Velobike Steerer Tube Extender
Velobike Steerer tube extender
Velobike Steerer Tube Extender
Velobike Steerer Tube Extender
Velobike Steerer Tube Extender
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Steerer Tube Extender

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Ever had trouble fitting a new stem to a fork only to find that the steerer tube is now too short? The Velobike Innovation steerer tube extender raises the height of your steerer by up to 18mm. Precision machined from aluminum, the light weight extender means you no longer have to purchase a new fork for your frameset. 

Note: When using the longer 15mm and 18mm extenders, you may require a longer top cap bolt. Standard bolts are normally 30mm long. We sell top caps with a longer 40mm titanium bolt for the steerer tube extenders.  



  • 10mm, 15mm and 18mm extension heights available

  • 50mm deep expansion plug

  • Standard M6 insert thread for stem top caps

  • Suitable for aluminium and carbon steerer tubes

  • Hard anodised black
  • 6061-T6 aluminium

  • Fits 1 ⅛ (1.125” / 28.5mm) steerer tubes

  • Tighten up to 6N/m

  • We recommend to epoxy bond them into your steerer tube for best security

  • Weight: 10mm62g, 15mm67g, 18mm71g


  • Will this fit any bike? The extender can be fitted to any bike with a standard 1 ⅛ steerer tube. This includes many modern road or mountain bikes.

  • Is it strong? Yes, This type of expansion plug system is common for steerer tube and headset assemblies. We have opted for a longer 50mm knurled plug for the extra security and stiffness. Most headset plugs are around 30mm. we recommend the extender to be epoxy bonded into the steerer for best security.

  • What epoxy do use for install?
    A medium/high strength two part epoxy from a hardware store is suitable. Smear a few dabs on each of the three aluminium knurled surfaces before install. This increases the surface friction between the extender and the steerer tube.

  • How do I remove it - if its glued in?
    If it's required to remove the extender in the future, use the epoxy sparingly. Disassemble the extender, then each of the three blocks can be knocked out without damaging the carbon within the steerer tube.

  • Can you make the extension longer than 18mm? In theory yes it is possible to make them longer, however, for safety reasons we have set the maximum height at 18mm. We suggest you have at least half of your stem clamping around your original steerer tube. 

  • The extender is too large in diameter to fit inside my steerer tube. Every steerer tube can be have different internal dimensions - especially carbon ones where the internal dimensions are variable. We have designed the extender to have a tighter tolerance fit into most steerer tubes than your standard headset expansion plug for safety and security. Prior to purchasing, measure the inside diameter of your steerer tube. If it measures any smaller than 22.50mm, you may need to sand some material out. This intersection zone between the steerer tube and extender is only 3mm deep, so not very much material will need to be removed from the inner edge of your steerer tube. If in doubt, ask your local bike shop for assistance.

© The intellectual property for this product is owned by Velobike Innovation Limited. All rights reserved.

Customer Reviews

Based on 36 reviews
Saved my bike fit!

I bought a retired bike from a pro team that had the stem slammed and steerer cut down. This extender allowed me to get a few spacers underneath the stem and my back and neck are much happier. The extender is well made and had a nice snug fit into the carbon steerer. The shipping was also way faster than expected to the US.

Missy S.
A necessity for clients

This has become a staple in my studio when mentioning to clients the constant shifts we are seeing in track positions. Older frames, and newer, often need modification. The steer tube extender gives us just that. Great product.


Brilliant, innovative design. Works perfectly.

Aldrich G.
Perfect Solution

The steerer tube extender worked perfectly and feels solid. Saved be from buying a new mismatched colored fork. A perfect solution when buying a preowned bike.