The latest innovation in racing bike gears is the introduction of 10- and even 11-speed rear gears. It is possible to upgrade to a 10-speed cassette without replacing your original nine-speed rear derailleur.
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Check the compatibility of your nine-speed rear derailleur with your 10-speed cassette. The cassette and rear derailleur should be made by the same manufacturer to ensure smooth and accurate shifting, for example Shimano cassettes work best with Shimano rear derailleurs.
Ensure that the shifters are 10-speed and the same make and model as the cassette. This is crucial as the indexing of the shifters -- the amount of cable pulled by each click -- must match the spacing between each sprocket of the cassette.
Install a 10-speed chain. Ten-speed chains are narrower than nine-speed chains so they match the narrower spacing between the sprockets on the cassette. Place the chain over the jockey wheels of the rear derailleur to ensure the narrower chain matches the teeth of the cogs.
Install and set up the gears as usual. Before riding, check the gears shift up and down the cassette without double shifting or slipping and that the chain runs smoothly through the drivetrain.
Tips and warnings
- Some makes of cassettes and rear derailleurs will be compatible with other makes. Please seek advice from a mechanic before mixing and matching manufacturers.
- It is not necessary to use a chain of the same manufacturer as the cassette.
- Freehub bodies are designed to operate with eight-, nine-, or 10-speed cassettes so it is possible to install your new 10-speed cassette onto your existing nine-speed hub.
- When mixing and matching any gears it is crucial the shifters and the cassette are the same speed, make and model.
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