Installation requires the removal of the factory BMW dust cap before installing the VAC Wheel Hub Extender.
Once the factory dust cap is removed, the hub extender is designed to install as an interference fit onto the factory hub. Please clean with a wire brush if needed and the ID should be 66mm.
There are two common installation methods:
OPTION 1 -- Rubber Mallet Installation
Using a hard rubber mallet, start the hub extender evenly onto the hub and gradually tap it into place.
Work evenly around the extender at:
- 12 o'clock
- 3 o'clock
- 6 o'clock
- 9 o'clock
Continue working around the hub extender until fully seated.
OPTION 2 -- 2x4 & Small Sledge Method
For easier installation, position a short 2x4 section against the face of the hub extender.
Using a small, low-poundage sledgehammer, lightly tap the wood block to evenly seat the extender onto the hub.
This method helps distribute force evenly and is often easier than using a rubber mallet alone.
IMPORTANT INSTALLATION NOTES
- Ensure the hub surface is clean before installation
- Install hub extenders evenly to avoid binding
- Do not strike the hub extender directly with a metal hammer
- Verify full seating before wheel installation
- Professional installation recommended for motorsport applications