Quick Summary
The HOUSON bicycle seat post shim is a 60 mm reducing sleeve for changing a 27.2 mm seat post fit to 31.6 mm. It is a bicycle adapter for MTB, BMX, mountain bike, road bike and e-bike use.
This seat post spacer is made from aluminium alloy. The key buying checks are the length, the two stated diameters and whether the adapter matches the seat post sizes on your bike and seat post.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Brand | HOUSON. Useful for identifying the exact adapter. |
| Product type | Bicycle seat post shim / reducing sleeve / tube adapter. The main function is to adapt seat post diameter. |
| Length | 60 mm. Check this against the available seat tube insertion depth. |
| Inner diameter | 27.2 mm. This is the size of the seat post it accepts. |
| Outer diameter | 31.6 mm. This is the size it reduces to match. |
| Material | Aluminium alloy. A useful check if material matters to your setup. |
| Compatible bike types | MTB, BMX, mountain bike, road bike and e-bike are named as suitable uses. |
What to Compare Before Buying
- Seat post size: This adapter is for 27.2 mm to 31.6 mm fitting. Compare both sizes with your current seat post and frame.
- Insertion length: The shim is 60 mm long. Check that your seat tube allows enough insertion depth.
- Material: It is made from aluminium alloy. Compare this with the material you want for your setup.
- Bike type: MTB, BMX, mountain bike, road bike and e-bike are named uses, but the size match is the deciding factor.
Compatibility, Size and Fit
This adapter is intended for a 27.2 mm seat post and a 31.6 mm frame or seat tube opening. Size matching is the main point to confirm before choosing an offer. If the measured diameters on your bike differ, a different shim size is needed.
Check the available insertion space as well. A 60 mm shim still needs enough room inside the seat tube to seat correctly.
Before You Decide
Confirm the 27.2 mm to 31.6 mm size match before choosing an offer. Check that the 60 mm length suits the insertion space on your bike. If your seat post or frame uses a different diameter, select the correct shim size instead.
