---
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: "$28"
currency: NZD
in_stock: true
reviews_count: 8
url: https://www.desertcart.nz/products/106824486-cysky-bike-seatpost-adapter-shim-25-4-27-2-28
store_origin: NZ
region: New Zealand
---

# Compact 60mm length for sleek profile 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:** $28
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Upgrade your ride, own the trail with precision fit power!

## 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?** $28 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/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

- • **Built to Last:** Crafted from premium aluminum alloy for rust-free, long-term performance
- • **Sleek & Compact:** 60mm length ensures a clean, professional bike setup without bulk
- • **Easy Installation:** Measure once, install fast—no guesswork, just smooth rides
- • **Universal Versatility:** Perfect for MTB, road bikes, BMX—upgrade any ride instantly
- • **Seamless Compatibility:** Fits 25.4mm to 34.9mm seat tubes—one shim to rule them all

## Overview

The CYSKY Bike SeatPost Adapter Shim is a precision-engineered aluminum alloy sleeve designed to fit seat tubes ranging from 25.4mm to 34.9mm with a compact 60mm length. Its anti-rust durability and universal compatibility make it an essential upgrade for mountain, road, and BMX bikes, ensuring a secure, sleek fit and enhanced riding performance.

## Description

Full description not available

## 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 |
|---------------|-------|
| Manufacturer | CYSKY |
| UPC | 734779642542 |
| Item Package Dimensions L x W x H | 2.4 x 2.09 x 1.3 inches |
| Package Weight | 0.05 Kilograms |
| Item Dimensions  LxWxH | 1.07 x 1.07 x 2.36 inches |
| Brand Name | CYSKY |
| Part Number | CYSKY Seatpost 33.9 |
| Size | 27.2mm to 33.9mm |

## Product Details

- **Color:** 27.2-33.9mm
- **Item Weight:** 0.05 Kilograms
- **Material:** Aluminum
- **Brand:** CYSKY
- **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

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Justo adaptador
  

*by G***O on Reviewed in the United States on May 31, 2023*

Impecable

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Works like it should
  

*by J***R on Reviewed in the United States on January 31, 2023*

Smooth as butter

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Works exactly as intended
  

*by V***R on Reviewed in the United States on October 10, 2021*

Installed easily in seconds just as one would expect and is working fine on my grandson's bike. I was a little unsure if my measurements were accurate, even using a digital micrometer, but apparently they were.  I have to wonder if the negative commenters were measuring accurately and/or if their seat post or frame mounting hole were slightly off from industry standards.  Either way, they don't mention if a competitor's product worked better for them, so one has to wonder if this product was the wrong solution for their fitment issues.

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---

*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-18*