Get the head tube bore right before pressing headset cups. The Unior 1 1/8" head tube reamer brings the bore to the correct diameter, ensuring bearing cups have a consistent, interference-fit surface to seat against — preventing creaking and premature bearing wear.

• Reams the head tube bore to the correct diameter for 1 1/8" headset cup installation
• Precision-ground cutters for a smooth, accurate bore surface
• Removes manufacturing inconsistencies and damage from the head tube bore
• Suitable for aluminium and steel frames
• Professional Unior workshop build quality for repeatable results

A properly reamed head tube ensures headset cups press in with correct interference fit — not too loose (which causes movement and wear) and not requiring excessive force (which can crack carbon or aluminium). This reamer handles the bore preparation step; pair with a facing tool for complete head tube prep.

Designed for 1 1/8" head tube standard. For combined reaming and facing, see the Unior 626479 reamer and facer set (BPW-U1186).