FSA Microspacer 1-1/8"
FSA

FSA Microspacer 1-1/8"

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Ultra-thin 0.25mm aluminum microspacers for 1-1/8" integrated headsets. Pack of 10 precision shims to protect the head tube and dial in preload.

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Product Details

Overview & Technology

FSA Microspacer 0.25mm is a precision aluminum shim designed for 1-1/8" integrated headsets. Each pack contains ten ultra-thin 0.25mm spacers that sit between the top cover and the compression ring to prevent direct contact between the top cover and the head tube. The Microspacer is made from corrosion-resistant aluminum and is precision-machined to a consistent 0.25mm thickness, giving you repeatable stack height adjustment without adding noticeable weight. In practice these micro-shims eliminate binding, stop cover rub, and let you fine-tune headset preload in small, reliable increments.

Key Features

Small changes, big results: 0.25mm increments let you correct tiny misalignments and avoid top cover contact with the head tube. Durable, lightweight construction—the aluminum construction balances longevity with minimal added mass. Typical benefits include preserved head tube finish, smoother steering, and repeatable headset setup. • Thickness: 0.25mm per spacer — accurate micro-adjustment • Material: precision-machined aluminum for strength and light weight • Finish: silver color to match most headset hardware • Pack of 10 — stock enough for multiple bikes or repeated adjustments

Fit & Compatibility

Specifically sized for 1-1/8" (28.6mm) steerer tubes and integrated headset systems. These microspacers sit between the top cover and the compression ring — they are not meant as crown race shims or replacement bearings. They are compatible with most integrated cups and compression ring designs but will not fit tapered (1.5" lower) interfaces by themselves. Always check your headset geometry: if your bike uses a tapered steerer or an unusual top cover diameter, verify clearance before installing multiple spacers.

Who It's For

These microspacers are ideal for keen home mechanics, wheelbuilders, and bike shops who need precise headset stack adjustments. If you ride road, gravel, or commuter bikes with integrated 1-1/8" headsets, these let you stop cover rub and fine-tune the bearing preload. Also useful for builders working with new frames where millimetre-level headset gaps cause contact or for riders who frequently refit stems and need repeatable stack height control. Lightweight, simple, and effective for everyday and performance road bikes.

Key Features

  • ✓ Precision 0.25mm thickness for fine headset preload adjustment
  • ✓ Pack of 10 spacers—enough for multiple setups or backups
  • ✓ Lightweight aluminum construction resists corrosion and adds minimal weight
  • ✓ Prevents top cover contact with head tube and reduces rub
  • ✓ Designed for 1-1/8" integrated steerer tubes and headsets
  • ✓ Easy to stack for cumulative adjustment without special tools

Specifications

Height 0.25mm
Material Aluminum
Primary Color Silver
Steerer Tube 1-1/8''

Product Identifiers

Vendor Item # 160-3021
UPC 400310041128

Frequently Asked Questions

What does this microspacer do?

The 0.25mm microspacer sits between the top cover and compression ring to prevent the top cover from contacting the head tube. It lets you fine-tune headset preload and eliminates cover rub or binding caused by tiny height mismatches.

Will it fit my headset?

These spacers are made for 1-1/8" (28.6mm) steerer tubes and most integrated headset designs. They are not intended for tapered steerers or non-integrated headsets—check top cover diameter and compression ring compatibility before installation.

Can I stack multiple microspacers?

Yes. Microspacers are designed to be stacked for cumulative adjustment (e.g., two give 0.5mm). Keep stacks reasonable—excessive stacking can affect bearing contact and aesthetics—usually a few shims are sufficient.

Are these safe on carbon head tubes?

Yes—aluminum microspacers are safe to use with carbon head tubes. Use a thin film of carbon assembly paste or light grease on contact faces to prevent micro-movement and protect the finish, and follow torque recommendations when tightening.

How many spacers come in a pack and what's the weight?

This product is sold as a bag of 10 microspacers. Total pack weight is negligible (shipping weight ~0.02 lb), making them a lightweight solution for precise headset adjustment.

Do I need special tools to install these?

No special tools are required—basic headset tools and a torque wrench for the top cap/stem are sufficient. Install the spacer(s), seat the top cover, preload the bearings, and torque to manufacturer specs.

Buying Guide

When choosing microspacers, match the spacer thickness and inner diameter to your steerer size—this FSA Microspacer is specifically for 1-1/8" integrated headsets and comes in 0.25mm increments for ultra-fine adjustment. Buy a pack if you anticipate multiple adjustments or if you work on several bikes. For installation, clean contact surfaces, apply a light film of grease or carbon paste if appropriate, place the spacer(s) between the top cover and compression ring, preload bearings, and torque to spec. Start small: a single 0.25mm spacer often fixes cover rub without changing headset geometry.

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