Calandis 27.2mm Seatpost to 30.4mm Bicycle Seat Tube Sleeve Shim Adapter-60mm Black - Product Features
- Inner diameter is 27.2mm/1.07inch, outer diameter is 30.4mm/1.20inch
- Made of aluminium alloy
- Please check your bike frame seat tube outside diameter. measure the inside diameter of your old clamp.
- Use this seatpost sleeve adapter ring, you can use 27.2mm seatpost on your 30.4/30.8/31.6mm bike seatpost
- Or measure the outside diameter of your seat tube (on your bike frame). then make a right choice