---
product_id: 454799028
title: "Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size"
brand: "neco"
price: "€ 29.27"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.gr/products/454799028-neco-headset-expander-top-cap-star-nut-plug-bolt-stem
store_origin: GR
region: Greece
---

# Premium Carbon Fiber Strong Compression Large Size Options Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size

**Brand:** neco
**Price:** € 29.27
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Elevate Your Ride with Neco's Premium Expander!

## Quick Answers

- **What is this?** Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size by neco
- **How much does it cost?** € 29.27 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/454799028-neco-headset-expander-top-cap-star-nut-plug-bolt-stem)

## 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

- • **Precision Fit:** Designed for 1” and 1-1/8” tubes, accommodating a wide range of bicycles.
- • **Sleek Aesthetics:** Carbon cap version adds a touch of elegance to your ride.
- • **Versatile Sizing:** Available in 2-inch and 3-inch depths, perfect for various cycling needs.
- • **Quality Assurance:** 100% original Neco components guarantee durability and performance.
- • **Unmatched Strength:** Engineered for maximum compression, ensuring your carbon tube stays protected.

## Overview

The Neco Headset Expander Top Cap is a high-quality compression plug designed specifically for carbon tubes, offering superior strength and protection. Available in multiple sizes, it ensures a perfect fit for various bicycle types while enhancing the aesthetic appeal with its sleek carbon fiber design.

## Description

Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size

## 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 |
| Fastener Type | Acorn |
| Thread Size | 1 inch |
| Exterior Finish | Aluminum |
| Color | Silver |
| Metal Type | Aluminum |
| Drive System | Star |
| Brand | Neco |
| Item Weight | 70 Grams |
| Thread Type | Unified National Coarse |
| Inside Thread Size | 1-1/8 inch |
| Thread Style | UNC |
| Thread Coverage | Fully Threaded |
| Thread Class | Coarse |
| Size | Large Aluminum Cap 1-1/8 inch |
| Head Style | Flat |
| Item Diameter | 25.4 Millimeters |
| Compatible groove diameter | 1 Inches |
| Manufacturer | Neco |
| Item Package Dimensions L x W x H | 3.82 x 2.72 x 1.14 inches |
| Package Weight | 0.07 Kilograms |
| Brand Name | Neco |
| Part Number | expanderSA |

## Product Details

- **Material:** Aluminum
- **Fastener Type:** Acorn
- **Thread Size:** 1 inch
- **Exterior Finish:** Aluminum
- **Color:** Silver

## Images

![Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size - Image 1](https://m.media-amazon.com/images/I/61-gSdJSgEL.jpg)
![Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size - Image 2](https://m.media-amazon.com/images/I/71fmTLV9mkL.jpg)
![Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size - Image 3](https://m.media-amazon.com/images/I/71aHzQG7zAL.jpg)
![Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size - Image 4](https://m.media-amazon.com/images/I/61Bd1uWqd0L.jpg)
![Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size - Image 5](https://m.media-amazon.com/images/I/61np7QGk8sL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    Carbon Steer Tube?  GET THIS ITEM!!!
  

*by W***Y on Reviewed in the United States on 9 May 2022*

Buy the long one. Trust me.  My Marin gravel bike has a carbon steer tube. The expansion plug that came with it only went about 1 inch (25mm) into the steer tube. My stem sits well below this and was therefore clamped onto an unsupported area of steer tube. The long option is about 3 inches long and goes well past the top bearing.  Exactly what I wanted. No worries about crushing carbon steer tube.  Expansion plug comes dry, not greased. Pull it apart and add some heavy duty/wheel bearing grease on THE INSIDE sliding/metal to metal contact areas of plug to improve installation. Do not put grease on outside of plug. Use a torque wrench.

### ⭐⭐⭐⭐⭐ 







  
  
    Best choice for carbon steerer tubes
  

*by O***1 on Reviewed in the United States on 31 December 2020*

Ok, to be honest, it’s also your only real choice for carbon steerer tubes in 1”. There are a few alternatives for 1 1/8”, but this is all I could find for 1”. That being said it really does work well. It catches the sides with enough force to wedge itself in without deforming the tube, which would result in a fork that will be headed to the trash heap. Keep in mind that you still need to torque the bolt carefully. Applying too much force would be catastrophic. I was careful and on the second go I got it perfect . All I had left was to tighten the top cap screw down correctly to get rid of all the play in the fork.

### ⭐⭐⭐ 







  
  
    you must have an expander in a carbon steering tube, ALWAYS USE A TORQUE WRENCH !!!
  

*by V***O on Reviewed in the United States on 13 November 2020*

ALWAYS USE A TORQUE WRENCH, mixed review, I did return for two reasons. 1) has a lip so it stays at the top of the steering tube, I wanted it down a little for fitting purpose. 2) slipped up when I tried to preload the steering bearings to 1.8 Nm, I should have tightened the plug to 8-9 Nm, NOT 6-7 Nm. These plugs with more surface area require more torque, not in the instructions. Smaller plugs require less torque to hold, too much torque on a small plug could distort the steering tube.

## Frequently Bought Together

- Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size
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**Shop now:** [https://www.desertcart.gr/products/454799028-neco-headset-expander-top-cap-star-nut-plug-bolt-stem](https://www.desertcart.gr/products/454799028-neco-headset-expander-top-cap-star-nut-plug-bolt-stem)

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-03-26*