This aluminum alloy seat post adapter shim is designed to securely fit various sizes of bike seat posts, ensuring stability without wobble during your ride. The seat tube reducing sleeve acts as a precision bicycle seatpost tube adapter for mountain bikes and folding bikes, efficiently preventing wear and extending your bike's lifespan. Ideal for frequent riders needing quick adjustments or replacements on the go. Features -Color:Silver -Material:Aluminium alloy -Size:8.10X3.90X3.90cm/3.18X1.53X1.53in -Inner diameter: 33.9mm -Outer diameter: 36mm -High compatibility: the bike seat post reducer providing a secure bike seat post tube adapter solution for different bikes and adapting to multiple seat posts -Metal material: made from highprecision aluminum alloy, this seatpost shim ensures stability and durability, acting as a reliable bicycle seat post sleeve for both mountain and folding bikes -Easy installation: the seat post adapter shim requires no professional tools, making it a userfriendly bike part that’s simple to install and remove whenever adjustments are needed -Lightweight design: this bike stem shim features a lightweight metal conversion sleeve that won’t weigh down your bike, suitable for riders seeking a bike accessory that enhances portability and maneuverability -Wear protection: the seat post reducing sleeve prevents seat tube friction and wear, ensuring your seat post tube and seat tube adapter last longer, ideal for frequent or long distance riders Package list: 3 x seatpost tube adapters