---
product_id: 560137161
title: "Alloy Bike Seatpost Reducer Shim, Length 100mm | Aluminum reducing sleeve seat post tube adapter for MTB, mountain, city and road bikes"
brand: "cogster"
price: "€ 20.64"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.hr/products/560137161-alloy-bike-seatpost-reducer-shim-length-100mm-aluminum-reducing-sleeve
store_origin: HR
region: Croatia
---

# Tool-free install Lightweight design CNC'd 6061 alloy Alloy Bike Seatpost Reducer Shim, Length 100mm | Aluminum reducing sleeve seat post tube adapter for MTB, mountain, city and road bikes

**Brand:** cogster
**Price:** € 20.64
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Elevate Your Ride with Precision and Style!

## Quick Answers

- **What is this?** Alloy Bike Seatpost Reducer Shim, Length 100mm | Aluminum reducing sleeve seat post tube adapter for MTB, mountain, city and road bikes by cogster
- **How much does it cost?** € 20.64 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/560137161-alloy-bike-seatpost-reducer-shim-length-100mm-aluminum-reducing-sleeve)

## Best For

- cogster enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Crafted from aerospace-grade aluminum for unmatched strength and corrosion resistance.
- • **Enhanced Comfort:** Adjust saddle height and tilt for a personalized riding experience.
- • **Effortless Installation:** No tools required—install in seconds without damaging your bike.
- • **Perfect Fit, Every Time:** Easily adapts smaller seatposts to larger tubes for a seamless fit.
- • **Universal Compatibility:** Fits a range of bike types—MTB, road, and city bikes alike.

## Overview

The Alloy Bike Seatpost Reducer Shim is a versatile adapter designed to fit various seatpost diameters, ensuring a secure and comfortable riding experience. Made from durable 6061 aluminum, it offers lightweight strength and easy installation, making it an essential accessory for any cyclist looking to enhance their bike's performance.

## Description

Alloy Bike Seatpost Reducer Shim, 100mm Length Aluminum Bicycle Reducing Sleeve Seat Post Tube Adapter for MTB,Mountain,City Bike,Road Bike

## Features

- Cogster Bike Seatpost Adapter Shim serves as a crucial part that adapts smaller seatposts to larger tubes, ensuring a proper fit.
- Comes in various sizes to accommodate different bicycle seatpost diameters and seat tube diameters.
- CNC'd from 6061 aerospace alloy, this bike seatpost shim balances superior strength, light weight, and corrosion resistance for long-term use.
- Featuring tool-free installation, this bicycle seat post tube adapter is designed to avoid damage to the bike frame or seatpost, ensuring ease and safety.
- By enabling the use of a different size seatpost, you can adjust the height or tilt of your saddle more accurately, thus improving your overall cycling comfort and performance.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Package Dimensions L x W x H | 6.14 x 4.17 x 1.38 inches |
| Package Weight | 0.05 Kilograms |
| Brand Name | COGSTER |
| Warranty Description | 2 Years |
| Model Name | CSS10-01 |
| Color | Black |
| Material | Aluminum |
| Suggested Users | unisex-adult |
| Manufacturer | COGSTER |
| Part Number | CSS10-01 |
| Included Components | Seatpost Reducer Shim |
| Size | 31.6 to 34.9mm |

## Images

![Alloy Bike Seatpost Reducer Shim, Length 100mm | Aluminum reducing sleeve seat post tube adapter for MTB, mountain, city and road bikes - Image 1](https://m.media-amazon.com/images/I/715afcUAShL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Took a 30.9 post to 31.6 effortlessly
  

*by N***S on Reviewed in the United States on January 25, 2024*

I needed a shorter dropper than the 31.6 mm/150 mm that came with my Santa Cruz Chameleon.  I had a perfectly good 30.9 post in 125 mm and this adapter allowed me to use that and save the cost of a new dropper.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Stumpjumper Evo
  

*by J***N on Reviewed in the United States on November 27, 2023*

Exactly what I needed to fit my 31.6 transfer post into my stumpjumper evo, good quality and fits great

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Affordable and fits properly.
  

*by W***. on Reviewed in the United States on November 4, 2023*

It was cheap and made my smaller dropper post fit my bike with no wiggle.

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**Shop now:** [https://www.desertcart.hr/products/560137161-alloy-bike-seatpost-reducer-shim-length-100mm-aluminum-reducing-sleeve](https://www.desertcart.hr/products/560137161-alloy-bike-seatpost-reducer-shim-length-100mm-aluminum-reducing-sleeve)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-09-21*