What Is a Bike Cassette?
A bike cassette is the cluster of sprockets mounted to the rear wheel hub. It works with the chain, rear derailleur and crankset to control gear selection and pedalling resistance.
The tooth range (for example, 11–28T or 11–32T) determines how easy or hard it is to pedal in different conditions. Larger sprockets make climbing easier. Smaller sprockets allow higher speeds on flat terrain.
Matching Cassette Speed
Your cassette must match the number of speeds in your drivetrain.
For example:
- An 11-speed cassette must be used with an 11-speed chain and shifter.
- A 10-speed cassette must match a 10-speed drivetrain.
Each speed uses different sprocket spacing. Mixing components will result in poor shifting performance.
Choosing the Right Gear Range
Cassettes are available in different tooth ranges depending on riding style.
- Smaller ranges (e.g. 11–32T) are common on road bikes.
- Wider ranges (e.g. 10–52T) are common on mountain bikes.
Selecting the right range depends on terrain, fitness level and riding style.
Freehub Body Compatibility
Your freehub must match your cassette type.
- Shimano / SRAM HG fits most 8–11 speed cassettes.
- SRAM XD and XDR are used for certain 11 and 12-speed systems.
- Shimano MicroSpline is required for Shimano 12-speed MTB cassettes.
- Campagnolo cassettes require Campagnolo freehubs.
Confirm your hub standard before purchasing.
Brand Compatibility
Cassette spacing and design vary by manufacturer.
Shimano and SRAM are often compatible in lower speeds but may differ at 11 and 12-speed levels. Campagnolo uses its own spacing system. Always confirm compatibility across cassette, bike chain and rear derailleur.
