---
product_id: 3379156
title: "M-Wave Seatpost Clamp with Rack Mounts"
brand: "m-wave"
price: "€ 44.00"
currency: EUR
in_stock: true
reviews_count: 13
category: "M Wave"
url: https://www.desertcart.fr/products/3379156-m-wave-seatpost-clamp-with-rack-mounts
store_origin: FR
region: France
---

# Ultra-light 37g alloy 31.8mm precision fit Includes Allen screws M-Wave Seatpost Clamp with Rack Mounts

**Brand:** m-wave
**Price:** € 44.00
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Elevate your ride with the ultimate rack-ready seatpost clamp — because your bike deserves more.

## Quick Answers

- **What is this?** M-Wave Seatpost Clamp with Rack Mounts by m-wave
- **How much does it cost?** € 44.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/3379156-m-wave-seatpost-clamp-with-rack-mounts)

## Best For

- m-wave enthusiasts

## Why This Product

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

## Key Features

- • **Sleek Stealth Black:** Matte black finish blends effortlessly with any bike frame for a clean, professional look.
- • **Featherweight Strength:** Crafted from durable alloy, weighing just 37 grams without compromising toughness.
- • **Rack-Ready Reinvention:** Seamlessly add a rear rack with built-in threaded eyelets for ultimate cargo versatility.
- • **Load-Tested Reliability:** Engineered to handle up to 1000 PSI tensile strength, ensuring your gear stays secure.
- • **Precision Fit Guarantee:** Designed for 31.8mm seat tubes with included hardware for hassle-free installation.

## Overview

The M-Wave Seatpost Clamp with Rack Mounts is a lightweight (37g) alloy clamp designed for 31.8mm seat tubes, featuring integrated threaded eyelets and included Allen screws to securely attach rear racks. Its sleek black finish ensures a seamless look, while its robust construction supports up to 1000 PSI tensile strength, making it the perfect upgrade for cyclists seeking reliable cargo solutions without compromising style or weight.

## Description

This is a unique seat tube clamp from M-Wave. It contains threads to provide you with another fixation point for a rear rack. This is the kind of innovation you've come to expect from M-Wave.

Review: Works Great! Know your bike before buying! - This does exactly what I wanted to do. It's strong and fit perfectly. I saw some bad reviews about people feeling like they didn't get the proper size. Please be aware that your seatpost size IS NOT the size to get for this clamp. If you can't find your seatpost clamp size online, contact the manufacturer to ask. My seatpost is something like 27.6mm, but the clamp I needed to get was 31.8mm. As soon as I got it in the mail I checked the size and it was a perfect fit. The only other thing to consider is if your bike frame is designed and rated to handle the abuse of a rear rack and cargo. Sometimes the bike doesn't have the eyelets because it's not meant to carry cargo, so if you're not sure, contact your bike manufacturer to ask. Trek was happy to help me, and it only took a out 5 minutes to get all the info I needed to feel safe getting this and putting a rack on. In case anyone is wondering, I put this on a 2023 Trek FX Sport 6, which is a full carbon fiber frame hybrid bike that is meant to handle moderate gravel and trails. It has eyelets lower on the frame near the cassette for a rack but not on the frame near the seatpost where you'd usually have eyelets for a rear rack, so this product was exactly what I needed.
Review: solution to lack of attachment points on trek 7100 multitrack - This was the exact adapter we needed to attach a rear rack on a trek hybrid 7100 multitrack (2004 model). I will upload a photo to show our set-up. The bike itself doesn't have the typical attach points, and for years, I just used a backpack to haul. But now that my tween is using my bike as a daily commuter to his school, we needed a solution for. Happy to report that this was an exact fit for our seatpost. In order to figure out the correct size, I used a flexible tape measure (like a tailor would use) and measured the circumference. (you could also do this with a narrow strip of paper and then just use a regular ruler to measure the length.) Then some math to solve for the diameter: C=2 * pi * r ==> Diameter = circumference divided by pi (3.14). Then if you need to convert inches to millimeters, multiply inches by 2.54 to get your cm, then move that decimal and voila! (There's online calculators to do all of this for you, too.) This is solid and well made piece. It was easy to install and the hardware that came with his rack threaded in perfectly.

## Features

- Allows for another fixation point for your rear rack
- All the functionality of an M-Wave seat tube clamp
- Black in color to make it blend in nicely with your bike
- Eyelets for rear rack, Allen screws included
- Weighs less than 35 grams
- Alloy seat clamp with threads for luggage carrier fixation
- 37g

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001V537I0 |
| Best Sellers Rank | #150,306 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #47 in Bike Seat Clamps |
| Brand | M-Wave |
| Brand Name | M-Wave |
| Color | Black |
| Customer Reviews | 4.3 4.3 out of 5 stars (605) |
| Date First Available | March 4, 2009 |
| Global Trade Identification Number | 04015493250784 |
| Item Dimensions LxWxH | 11.81 x 11.81 x 11.81 inches |
| Item Package Dimensions L x W x H | 5.04 x 3.78 x 1.34 inches |
| Item Weight | 0.04 Kilograms |
| Item dimensions L x W x H | 11.81 x 11.81 x 11.81 inches |
| Manufacturer | Cycle Force Group |
| Material | Metal |
| Model Year | 2018 |
| Package Weight | 0.05 Kilograms |
| Part Number | Cicli Bonin_CMC633 |
| Size | 31.8mm |
| Sport Type | Cycling |
| Style | Unique |
| Tensile Strength | 1000 Pounds Per Square Inch |
| UPC | 698238400503 |

## Product Details

- **Brand:** M-Wave
- **Color:** Black
- **Global Trade Identification Number:** 04015493250784
- **Item Weight:** 0.04 Kilograms
- **Item dimensions L x W x H:** 11.81 x 11.81 x 11.81 inches
- **Manufacturer:** Cycle Force Group
- **Material:** Metal
- **Style:** Unique
- **Tensile Strength:** 1000 Pounds Per Square Inch
- **UPC:** 698238400503

## Images

![M-Wave Seatpost Clamp with Rack Mounts - Image 1](https://m.media-amazon.com/images/I/51F+qbtv9KL.jpg)
![M-Wave Seatpost Clamp with Rack Mounts - Image 2](https://m.media-amazon.com/images/I/51r+udFYE1L.jpg)
![M-Wave Seatpost Clamp with Rack Mounts - Image 3](https://m.media-amazon.com/images/I/61D8rBnmQ2L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works Great! Know your bike before buying!
*by B***H on June 23, 2023*

This does exactly what I wanted to do. It's strong and fit perfectly. I saw some bad reviews about people feeling like they didn't get the proper size. Please be aware that your seatpost size IS NOT the size to get for this clamp. If you can't find your seatpost clamp size online, contact the manufacturer to ask. My seatpost is something like 27.6mm, but the clamp I needed to get was 31.8mm. As soon as I got it in the mail I checked the size and it was a perfect fit. The only other thing to consider is if your bike frame is designed and rated to handle the abuse of a rear rack and cargo. Sometimes the bike doesn't have the eyelets because it's not meant to carry cargo, so if you're not sure, contact your bike manufacturer to ask. Trek was happy to help me, and it only took a out 5 minutes to get all the info I needed to feel safe getting this and putting a rack on. In case anyone is wondering, I put this on a 2023 Trek FX Sport 6, which is a full carbon fiber frame hybrid bike that is meant to handle moderate gravel and trails. It has eyelets lower on the frame near the cassette for a rack but not on the frame near the seatpost where you'd usually have eyelets for a rear rack, so this product was exactly what I needed.

### ⭐⭐⭐⭐⭐ solution to lack of attachment points on trek 7100 multitrack
*by S***Y on November 30, 2025*

This was the exact adapter we needed to attach a rear rack on a trek hybrid 7100 multitrack (2004 model). I will upload a photo to show our set-up. The bike itself doesn't have the typical attach points, and for years, I just used a backpack to haul. But now that my tween is using my bike as a daily commuter to his school, we needed a solution for. Happy to report that this was an exact fit for our seatpost. In order to figure out the correct size, I used a flexible tape measure (like a tailor would use) and measured the circumference. (you could also do this with a narrow strip of paper and then just use a regular ruler to measure the length.) Then some math to solve for the diameter: C=2 * pi * r ==> Diameter = circumference divided by pi (3.14). Then if you need to convert inches to millimeters, multiply inches by 2.54 to get your cm, then move that decimal and voila! (There's online calculators to do all of this for you, too.) This is solid and well made piece. It was easy to install and the hardware that came with his rack threaded in perfectly.

### ⭐⭐⭐⭐⭐ Just what I needed!
*by C***S on June 13, 2025*

Works great, looks great, priced great! I highly recommend this, for adding a connection point for rear racks.

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-02-25*