before 2000) - (tubular)Senda R DRD Enduro (before 2004) - (perimeter)-Euro2Senda R DRD PRO Enduro (after 2005) -(D50B0 Euro 3)Senda R DRD Racing Enduro (after 2005)-(D50B0 Euro 3)Senda R X-Race Trail '05 - '10 - (D50B0 Euro 3)Senda R X-Treme Enduro '05 - '10 - (D50B0 Euro 3)Senda SM 50cc (before 2000) - (tubular)Senda SM 2000 (before 2004) - (perimeter)-Euro 2Senda SM Limited Euro 4Senda X-Race 2000 (before 2004) - (perimeter)-Euro 2Senda X-Race SM '05 - '10 - (D50B0 Euro 3) Senda X-Race Trail (before 2000) - (tubular)Senda X-Trem Enduro (before 2000) - (tubular)Senda X-Trem Enduro (before 2004)-(perimeter)-Euro 2Senda X-Treme R Euro 4Senda X-Treme SM '05 - '10 - (D50B0 Euro 3) Senda X-Trem SM (before 2000) - (tubular)Senda X-Trem SM (before 2004) - (perimeter) - Euro 2Senda à partir de 2018
Valenti Racing
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