Transmission

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  • CBR 125
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The UK’s largest range of motorcycle chains and sprockets

Wemoto brings you the most comprehensive stock of chains and sprockets for motorcycles.

Replacing a motorcycle chain

Many experienced riders ‘just know' when it is time to replace the chain, but there are a few tests that can help assess chain condition if you’re not so sure:

  • The rollers should not be loose, but rotate freely without too much side to side movement.
  • There should not be excessive lateral play in the chain. That is, if you grasp the chain and twist it about a an axis perpendicular to the ground, there should be an amount of give but no sloppiness - try reciprocating the action to be sure.
  • If you try to pull the chain away from the rear sprocket at the point furthest away from the front sprocket there should be no more than 3 or 4 mm of movement.

If you have run out of adjustment on the chain, you could remove two links and rejoin the chain. We don’t recommend this, though, because a chain that has worn this much will have grown in length so much that it will be wearing your bike’s sprockets badly.

Choose the right motorcycle chain

With pitches from 420 to 630, in standard, heavy duty, O-ring, or X-ring, with gold link options for many, Wemoto stocks chains suitable for all current and thousands of older Japanese and European motorcycles. Brands include popular DID as well as Japanese Izumi and Regina for classic models.

For the standard size and pitch chain for your bike, search for your model above. For custom length chains check the links below:

Lubrication and correct adjustment make your chain last longer. The more attention you pay to these details the longer they will last. We stock chain rivet, split or spring links, chain guards and breaking and riveting tools, as well as chain wax, lubrication and scottoilers

Motorcycle sprockets for thousands of models

With over 700 different front sprockets and 1200 different rear sprockets, Wemoto has the UK's most complete range of motorcycle sprockets. Rear motorcycle sprockets are available in both steel and lightweight alloy types.

Sunstar sprockets - in many cases made by the same manufacturer that made your OE sprockets – are also now available from Wemoto.

You can change your gearing ratio by choosing sprockets with more teeth or less, for higher top speed or faster acceleration. See our sprocket gearing guide here.

Replacing motorcycle sprockets

Though it is not necessary to replace the sprockets at the same time as the chain, it is certainly advisable. Just as a worn chain can damage sprockets, the reverse is also true. Sprocket wear can be quite difficult to see with the naked eye, so not replacing the sprockets at the same time as your chain can be a false economy and shorten the life of your chain.

In any case, if the sprockets show any signs of 'hooking' (the teeth appearing to lean over at the top), then you should replace both chain and sprockets immediately.

Why not search for your bike (above) or your motorcycle sprocket (right)?