Quick Summary
This is a bicycle seat post adapter shim for adapting a 27.2 mm seatpost to fit a 30.9 mm seat tube. It is made from aluminium alloy and uses a sleeve design for fitting a bike seat post.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Product type | Seat post adapter shim. Check that this is the part you need before comparing offers. |
| Size | 27.2 mm to 30.9 mm. The buyer must match both seatpost and seat tube sizes. |
| Material | Aluminium alloy. Material matters if you want to compare the adapter type. |
| Design | Sleeve design. Compare the fitting style with the seatpost setup you have. |
What to Compare Before Buying
- Seatpost size: This adapter is for 27.2 mm to 30.9 mm sizing. Match the smaller end to the seatpost and the larger end to the seat tube.
- Material: It is made from aluminium alloy. Compare that with any material preference you have for the part.
- Fit style: The sleeve design is part of the product’s function. Check that your bike uses a seatpost adapter rather than a different fitting solution.
- Bike setup: The part is intended for bicycle seat post adaptation. Confirm that this is the size change your bike requires.
Compatibility, Size and Fit
The stated compatibility is for adapting a 27.2 mm seatpost to a 30.9 mm seat tube. This is the main detail to confirm before buying, as seatpost shims are size-specific and visual similarity is not enough.
Before You Decide
Confirm the 27.2 mm to 30.9 mm size match before choosing an offer. Check that you need a seat post adapter shim rather than another type of bicycle part. If your bike uses different seatpost or seat tube sizes, a different adapter size will be needed.
