Quick Summary
The Cane Creek Seatpost Reducer 31.6-34.9 mm is a seatpost reducer for a 31.6 mm seatpost and a 34.9 mm clamp diameter. It is a simple size-specific part, so the main buying check is whether those two measurements match the frame and seatpost you plan to use it with.
What to Compare Before Buying
- Seatpost diameter: This part is for 31.6 mm seatposts. Check your seatpost measurement before choosing an offer.
- Clamp diameter: The clamp diameter is 34.9 mm. Compare this with the seat tube or clamp size on the bike.
- Exact fit: Size reducers depend on the correct measurement combination, so confirm both figures rather than relying on appearance alone.
Before You Decide
Confirm that your seatpost is 31.6 mm and the clamp diameter you need is 34.9 mm. If either measurement differs, a different reducer size is needed.









