BiKASE Seat Post Shim 27.2mm to 33.9mm

This shim lets you fit a 27.2 mm seatpost into a frame with a 33.9 mm seat tube. Slide the shim into the seat tube, insert the post, and clamp as normal. It is the simple fix when you want to reuse a favorite saddle and post on a new frame, swap in a dropper or suspension post, or replace a lost or damaged original.

Measure your seatpost and seat tube inside diameter carefully before ordering; the two numbers in the title must match your setup.

Product details

• Seatpost: 27.2 mm
• Seat tube: 33.9 mm

Not sure of your sizes? Email us the make and model of your bike and we will check. Local pickup in Fayetteville, NY is available by appointment.