What tools do I need to remove a cassette?
The lockring is designed to hold the cogs of the cassette in place on the hub. In order to remove and replace your cassette, you need to unscrew this lockring. You’ll need three tools to do this: a chain whip, a cassette lockring remover and a large adjustable crescent wrench.
Are rear derailleurs universal?
The important thing is that the different ratios means that rear mechs and shifters are not interchangeable between manufacturers – Shimano rear mechs must be matched with Shimano shifters, and SRAM with SRAM (however Shimano front mechs can be used with SRAM shifters).
When should you replace rear cassette?
Once the chain wear is approaching 1% “stretch”, it’s usually time to replace the cassette as well. Because the teeth on the cassette will have worn down to more or less match the chain wear, if a new chain is fitted to a worn cassette, it won’t mesh properly and may jump or skip, especially when changing gear.