Pro Headset Spacer Set 1/18

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:

$\Delta h = \sum \text{Spacer Heights}$

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.