--- product_id: 414521491 title: "Thinvik Bike Seat Post Shim 22.2mm, 25.4mm, 27.2mm to 25.4mm,27.2mm,28.6mm,30.4mm,30.8mm,31.6mm Bicycle Seatpost Tube Adapter 60MM" brand: "thinvik" price: "$18.29" currency: USD in_stock: true reviews_count: 10 url: https://www.desertcart.us/products/414521491-thinvik-bike-seat-post-shim-22-2mm-25-4mm-27 store_origin: US region: United States of America --- # Easy Installation Multiple Sizes Durable Material Thinvik Bike Seat Post Shim 22.2mm, 25.4mm, 27.2mm to 25.4mm,27.2mm,28.6mm,30.4mm,30.8mm,31.6mm Bicycle Seatpost Tube Adapter 60MM **Brand:** thinvik **Price:** $18.29 **Availability:** βœ… In Stock ## Summary > πŸš΄β€β™‚οΈ Upgrade Your Ride with Ease! ## Quick Answers - **What is this?** Thinvik Bike Seat Post Shim 22.2mm, 25.4mm, 27.2mm to 25.4mm,27.2mm,28.6mm,30.4mm,30.8mm,31.6mm Bicycle Seatpost Tube Adapter 60MM by thinvik - **How much does it cost?** $18.29 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/414521491-thinvik-bike-seat-post-shim-22-2mm-25-4mm-27) ## Best For - thinvik enthusiasts ## Why This Product - Trusted thinvik brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **User-Friendly Design:** Simple installation process ensures you spend less time tinkering and more time riding. - β€’ **Lightweight & Durable:** Crafted from high-quality 6061 aluminum alloy for long-lasting performance. - β€’ **Rust-Resistant Finish:** CNC machined surface provides a sleek look while resisting corrosion. - β€’ **Perfect for All Riders:** Ideal for mountain bikes, road bikes, and BMX, making it a must-have for every cyclist. - β€’ **Versatile Compatibility:** Easily adapts to various seat post sizes for a perfect fit. ## Overview The Thinvik Bike Seat Post Shim is a versatile and durable adapter designed to fit various seat post sizes, making it an essential accessory for cyclists. Made from high-quality 6061 aluminum alloy, this shim is lightweight, rust-resistant, and easy to install, ensuring a seamless upgrade for mountain bikes, road bikes, and BMX. With multiple size options available, it eliminates the hassle of repurchasing bike seat posts, allowing you to customize your ride effortlessly. ## Description How to select the Correct Size For instance 25.4mm(ID) is your original seatpost diameter 27.2mm(OD) is your Seat tube mouth diameter so you select 25.4mm to 27.2mm seatpost shim That you will make the 25.4mm seat post suitable for the 27.2mm bicycle seat tube mouth ## Features - Size Discription. Different Seat Post Shims for your reference：22.2 to 25.4/25.4 to 27.2/27.2 to 28.6/27.2 to 30.4/27.2 to 30.8/27.2 to 31.6mm seatpost shims. Length:60mm. - Compatible with Bicycle Seatpost shims compatible well with most bicycles, Suitable for MTB bike, mountain bike, road bike, etc. you can easily adjust the diameter of the bicycle seat post,eliminating the trouble of repurchasing the bike seatpost.Or you can also use this reducer as bike handlebar shim - Superb Material. The bike Seatpost Shim is made of high quality 6061 aluminum alloy, CNC machining CD texture surface ,light weight and portable, anti-rust and durable - Easy to Use. 1-Open the clamp. 2-Put the seatpost and Shim adapter in. 3-Adjust the post height. 4-Lock the clamp.Apply this bike post shim, 22.2 ID Kids Bike ,BMX Seat Post can be Switched as 25.4 bike seat post. - 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. ## Technical Specifications | Specification | Value | |---------------|-------| | Bike Type | Mountain Bike | | Material Type | Aluminum | | Item Dimensions W x H | 1.07"W x 2.36"H | ## Images ![Thinvik Bike Seat Post Shim 22.2mm, 25.4mm, 27.2mm to 25.4mm,27.2mm,28.6mm,30.4mm,30.8mm,31.6mm Bicycle Seatpost Tube Adapter 60MM - Image 1](https://m.media-amazon.com/images/I/51JEhY0ZkeL.jpg) ![Thinvik Bike Seat Post Shim 22.2mm, 25.4mm, 27.2mm to 25.4mm,27.2mm,28.6mm,30.4mm,30.8mm,31.6mm Bicycle Seatpost Tube Adapter 60MM - Image 2](https://m.media-amazon.com/images/I/615q0wVvhML.jpg) ![Thinvik Bike Seat Post Shim 22.2mm, 25.4mm, 27.2mm to 25.4mm,27.2mm,28.6mm,30.4mm,30.8mm,31.6mm Bicycle Seatpost Tube Adapter 60MM - Image 3](https://m.media-amazon.com/images/I/6160GhA9CgL.jpg) ![Thinvik Bike Seat Post Shim 22.2mm, 25.4mm, 27.2mm to 25.4mm,27.2mm,28.6mm,30.4mm,30.8mm,31.6mm Bicycle Seatpost Tube Adapter 60MM - Image 4](https://m.media-amazon.com/images/I/61Du17UuDQL.jpg) ![Thinvik Bike Seat Post Shim 22.2mm, 25.4mm, 27.2mm to 25.4mm,27.2mm,28.6mm,30.4mm,30.8mm,31.6mm Bicycle Seatpost Tube Adapter 60MM - Image 5](https://m.media-amazon.com/images/I/61OoinGamzL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Works great - a real lifesaver *by E***R on Reviewed in the United States on August 22, 2023* Ordered this for a new Ebike we just purchased. Installed a Suntour suspension seat post and needed this shim to seal the deal.Works great ,thanks! ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Bike seat post shim *by J***H on Reviewed in the United States on July 24, 2023* This product worked exactly as advertised and I would highly recommend this seller and product. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Performed as needed. Fits a 30.9 into a 31.6 perfectly *by H***L on Reviewed in the United States on December 19, 2022* Performed as needed. Was able to fit a fox transfer 30.9 dropper into a 31.6 seat post perfectly. This will allow me to swap droppers and seat posts between different bikes. Have around 200 trail miles on it so far and it hasn't moved at all. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/414521491-thinvik-bike-seat-post-shim-22-2mm-25-4mm-27](https://www.desertcart.us/products/414521491-thinvik-bike-seat-post-shim-22-2mm-25-4mm-27) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-10-20*