Pro Headset Spacer Set 1/18
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PRO Headset Spacer Set 1⅛″
PRO 1⅛ Inch Headset Spacer Set
The PRO Headset Spacer Set 1⅛″ is a set of spacers used on a bicycle’s fork steerer tube to adjust:
- handlebar height
- cockpit position
- stem stack height
It is compatible with the standard 1⅛ inch threadless headset system, which is the most common modern bicycle steerer size.
What it does
Headset spacers sit between:
- the headset top cap
- and the stem
They allow you to raise or lower your handlebar position by changing stack height.
Typical uses:
- improve riding comfort
- fine-tune fit
- increase control on MTB/gravel bikes
- lower position for aggressive road riding
Common spacer sizes
Most spacer kits include combinations like:
- 2.5mm
- 5mm
- 10mm
- 20mm
allowing multiple fit configurations.
Compatibility
Fits:
- 1⅛″ threadless steerers
- most:
- road bikes
- gravel bikes
- MTB bikes
- hybrid bikes
❌ Not for:
- threaded headsets
- tapered lower headset sections directly
- oversized 1.5″ steerers at lower crown
Why spacers affect fit
Handlebar height changes rider posture:
More spacer height:
- more upright position
- improved comfort
- reduced pressure on hands/back
Less spacer height:
- lower aerodynamic position
- increased front-end weighting
- sharper handling feel
Material & construction
PRO spacer sets are typically:
- lightweight aluminium alloy
- anodized black finish
- precision-machined for proper headset preload alignment
Best suited for
- bike fitting adjustments
- MTB cockpit setup
- gravel bike comfort tuning
- road bike stem height adjustment
- replacing mismatched spacers
Pros
- simple cockpit adjustment solution
- lightweight and durable
- universal 1⅛″ compatibility
- clean integrated appearance
- inexpensive but important fit component
Trade-offs
- only works with threadless systems
- too many spacers can reduce front-end stiffness
- aesthetic preferences vary with tall spacer stacks
Bottom line
The PRO 1⅛″ Headset Spacer Set is a simple but essential cockpit fitting component, allowing riders to fine-tune handlebar height and riding position on modern threadless road, gravel, and mountain bikes.
