Steerer Tube Extender

$125.00

Ever had trouble fitting a new stem to a fork only to find that the steerer tube is now too short? The Velobike Steerer Tube Extender raises the height of your steerer by up to 18mm. Precision machined from aluminium, 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 around 30mm long.

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” / 28.6mm) external diameter steerer tubes
Tighten up to 6N/m<
Weight:10mm: 62g15mm: 67g18mm: 71g

We strongly recommend to epoxy bond the steerer tube extender into your steerer tube for best security.

Frequently Asked Questions

The extender can be fitted to bikes with a 1 ⅛" external diameter steerer tube. This includes many modern track, road and mountain bikes.

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.

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.

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.

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.

In theory, yes. 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.