Product name: seat tube reducer Material: aluminum alloy Specification weight: 22.2 to 25.4 (about 20g) / 25.4 to 27.2 (about 13g) / 25.4 to 28.6 (about 23g) / 27.2 to 28.5 (about 12g) / 27.2 to 30.4 (about 24g) / 27-2 to 30.8 (about 26g) / 27.2 to 31.6 (about 33g) / 27.2 to 33.9 (about 51g) / 31.6 to 33.9 (about 20g) / 33.9 to 34.9 (about 7.9g) Height: about 60mm (34.9 height 40mm) Fits: Suitable for 22.2/25.4/27.2/31.6/33.9 bore seatposts Features: Made of aluminum alloy, it is light and beautiful, and the machining precision is precise, which can solve the problem that the size of your frame and the seat tube do not match. How to choose the size of the seat tube reducer: (1) Check the diameter of the original sitting rod, generally marked, no measurement of the diameter of the sitting rod, such as the owner of the original sitting rod diameter is 31.6mm. (2) If the diameter of the original sitting pole cannot be found, the inner diameter of the frame seat tube hole can be measured, which is 31.6mm as shown in the figure. (3)The diameter of the newly purchased sitting rod is 27.2mm, so choose 27.2 to 31.6mm.

?Warming 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. ?Different Size?Our product have 10 different seat post tube adapter, you can choose the bicycle seat tube to the size you want. ?Easy to Use?1-Open the clamp. 2-Put the seat post and shim adapter in. 3-Adjust the post height. 4-Lock the clamp.Apply this bike seat post shim, 22.2 ID Kids Bike ,BMX seat post can be switched to 25.4 bike seat post(22.2 to 25.4 for example). ?Superb Material?Made of high-quality aluminum alloy, light weight and portable, rust-proof and durable, it can solve the problem that your car price does not match the seat tube size. ?Compatible With?Compatible with most bicycles, Suitable for MTB bike, road bike, etc. You can easily adjust the diameter of the bicycle .seat post and no more wasting money on repurchg a seat post.

Bike Type: Road Bike. Brand: Generic. Material: Aluminum. Color: Black. Date First Available: July 2, 2022. Best Sellers Rank: #101,414 in Sports & Outdoors. Customer Reviews: 4.2 out of 5 stars 21 ratings 4.2 out of 5 stars. : B0B5MRZZ8Z. Size: ?Seatpost shim-22.2 to 25.4mm. Included Components: ?Bicycle Seatpost Tube Adapter. Part Number: ?ZG001-22.2-25.4. Manufacturer: ?METBUY. Suggested Users: ?unisex-adult. Material: ?Aluminum. Color: ?Black. Model Name: ?Bicycle Seatpost Tube Adapter. Brand Name: ?Generic. Package Weight: ?0.07 Kilograms. Item Package Dimensions L x W x H: ?3.11 x 2.28 x 1.02 inches.