Specialized Carbon Steerer Tube Plug bike headset expander

Name: Specialized Carbon Steerer Tube Plug bike headset expander
Brand: Specialized
SKU: 137583654
Price: 10.49 EUR
Availability: InStock
Rating: 5 (22 reviews)

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22 Reviews

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Long

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Features of Specialized Carbon Steerer Tube Plug

Trusted by over 25 million satisfied customers worldwide

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Specifications Specialized Carbon Steerer Tube Plug

Features of Specialized Carbon Steerer Tube Plug

Color Black

Color

Black

Product Type Expanders

Product Type

Expanders

Product description of Specialized Carbon Steerer Tube Plug bike headset expander

Description summary

Ensure the safety and integrity of your carbon fork with the genuine SPECIALIZED Carbon Steerer Tube Plug. Expertly engineered for both road and mountain bikes, this essential expander provides a secure anchor for precise headset adjustment, eliminating wobble and ensuring responsive steering. Its extended design distributes clamping force evenly, protecting your delicate carbon steerer from damage unlike traditional star nuts. For a perfectly tuned, rock-solid front end and complete peace of mind, trust in authentic Specialized quality. Spare parts - Headsets

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Spare parts - Headsets.

SPECIALIZED Carbon Steerer Tube Plug Expander.

To be used for either mountain or road carbon steerer tubes.

Ensure the safety, integrity, and performance of your high-end carbon fork with the genuine SPECIALIZED Carbon Steerer Tube Plug. This essential component is expertly engineered to provide a secure and reliable anchor point for preloading your headset bearings, a critical task that standard star nuts cannot safely perform on delicate carbon fiber. As a crucial element in the Headsets category, this expander is the definitive solution for any cyclist running a modern carbon steerer tube, whether you´re building a new dream bike, upgrading your fork, or replacing a worn or failing plug. Trust in Specialized engineering to protect your investment and deliver a perfectly tuned front end for every ride.

This headset expander is designed with the unique properties of carbon fiber in mind. Its primary function is to provide a solid internal brace against which the top cap can pull, allowing you to set the precise bearing preload required for smooth, responsive steering and eliminating frustrating headset play. By choosing the authentic SPECIALIZED plug, you are opting for a part designed for seamless integration and optimal performance with your Specialized equipment and other compatible forks.

Key Benefits
* Ultimate Carbon Steerer Protection: Unlike sharp star nuts that can score, crack, or crush carbon fiber, this expander plug distributes clamping force evenly over a large surface area. This design provides a powerful, slip-free grip without creating dangerous stress points, preserving the structural integrity of your expensive fork.
* Rock-Solid Headset Adjustment: Achieve precise and lasting headset preload. The robust design ensures that once set, your adjustment holds firm, eliminating headset wobble and ensuring a stable, confident feel through the handlebars. This translates to better handling on technical descents and more efficient power transfer during climbs.
* Versatile Cross-Discipline Performance: Engineered for excellence, this single expander is the perfect fit for both your Specialized road bike and mountain bike. Its reliable design meets the demands of high-mileage road cycling, aggressive trail riding, and everything in between, making it a versatile must-have in your collection of spare parts.
* Effortless Installation: The intuitive design allows for quick and straightforward installation and removal. It provides a dependable and reusable solution for bike maintenance, travel, or future upgrades, offering a significant advantage over single-use alternatives.

Main Features
* Extended Contact Design: Features an elongated expansion mechanism that maximizes contact with the inner wall of the steerer tube, ensuring superior grip and load distribution.
* Dependable Expansion System: Utilizes a proven multi-piece mechanism that provides a secure, non-slip fit, guaranteeing your top cap has a solid foundation to tighten against.
* Lightweight Engineering: Meticulously designed to be strong yet lightweight, ensuring it performs its critical function without adding any unnecessary weight to your performance-oriented bicycle.
* Genuine Specialized Quality: As an authentic Specialized spare part, it guarantees the fit, form, and function you expect from the brand, ensuring perfect compatibility and peace of mind.

Technical Specifications
* Product Type: Headset Expander / Compression Plug
* Category: Spare Parts
* Subcategory: Headsets
* Attribute: Expanders
* Compatibility: Designed for 1-1/8" carbon steerer tubes
* Application: Road, Mountain (MTB), Gravel, Cyclocross
* Function: Provides a secure internal anchor for headset bearing preload adjustment.

Specifications

Manual

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What our customers are saying about Specialized Carbon Steerer Tube Plug bike headset expander

This Specialized carbon steerer plug is praised for its quality workmanship and reliability. It´s a lightweight yet robust expander, weighing only 28 grams, that provides a very strong grip, preventing slipping unlike stock models. Its proper length and large contact surface make it a perfect, sturdy, and effective anchor for carbon forks, ensuring a rock-solid front end. Many consider it the best expansion plug on the market for its performance and design

Best one in the narket

2025/11/09

David

Excellent product. I wouldn´t use any other. I have used it multiple times on my bikes.

Qualification

2025/07/01

Elkin Javier

Good product

Specialized quality for a fair price

2024/12/01

Michael

Bought a non name brand for cheaper at first and the wedge threads stripped almost immediately. Then bought this one and it works like a charm with quality workmanship. You will not be disappointed with this one.

Great product

2024/11/01

philip-purdie

All as described with great quality, good price and (on this occasion) fast delivery.

Excellent product used immediately ok.

2024/05/07

dino

excellent product, used immediately OK.

Spec

2024/04/13

adam

excellent quality.

It works

2024/04/11

Funciona

Not all models work, this one does, I have bought several and it does its job.

Fantastic product!

2024/03/11

Ivan

Most reliable carbon steering plug I have ever used! Light yet a good length for clamping.

Expander

2023/11/21

Expander

A good, light and effective expander. I recommend.

Product as described

2023/08/16

Artur

Quickly and without problems.

Original article so it gives reliability

2023/05/28

Luis

Original Specialized item so it has an indisputable quality, EYE it's a pity that I bought it with another TradeInn item and I had to expect more than what is indicated both in the product sheets and at the time of purchase some are offered delivery times that are NOT real

Good product

2023/04/03

Txuma Arana

It is robust and meets the expectations

Specialized carbon

2022/03/05

Jérôme

Great product. It is the one that is essential for carbon pivots

Review

2021/11/24

Михаил

Excellent anchor, the best in its segment

Specialized carbon steerer tube plug

2021/09/03

Jempi

Perfect tube plug, cheap and sturdy. For me the best plug on the market

Best

2021/07/27

Guillaume

Possibly the market's best expansion plug, absolutely perfect. Proper length for most voices, holds in place into the tube itself with reasonably high tension on the steering bearing; and prevents pinching on carbon pipes when one wants the top right on the stem with no spacer in between.

Specialized Carbon Steer Plus

2021/05/28

Hal

Nice plug, light and the perfect length for my bike - only 2mm spacer above my stem.

Valid product

2021/05/13

Tony

Very very reliable I will buy another one as a spare

Product as described

2021/03/17

Martin Casavant

Product as described, will recommend if necessary

Great

2020/10/07

Nelson Abreu

Very good and cheap. It has a very strong grip. Excellent product.

Reliable

2020/09/01

Pablo

Light and at the same time with a large contact surface.

Solid hold, fairly light

2020/06/26

Matt

I was fed up of the stock expander constantly slipping and I’d read nothing but positive reviews of the Specialized one. The reviews were right, weighing only 28 grams it hold the steerer super tight, one rock solid front end now!

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What is the size/diameter?

2024/07/14

Mirjam

I would like to know what the size is, the diameter?

Answer of Dominik

Hello The diameter is 24mm. Best Regards.

length

2024/07/12

Giorgio

I would like to know the length

Answer of Dominik

Hi The total length will be 45 mm. Best regards

Weight of item?

2024/06/03

Martin

Just want to know weight of item, I'm in a rush, saw some I wanted that are 18g but believe lost in customs and want before 16th

Answer of Diaz Subires

Good afternoon hasty gentleman, Don´t worry that 5 g + limits your performance. Kind regards

Answer of Anthony

28 grams on my scale :)

Answer of marco

27 grams. Weighed on the scales

Answer of Bram

This one weighs ~27 grams. There is also an Aethos specific version with some cutouts and lighter bolts that weighs ~17 grams.

Plug and screw for the stem

2024/01/25

Andres

Does this expansion spider come with the plug and screw for the stem? All the best.

Answer of Adrián

It comes without the cap or the screw.

Answer of Anthony

No, that´s something you´ll have to purchase separately. What you get is exactly what´s pictured.

Answer of Lisa

No. It is just the expander as in the photo.

Answer of Arne

No, it is only the plug, so no top cap and screw. You only get what you see in the picture

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Specialized Carbon Steerer Tube Plug bike headset expander

Features of Specialized Carbon Steerer Tube Plug

Specialized - Spare parts - Headsets

Specifications Specialized Carbon Steerer Tube Plug

Features of Specialized Carbon Steerer Tube Plug

Color Black

Product Type Expanders

Product description of Specialized Carbon Steerer Tube Plug bike headset expander

Similar alternatives to this product

Related products viewed by other shoppers

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Best sellers

Frequently bought together

What our customers are saying about Specialized Carbon Steerer Tube Plug bike headset expander