---
product_id: 390085077
title: "PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter"
brand: "platt"
price: "KSh4742"
currency: KES
in_stock: true
reviews_count: 13
category: "Platt"
url: https://www.desertcart.co.ke/products/390085077-platt-bicycle-seatpost-shim-aluminum-alloy-bike-seat-post-tube
store_origin: KE
region: Kenya
---

# High-grade aluminum alloy, lightweight & corrosion-resistant 31.6 to 33.9 mm fit adapter 100mm extended length for superior support PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter

**Brand:** platt
**Price:** KSh4742
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Upgrade your ride’s backbone with precision and style!

## Quick Answers

- **What is this?** PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter by platt
- **How much does it cost?** KSh4742 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/products/390085077-platt-bicycle-seatpost-shim-aluminum-alloy-bike-seat-post-tube)

## Best For

- platt enthusiasts

## Why This Product

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

## Key Features

- • **Easy Installation:** Slide-in design ensures a perfect fit that feels custom-made—no tools, no hassle.
- • **Precision Fit Upgrade:** Seamlessly converts 31.6mm seatposts to 33.9mm frames—no more seatpost hunting.
- • **Durable Aluminum Build:** Crafted from premium aluminum alloy for strength without the weight penalty.
- • **Extended Support Length:** 100mm shim length offers unmatched stability inside your bike frame.
- • **Anti-Corrosion Reliability:** Engineered to resist rust and wear, keeping your ride smooth season after season.

## Overview

The PLATT Bicycle Seatpost Shim is a high-quality aluminum alloy adapter designed to convert a 31.6mm seatpost to fit a 33.9mm bike frame. At 100mm length, it provides enhanced support and stability compared to standard shims. Lightweight, durable, and corrosion-resistant, this shim eliminates the need to buy a new seatpost, making it a smart, cost-effective upgrade for cyclists seeking a perfect fit and reliable performance.

## Description

Shop PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter(31.6 to 33.9). Free delivery and returns on all eligible orders.

Review: absolutely perfect - Just what i wanted, did the job exactly as was required, was a perfect fit, slid in like it was made for it. worked perfectly. I used it on a bmx bike, which had a slightly larger diameter seat post tube than my seat post.
Review: Well engineered accessory. - Well engineered, sorted out my seat slippage problem as it replaced a plastic sleeve which was totally useless. Important to check frame diameter with vernier calipers and likewise with the seat post to be sure to order the correct size, internal and external.

## Features

- MATERIAL:This Bike Seatpost Shim is Made of High Quality Aluminum Alloy, it is Lightweight,Strong ,Durable and Great Anti-corrosion.
- SIZE: 31.6 to 33.9 ，Use this Bicycle Seatpost Shim,The 31.6 Seatpost can be converted into the 33.9 Seatpost.
- LEGHTH: 100mm , Our shims are made to 100mm length and are longer than other shims on the market, giving your seat post much better support inside the frame.
- TIP:Please Check or Measure the O.D of the Original Seatpost, OR Measure the I.D of the Bike Frame Seat Tube.Then make a Right Choice.
- APPLICATION:This Seatpost Shim can easily adjust the diameter of the bicycle seat post to fit a larger frame , eliminating the trouble of repurchasing the bike seatpost.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0965G998X |
| Batteries included? | No |
| Best Sellers Rank | 6,807 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 2 in Cycling Seat Posts |
| Bike type | Mountain Bike |
| Color | Black/White |
| Customer Reviews | 4.2 4.2 out of 5 stars (1,681) |
| Date First Available | 29 May 2021 |
| Item model number | ZUK-057 |
| Material type | Aluminium |
| Package Dimensions | 16.1 x 8 x 3.4 cm; 60 g |
| Size | 31.6 I.D/33.9 O.D |
| UPC | 721703542375 |

## Product Details

- **Brand:** PLATT
- **Colour:** Black/White
- **Item weight:** 0.06 Kilograms
- **Manufacturer:** PLATT
- **Material:** Aluminium

## Images

![PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter - Image 1](https://m.media-amazon.com/images/I/612LALH7BlS.jpg)
![PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter - Image 2](https://m.media-amazon.com/images/I/61OG55eGnBS.jpg)
![PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter - Image 3](https://m.media-amazon.com/images/I/61Y-oOTzGsS.jpg)
![PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter - Image 4](https://m.media-amazon.com/images/I/61h-EDcmqWL.jpg)
![PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter - Image 5](https://m.media-amazon.com/images/I/61kzSVZ0i8L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ absolutely perfect
*by A***A on 18 December 2024*

Just what i wanted, did the job exactly as was required, was a perfect fit, slid in like it was made for it. worked perfectly. I used it on a bmx bike, which had a slightly larger diameter seat post tube than my seat post.

### ⭐⭐⭐⭐⭐ Well engineered accessory.
*by S***I on 16 September 2025*

Well engineered, sorted out my seat slippage problem as it replaced a plastic sleeve which was totally useless. Important to check frame diameter with vernier calipers and likewise with the seat post to be sure to order the correct size, internal and external.

### ⭐⭐⭐⭐⭐ It works, to the... whatever is smaller than a millimeter! 😂
*by M***P on 4 June 2025*

A very, very tight fit. That is probably the fault of the other product - a manual, suspension dropper post. However, with some lithium grease on the shim and post, this has marvelously facilitated installation. Thank you Amazon and Platt. 🥳

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**Shop now:** [https://www.desertcart.co.ke/products/390085077-platt-bicycle-seatpost-shim-aluminum-alloy-bike-seat-post-tube](https://www.desertcart.co.ke/products/390085077-platt-bicycle-seatpost-shim-aluminum-alloy-bike-seat-post-tube)

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*Product available on Desertcart Kenya*
*Store origin: KE*
*Last updated: 2026-03-05*