---
product_id: 501576841
title: "Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm"
brand: "funn"
price: "€ 143.79"
currency: EUR
in_stock: true
reviews_count: 13
category: "Funn"
url: https://www.desertcart.sk/products/501576841-funn-rsx-mountain-bike-direct-mount-bike-stem-with-31
store_origin: SK
region: Slovakia
---

# Adjustable extension 45-50mm with 20/30mm rise 6061 aerospace-grade alloy CNC precision Designed for dual crown forks, downhill-ready Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm

**Brand:** funn
**Price:** € 143.79
**Availability:** ✅ In Stock

## Summary

> 🚵‍♂️ Upgrade your ride with precision and style—because your bike deserves the best stem in the game!

## Quick Answers

- **What is this?** Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm by funn
- **How much does it cost?** € 143.79 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/501576841-funn-rsx-mountain-bike-direct-mount-bike-stem-with-31)

## Best For

- funn enthusiasts

## Why This Product

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

## Key Features

- • **Pro-Level Finish:** Shiny anodized blue finish that catches the light and elevates your bike’s aesthetic game.
- • **Sleek Split Design:** Two-piece lightweight stem offers superior handlebar clearance for large displays or phone mounts.
- • **Aerospace-Grade Strength:** Crafted from 6061 alloy for unmatched durability and featherlight weight.
- • **Dual Crown Compatibility:** Engineered specifically for dual crown forks—ideal for aggressive downhill and off-road adventures.
- • **Tailored Fit, Zero Compromise:** Adjustable 45-50mm extension with dual rise options to perfectly match your ride style.

## Overview

The Funn RSX Mountain Bike Direct Mount Stem is a precision CNC-machined, aerospace-grade 6061 alloy component designed for dual crown forks. Featuring an adjustable extension from 45 to 50mm and a 20mm rise, it offers a perfect fit for 31.8mm handlebars. Lightweight yet durable, its split two-piece design provides ample space for large displays or phone mounts, making it a top choice for serious downhill and off-road cyclists seeking both performance and style.

## Description

desertcart.com : Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm with 20mm Rise (Blue) : Sports & Outdoors

Review: If it’s good enough for surronster it’ll be good enough for you - What can I say that the title doesn’t already i bought the 30mm & the grey colorway the grey is way more shiney than the picture shows which is nice if you like more shiney parts or bad if you prefer more matte look personally the shiney is cool catches the light nicely, 30mm was suggested by the manufacturer for a surron this will fit a talaria mx4 &/or talaria XXX those are the only bikes I have to test but obviously works with surron as well i cant speak to something like a throne srpent or anything like those. But overall i like how much space there is in the middle if you have a large display or a phone mount, additionally they feel great nice & durable the machining feels superb & not to heavy & not to light just perfect now I don't take this off road it is a pavement princess but i know surronster has taken these offroad many times so im sure these will hold up just fine they wouldn’t make a special size if they werent confident it wouldnt hold up
Review: Looks great - Works great on my talaria x3 and comes with all the hardware

## Features

- Ensure Proper Fit with The RSX : The RSX is available for handlebars with a 31.8mm or 35mm diameters. This version is 31.8mm only. Please check your handlebar before purchasing and ensure you order the correct version.
- The RSX Direct Mount Stem is specifically designed to be used with a dual crown fork, making it a great choice for those in need of a stem for their off-road or downhill bike.
- RSX bike stem is precision CNC manufactured from 6061 aerospace grade alloy to provide a lot of support and rigidity, while keeping the weight as low as possible.
- Adjustable Extension : It is a beautifully simple yet brutally tough bike component, featuring built-in adjustment to offer 45mm and 50mm lengths with 20mm and 30mm rise.
- Choose the 31.8mm bar bore and 30mm rise model of the RSX Direct Mount Stem for a reliable and stylish upgrade to your Sur Ron bike.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B076PSMVZ2 |
| Best Sellers Rank | #32,661 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #5 in Bike Stems |
| Brand Name | Funn |
| Color | Blue |
| Country of Origin | Taiwan |
| Customer Reviews | 4.7 4.7 out of 5 stars (205) |
| Date First Available | June 19, 2019 |
| Item Package Dimensions L x W x H | 10.59 x 2.76 x 2.6 inches |
| Manufacturer | FUNN |
| Package Weight | 0.22 Kilograms |
| Part Number | HS16RX045G20-10 |
| Size | 20mm rise |
| Sport Type | Cycling |

## Product Details

- **Brand:** Funn
- **Color:** Blue
- **Item Weight:** 0.14 Kilograms
- **Manufacturer:** FUNN
- **Material:** Metal

## Images

![Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm - Image 1](https://m.media-amazon.com/images/I/51lzN4E6xIL.jpg)
![Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm - Image 2](https://m.media-amazon.com/images/I/61o-zRRsbCL.jpg)
![Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm - Image 3](https://m.media-amazon.com/images/I/7156o+dIyxL.jpg)
![Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm - Image 4](https://m.media-amazon.com/images/I/71MTqtUUUwL.jpg)
![Funn RSX Mountain Bike Direct Mount Bike Stem with 31.8mm Bar Clamp, 2 Pieces Lightweight Split Design for Dual Crown Forks, Adjustable Extension 45-50mm - Image 5](https://m.media-amazon.com/images/I/71e8RXeTZ2L.jpg)

## Questions & Answers

**Q: What size are the bolts?**
A: The bolt is M6 with 20mm thread section with 1mm washer.

**Q: Does it come with bolts?**
A: Yes.

## Customer Reviews

### ⭐⭐⭐⭐⭐ If it’s good enough for surronster it’ll be good enough for you
*by A***S on December 29, 2025*

What can I say that the title doesn’t already i bought the 30mm & the grey colorway the grey is way more shiney than the picture shows which is nice if you like more shiney parts or bad if you prefer more matte look personally the shiney is cool catches the light nicely, 30mm was suggested by the manufacturer for a surron this will fit a talaria mx4 &/or talaria XXX those are the only bikes I have to test but obviously works with surron as well i cant speak to something like a throne srpent or anything like those. But overall i like how much space there is in the middle if you have a large display or a phone mount, additionally they feel great nice & durable the machining feels superb & not to heavy & not to light just perfect now I don't take this off road it is a pavement princess but i know surronster has taken these offroad many times so im sure these will hold up just fine they wouldn’t make a special size if they werent confident it wouldnt hold up

### ⭐⭐⭐⭐⭐ Looks great
*by D***N on November 3, 2025*

Works great on my talaria x3 and comes with all the hardware

### ⭐⭐⭐⭐⭐ Good quality
*by A***R on January 8, 2026*

He loved the parts for his. Ike

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-01*