Wheel Guides
Freehub Choice Checklist Before Buying Wheels
Jun
The freehub is easy to overlook because it hides behind the cassette. Choose the wrong one, though, and a new rear wheel can arrive looking perfect but refuse to take your gears. Before choosing rim depth or finish, make sure the rear wheel can accept the cassette you use.
The quick freehub checklist
| Drivetrain brand | Shimano, SRAM, and Campagnolo can use different cassette standards. |
|---|---|
| Number of speeds | Count the cogs on the cassette. 8, 9, 10, 11, and 12 speed setups can need different spacing. |
| Cassette model | The model name often reveals whether you need HG, XDR, Campagnolo, or another body. |
| Smallest cog | A 10 tooth smallest cog is a clue that the cassette may need a different driver than older road cassettes. |
| Spacer use | Some cassette and freehub combinations need a spacer. Keep old spacers organized if moving parts over. |
Common names buyers see
Shimano HG road is common on many Shimano and compatible road drivetrains. Many 11 speed road cassettes use this style, and some older 8, 9, or 10 speed cassettes may need a spacer depending on the wheel and cassette.
SRAM XDR is used for many modern SRAM road 12 speed cassettes. It is not the same as an older Shimano-style body. If you are running a newer SRAM cassette, do not guess.
Campagnolo can require its own freehub body. If your shifters and derailleur are Campagnolo, treat that as a separate check before ordering.
How to identify what you have
- Look at the brand printed on your shifters and rear derailleur.
- Count the cogs on the cassette.
- Check the smallest cog size if you can read it.
- Search your bike model spec sheet if the bike is original.
- Take a clear photo of the cassette, rear derailleur, and current wheel if unsure.
You do not need to become a drivetrain expert to buy wheels. You just need enough information to avoid a mismatch. The compatibility guide covers the main checks, and contact is the right place to send photos if the cassette standard is unclear.
Once freehub choice is clear, compare the current wheelsets in the shop. If a local mechanic is installing the wheels, ask them to confirm cassette fit and brake pad alignment at the same time.
Look at the bike, not the memory
Freehub mistakes often happen because riders remember the bike as it was sold, not as it is built now. A used bike may have a different cassette, wheel, or groupset from the original catalog. Before ordering, look at the actual cassette on the bike. Count speeds if you can, note the brand, and take a clear photo from the drivetrain side.
Shimano and SRAM road cassettes commonly share one freehub style, while Campagnolo uses a different one. That simple distinction solves many orders, but there are exceptions around newer systems and older bikes. If you are unsure, do not choose based on a guess.
What to send for a quick freehub check
Send a photo of the cassette, rear derailleur, and current rear wheel hub area through contact. Include the cassette speed count if known. A 299 USD wheelset is only a good deal if it arrives ready to accept the cassette you actually use.
