---
product_id: 106824486
title: "CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX"
brand: "cysky"
price: "63.38 DT"
currency: TND
in_stock: true
reviews_count: 8
url: https://www.desertcart.tn/products/106824486-cysky-bike-seatpost-adapter-shim-25-4-27-2-28
store_origin: TN
region: Tunisia
---

# Compact 60mm length for sleek integration Precision fit for 8 seatpost sizes Durable anti-rust aluminum alloy CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX

**Brand:** cysky
**Price:** 63.38 DT
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Upgrade your ride with precision – don’t let a loose seatpost slow you down!

## Quick Answers

- **What is this?** CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX by cysky
- **How much does it cost?** 63.38 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/106824486-cysky-bike-seatpost-adapter-shim-25-4-27-2-28)

## Best For

- cysky enthusiasts

## Why This Product

- Trusted cysky brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Easy Installation:** Quickly upgrade or adapt your bike seatpost without hassle
- • **Perfect Fit Every Time:** Ensures secure seatpost clamping with precise diameter options
- • **Premium Aluminum Alloy:** Lightweight yet ultra-durable, built to resist rust and wear
- • **Sleek & Compact Design:** 60mm length keeps your bike’s profile clean and aerodynamic
- • **Universal Compatibility:** Fits 25.4mm to 34.9mm seat tubes for MTB, road, BMX & more

## Overview

The CYSKY Bike SeatPost Adapter Shim is a high-quality aluminum alloy reducing sleeve designed to fit seat tubes ranging from 25.4mm to 34.9mm in diameter. With a compact 60mm length, it provides a durable, rust-resistant solution for securely adapting your mountain, road, BMX, or MTB bike seatpost for a perfect, stable fit.

## Features

- Made of aluminum alloy material, anti-rust and durable.
- Size: 27.2mm to 33.9mm
- Length:60mm
- Suit for MTB bike, mountain bike, road bike etc.
- 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 |
|---------------|-------|
| Asin | B07JYXC641 |
| Best Sellers Rank | #107,036 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #79 in Bike Seat Posts |
| Bike Type | Mountain Bike |
| Brand Name | CYSKY |
| Color | 27.2-33.9mm |
| Customer Reviews | 4.6 4.6 out of 5 stars (480) 4.6 out of 5 stars |
| Item Diameter | 27.2 millimeters |
| Item Dimensions W X H | 1.07"W x 2.36"H |
| Manufacturer | CYSKY |
| Manufacturer Part Number | CYSKY Seatpost 33.9 |
| Material Type | Aluminum |
| Model Number | CYSKY Seatpost 33.9 |
| Number Of Items | 1 |
| Unit Count | 1 Count |
| Upc | 734779642542 |

## Product Details

- **Brand:** CYSKY
- **Color:** 27.2-33.9mm
- **Item Weight:** 0.05 Kilograms
- **Material:** Aluminum
- **Product Dimensions:** 1.07"W x 2.36"H

## Images

![CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX - Image 1](https://m.media-amazon.com/images/I/41rEMmB6F8L.jpg)
![CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX - Image 2](https://m.media-amazon.com/images/I/51OD5-s-g+L.jpg)
![CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX - Image 3](https://m.media-amazon.com/images/I/41uGni8eEsL.jpg)
![CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX - Image 4](https://m.media-amazon.com/images/I/41VSKWQ+DuL.jpg)
![CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX - Image 5](https://m.media-amazon.com/images/I/41s9FcSrnKL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works as expected
*by  on Reviewed in the United States December 30, 2025*

Worked perfectly to adapt a smaller seat post

### ⭐⭐⭐⭐⭐ Works as intended
*by  on Reviewed in the United States August 17, 2025*

Works as intended.

### ⭐⭐⭐⭐ did the job
*by  on Reviewed in the United States July 7, 2019*

Works as advertised. Allowed me to use an older seat on a new bike for my son.

---

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-09-16*