---
product_id: 181112877
title: "Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size (Extra Large Alu Cap 1-1/8)"
brand: "neco"
price: "€ 28.66"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.it/products/181112877-headset-expander-top-cap-star-nut-plug-bolt-stem-expanding
store_origin: IT
region: Italy
---

# 2-3 inch expander depth Strong compression force Carbon fiber & aluminum protection Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size (Extra Large Alu Cap 1-1/8)

**Brand:** neco
**Price:** € 28.66
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Elevate your ride with Neco’s powerhouse headset expander — because your bike deserves the best!

## Quick Answers

- **What is this?** Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size (Extra Large Alu Cap 1-1/8) by neco
- **How much does it cost?** € 28.66 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/181112877-headset-expander-top-cap-star-nut-plug-bolt-stem-expanding)

## Best For

- neco enthusiasts

## Why This Product

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

## Key Features

- • **Lightweight Yet Heavy-Duty:** Balances robust durability with minimal weight—large size weighs just 75g for peak performance.
- • **Tailored Fit for Every Ride:** Available in 1” and 1-1/8” sizes with large and extra-large expanders to perfectly match your bike’s specs.
- • **Sleek Carbon Fiber Aesthetic:** Choose the carbon cap for a high-end, lightweight look that turns heads on every trail.
- • **Trusted Legacy of Excellence:** Backed by 30+ years of Neco’s precision engineering and quality craftsmanship.
- • **Unmatched Carbon & Aluminum Protection:** Engineered to safeguard your premium carbon or aluminum fork with superior compression strength.

## Overview

The Neco Headset Expander Top Cap is a premium compression plug designed for both carbon fiber and aluminum bike forks. Offering sizes for 1” and 1-1/8” tubes with expander depths of 2 and 3 inches, it ensures a secure, strong fit that protects your frame. Featuring carbon fiber and aluminum cap options, this lightweight yet durable component is crafted with over 30 years of Neco’s expertise, making it ideal for serious cyclists seeking reliability and style.

## Description

Neco Bike Headset Compression Top Cap, 1 inch and 1 1/8’’ Expander Nut PlugThe Neco headset compressor nut is best expander for your carbon bike and aluminum bike. While other headset star nut is only for metal fork tube, not works with carbon fiber tube. Neco is world class bike components supplier with over 30 years history. FEATURESSTRONG COMPRESSOR - Compression plug is good for carbon tube and aluminum tube, it offers stronger force and can protect the carbon tube as well. (Ordinary star nut is only for metal tube)LARGE SIZE - Bigger compressor is more stronger and safety. We offer expander depth 2 inch and 3 inch. 2 inch is large size, 3 inch in extra large. We recommend 2 inch for most scenario. Strong enough but budget cost1” & 1 - 1/8” - Small size is for 1” tube, fork inner diameter 20-22.2mm. Middle & large & extra large is for 1-1/8”, fork inner diameter 22-25.4mmCabon cap version looks very great. We recommend large size and cabon cap. Aluminum cap offered as wellNeco 100% original, high quality components and surface treatment, excellent strength for all heavy duty cyclingWeight: small size 40g, middle 45g, large 75g, extra large 85gAbout Neco NECO - Professional Bike Parts Manufacturers Neco Technology Industry Co. Ltd., founded in 1986, have been in the forefront of machinery tooling design and development. Having acquired more than 30 years of experience in the cycling field.Neco will always strive to meet the commitments to all of the customers and provide competitive, high-value products.

## Features

- STRONG COMPRESSOR - Compression plug is good for carbon tube, it offers stronger force and can protect the carbon tube as well. (Star nut is only for aluminum tube)
- LARGE SIZE - Bigger compressor is more stronger and safety. We offer expander depth 2 inch and 3 inch. 2 inch is large size, 3 inch in extra large. We recommend 2 inch for most scenario. Strong enough but budget cost
- 1” & 1 - 1/8” - Small size is for 1” tube,inner diameter 20-22.2mm. Middle & large & extra large is for 1-1/8”, inner diameter 22-25.4mm
- Cabon cap version looks very great. We recommend large size and cabon cap. Aluminum cap offered as well
- Neco 100% original, high quality components and surface treatment, excellent strength for all heavy duty cycling

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Aluminum, Carbon Fiber |
| Fastener Type | Acorn |
| Exterior Finish | Aluminum |
| Color | Extra Large Alu cap 1-1/8 |
| Metal Type | Aluminum |
| Brand | Neco |
| Item Weight | 70 Grams |
| Inside Thread Size | M22 |
| Size | Extra Large Alu Cap 1-1/8 |
| Item Diameter | 25.4 Millimeters |
| UPC | 782899743878 |
| Manufacturer | Neco |
| Item Package Dimensions L x W x H | 4.76 x 3.31 x 1.22 inches |
| Package Weight | 0.09 Kilograms |
| Brand Name | Neco |
| Part Number | headset compression nut |

## Product Details

- **Material:** Aluminum, Carbon Fiber
- **Fastener Type:** Acorn
- **Exterior Finish:** Aluminum
- **Color:** Extra Large Alu cap 1-1/8
- **Metal Type:** Aluminum

## Images

![Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size (Extra Large Alu Cap 1-1/8) - Image 1](https://m.media-amazon.com/images/I/61-gSdJSgEL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent!
*by M***T on March 3, 2023*

These work really well, and they have a feature that at least some competitors do not, and its a big help.Its something you wouldn't really think of until you use a competing product that doesn't have it. These expanders work by expanding until they press against the interior of your carbon fiber steering tube. So what happens when you loosen the expander and thus shrink it? With a different brand... the expander lost its tension against the steering tube and fell right down to the bottom of it.The Neco expander has a lip on its top that fits over the top of your steering tube. It prevents this from happening. It also ensures a specific, consistent position for the cap.Its not a big deal until you work with an expander that doesn't have this, which I had two of (they were different brands, too). A very nice convenience and an expander cap that, beyond this, is made of what appear to be top quality parts.

### ⭐⭐⭐⭐⭐ Worked perfectly
*by B***S on October 30, 2023*

I was a little concerned by the people who posted reviews saying this compression plug slipped, even when torqued to spec. But, I decided to take a chance because I wanted something longer than usual in order to provide extra strength to the carbon steer tube.As it turned out, this design is no different than any other (except for the length). It is made well, and has a surface that is textured to grip well on the inside of the steer tube. It worked as expected, and just as well as any other.I question whether the people who said it slipped were in fact applying too much torque to the cap screw. Too much torque would definitely cause even a properly secured expanding compression plug to slip, but it's important to know that very little torque is actually needed when tightening down the capscrew. Apply just enough to prevent the headset from knocking. On my bike that was only about 3 N-m. Any more and you'll ruin your headset (the bearings).One other thing, the title -- Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut -- is incorrect because this is neither a headset, nor a star nut. A better title might be "Neco Steertube Compression Plug / Expanding Nut, includes top cap".

### ⭐⭐⭐⭐ Works great.
*by E***E on June 15, 2023*

I bought the long one for my carbon steerer tube, and it is working fine with the extension I put on. I figure it'll give the tube some beef to strengthen it.

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-03-18*