Buying guides
Cassette or freewheel: identify the rear gears on an e-bike
A cassette and a threaded freewheel can look similar from the side of a bicycle, but they attach to the rear hub differently. Identify which system is fitted before ordering new rear gears or a removal tool. The number of sprockets alone leaves that question unanswered.
The three terms, explained
| Term | What it describes |
|---|---|
| Cassette | The sprockets that fit over the splines of a freehub body and are retained by a lockring. |
| Freehub | The ratcheting body on the hub that carries a cassette. It remains on the hub when the cassette is removed. |
| Threaded freewheel | A sprocket assembly with its own ratcheting mechanism, which threads onto the hub. |
The ratcheting mechanism allows the wheel to keep turning when you coast. Its location is the key distinction in this comparison.
How the system is identified
Park Tool's identification guide describes observing the tool fitting as the sprockets turn backwards: on a cassette it turns with them, while a threaded freewheel's removal fitting remains stationary. The guide also shows why superficially similar tool fittings need accurate identification.
For an e-bike, follow the model's wheel-removal instructions if access requires removing the wheel. A hub motor adds its own connection and fastening arrangements. A mechanic can carry out the identification if you are unfamiliar with those steps.
Prepare the replacement enquiry
Record the bike and rear-component identification, number of sprockets and any readable markings. Provide a clear view of the centre fitting as well as the side of the gear cluster. Describe the reason for replacement: wear, damage, a service recommendation or a proposed gearing change.
| Decision | Information to confirm |
|---|---|
| Replacement rear gears | System, fitting, speed count, tooth range and compatibility with the rest of the transmission. |
| Removal tool | The exact tool fitting on the installed part, including any access restriction. |
| Gearing change | Compatibility with the hub, chain, derailleur and shifter as a complete arrangement. |
Keep the repair tied to the actual bicycle
A slipping chain does not establish that the rear gear cluster needs replacing, and a catalogue photograph does not establish which revision is on a particular bike. Identify the cause and the fitted component before ordering.
For a Maverick or Trail, send TXED Support the component record. The reply can then identify the relevant model information without relying on a generic “seven-speed” description.