---
product_id: 258773415
title: "Motorcycle Silver 21.1mm (0.83\") Aluminum Threadless QUILL STEM Adapter Bike Bicycle"
brand: "motorcycle"
price: "$65"
currency: NZD
in_stock: true
reviews_count: 6
category: "Motorcycle"
url: https://www.desertcart.nz/products/258773415-motorcycle-silver-21-1mm-0-83-aluminum-threadless-quill-stem
store_origin: NZ
region: New Zealand
---

# 28.6mm stem clamp compatibility 21.1mm steerer fit precision Durable lightweight aluminum alloy Motorcycle Silver 21.1mm (0.83") Aluminum Threadless QUILL STEM Adapter Bike Bicycle

**Brand:** motorcycle
**Price:** $65
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your ride with precision and style!

## Quick Answers

- **What is this?** Motorcycle Silver 21.1mm (0.83") Aluminum Threadless QUILL STEM Adapter Bike Bicycle by motorcycle
- **How much does it cost?** $65 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/258773415-motorcycle-silver-21-1mm-0-83-aluminum-threadless-quill-stem)

## Best For

- motorcycle enthusiasts

## Why This Product

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

## Key Features

- • **Sleek Silver Finish:** Polished look that elevates your bike’s aesthetic while signaling quality craftsmanship.
- • **Revive Vintage Rides:** Perfect for modernizing classic bikes with contemporary handlebars and stems.
- • **Premium Aluminum Alloy:** Crafted from lightweight yet robust aluminum for lasting durability and corrosion resistance.
- • **Seamless Compatibility:** Fits 21.1mm (0.83") steerer tubes with 28.6mm (1 1/8") stem clamp for versatile upgrades.
- • **Effortless Installation:** Snap-in design ensures quick, hassle-free setup—get back on the road faster.

## Overview

The Motorcycle Silver 21.1mm Aluminum Threadless Quill Stem Adapter is a precision-engineered bike part designed to convert older quill stems to modern threadless setups. Made from durable aluminum alloy, it fits 21.1mm steerer tubes and 28.6mm stem clamps, enabling seamless compatibility and easy installation. Ideal for cyclists looking to refresh vintage bikes with contemporary handlebars and stems, this adapter combines functionality with a sleek silver finish.

## Description

Silver 21.1mm (0.83") Aluminum Threadless Quill Stem Adapter. Premium Quality, Made in Taiwan

Review: Works great - It installed in a snap. It looks great, and seems like good quality.
Review: Fixed a bike - I should have taken a picture. I used this to put new, wider, riser bars on an old 90's MTB my son is using to commute at school. The old quill stem had been bent at some point over the last 30 years, and it made it a bit awkward to ride. I also bought a new stem with less reach and a better angle, it's much more comfortable now. I might buy another one for an old 27" roadbike that has terrible old steel drop bars, but that's for another day.

## Features

- Aluminum Threadless Quill Stem Adapter (For Ahead)
- Fork Steerer Inside Diameter: 21.1mm/ 0.83"
- Ahead Diameter (Stem Clamp): 28.6mm (1 1/8")
- 28.6mm (Upper part) tap down to 21.1mm (Lower part)
- Aluminum Alloy

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Package Dimensions L x W x H | 6.97 x 4.41 x 1.1 inches |
| Package Weight | 0.2 Kilograms |
| Item Weight | 0.2 Kilograms |
| Brand Name | Motorcycle |
| Part Number | Motorcycle |

## Images

![Motorcycle Silver 21.1mm (0.83") Aluminum Threadless QUILL STEM Adapter Bike Bicycle - Image 1](https://m.media-amazon.com/images/I/71REkoqnJ2L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by J***L on September 22, 2023*

It installed in a snap. It looks great, and seems like good quality.

### ⭐⭐⭐⭐⭐ Fixed a bike
*by L***S on October 24, 2024*

I should have taken a picture. I used this to put new, wider, riser bars on an old 90's MTB my son is using to commute at school. The old quill stem had been bent at some point over the last 30 years, and it made it a bit awkward to ride. I also bought a new stem with less reach and a better angle, it's much more comfortable now. I might buy another one for an old 27" roadbike that has terrible old steel drop bars, but that's for another day.

### ⭐ Loose fit
*by S***G on May 18, 2025*

Looks good but I agree with the other guy who said it spins even when tightened. It’s slightly undersized compared to a known good 21.1mm stem, calipers to 20.9, and while it might seem small that 0.2 makes the difference. Especially when considering the loose tolerances on the old bikes this fits.

## Frequently Bought Together

- Silver 21.1mm (0.83") Aluminum Threadless QUILL STEM Adapter Bike Bicycle
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**Shop now:** [https://www.desertcart.nz/products/258773415-motorcycle-silver-21-1mm-0-83-aluminum-threadless-quill-stem](https://www.desertcart.nz/products/258773415-motorcycle-silver-21-1mm-0-83-aluminum-threadless-quill-stem)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-02*