Application: Bicycle Seatpost reducing sleeve shim matches well with most bicycles, such as MTB ,BMX ,Fixed Gear bike,mountain bike, road bike, city bike and more, you can easily adjust the diameter of the bicycle seat post, eliminating the trouble of repurchg the bike seatpost. Tips: Please check your bike frame seat tube outside diameter. Measure the inside diameter of your old clamp. Or measure the outside diameter of your seat tube (on your bike frame). Then make a right choice. - - -Because of hollow design,In the process of transportation are squeezed may be out of shape,Please kindly exchange one. Size: 30.9 to 27.2 seatpost shim. Length: 100mm. Feature:Use this bike post Shim, 27.2 mm Seat Post shim can be converted to 30.9 mountain bike seat post, bike seatpost adapter shim can help you change the bicycle seat tube outer diameter to meet your needs. Material: bike Seat adapter is made of high quality 6061 aluminum alloy, CNC machining CD texture surface ,anti-rust and durable.

Bike Type: Mountain Bike. Brand: GANOPPER. Material: Aluminum. Color: Black. Date First Available: December 24, 2020. Best Sellers Rank: #17,662 in Sports & Outdoors. Customer Reviews: 4.5 out of 5 stars 573 ratings 4.5 out of 5 stars. : B08R95DHSN. Sport Type: ?Cycling. Size: ?27.2 I.D./30.9O.D. Part Number: ?GNPSM272309. Manufacturer: ?GANOPPER. Material: ?Aluminum. Color: ?Black. Brand Name: ?GANOPPER. Package Weight: ?0.06 Kilograms. Item Package Dimensions L x W x H: ?4.09 x 1.65 x 1.54 inches.