---
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: "€ 17.60"
currency: EUR
in_stock: true
reviews_count: 8
category: "Cysky"
url: https://www.desertcart.hr/products/106824486-cysky-bike-seatpost-adapter-shim-25-4-27-2-28
store_origin: HR
region: Croatia
---

# Compact 60mm length for sleek profile Precision fit for 8 seatpost sizes Durable aluminum alloy, rust-resistant 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:** € 17.60
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Upgrade your ride, adapt like a pro!

## 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?** € 17.60 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/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

- • **Sleek 60mm Length:** Optimized size ensures a clean, professional look without added bulk.
- • **Trusted by Riders:** Highly rated with 4.5 stars and glowing reviews from mountain bikers to BMX enthusiasts.
- • **Premium Aluminum Alloy:** Engineered for strength and corrosion resistance, built to last through every ride.
- • **Effortless Installation:** Quickly upgrade or swap your seatpost with zero hassle—perfect for on-the-go pros.
- • **Universal Compatibility:** Seamlessly adapts seatposts from 25.4mm up to 34.9mm—one shim to rule them all.

## Overview

The CYSKY Bike SeatPost Adapter Shim is a precision-engineered aluminum alloy sleeve designed to fit seatpost diameters ranging from 25.4mm to 34.9mm with a compact 60mm length. Ideal for mountain, road, BMX, and fixie bikes, it offers rust resistance and durability, ensuring a secure and sleek fit. Trusted by riders with a 4.5-star rating, it enables effortless seatpost upgrades and customization.

## Description

desertcart.com : Seatpost Adapter Shim, Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX, Fixie Gear. 27.2mm to 33.9mm : Sports & Outdoors

Review: Works as expected - Worked perfectly to adapt a smaller seat post
Review: Worked perfectly - Worked perfectly to allow me to transition my daughter's racing class BMX seat to a longer post with an adjustable seat. Now she has the perfect height and couldn't be happier. It's made very well I don't see it breaking any time soon and it was well worth the few bucks I spent.

## 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 | #120,252 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #84 in Bike Seat Posts |
| Bike Type | Mountain Bike |
| Brand Name | CYSKY |
| Color | 27.2-33.9mm |
| Customer Reviews | 4.5 4.5 out of 5 stars (474) |
| Item Dimensions W x H | 1.07"W x 2.36"H |
| Item Weight | 0.05 Kilograms |
| Manufacturer | CYSKY |
| Manufacturer Part Number | CYSKY Seatpost 33.9 |
| Material Type | Aluminum |
| Model Number | CYSKY Seatpost 33.9 |
| 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 M***T on December 30, 2025*

Worked perfectly to adapt a smaller seat post

### ⭐⭐⭐⭐⭐ Worked perfectly
*by R***! on July 6, 2020*

Worked perfectly to allow me to transition my daughter's racing class BMX seat to a longer post with an adjustable seat. Now she has the perfect height and couldn't be happier. It's made very well I don't see it breaking any time soon and it was well worth the few bucks I spent.

### ⭐⭐⭐⭐ did the job
*by M***H on 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 Croatia*
*Store origin: HR*
*Last updated: 2026-07-11*