Zipp Carbon

Zipp Carbon Headset Spacers (Manufacturer Part #: 00.1915.124.010, Product #: 150235) are a precision set of UD carbon spacers engineered for 1-1/8" steerer tubes. The kit includes two 4mm spacers, one 8mm, one 12mm and one 30mm spacer to give you fine-grain control over handlebar height and stack height adjustments.

Construction and finish: made from unidirectional (UD) carbon fiber with a high-quality resin matrix and a smooth, low-gloss finish for a subtle, factory look. Each spacer is molded and heat-cured to maintain concentricity and then finished to a tight inner bore tolerance so they slip on cleanly and sit flush against integrated and semi-integrated headsets.

Lightweight and stiff: UD carbon saves grams over aluminum spacer stacks while maintaining excellent compressive stiffness so your headset preload stays consistent under load. That translates to a crisp front-end feel and a tidy cockpit without extra bulk.

Precision fit and clean aesthetics: the inner bore is sized for 1-1/8" steerers and the outside profile is optimized to stack neatly under top caps and stem faces. The set provides versatile stacking options — from micro adjustments with the 4mm pieces to larger changes with the 30mm spacer — letting you tune fit without changing stem angle.

Designed specifically for 1-1/8" steerer tubes and compatible with most integrated and semi-integrated road headsets. These spacers are not tapered — they require a straight 1-1/8" steerer or appropriate reducer sleeve if used on non-standard systems. SRAM Model ID: AC-ZHSC-A1 for reference when matching to headset families.

Installation is straightforward: slide spacers onto the steerer, stack to desired height, ensure the top cap and star nut/compression plug preload the headset correctly, then torque your stem bolts to the manufacturer's spec. Avoid over-torquing the spacer stack itself; spacers are designed to transfer preload through the compression plug and stem clamp, not to be clamped tight directly.

This spacer set is aimed at road and performance cyclists who want a lightweight, factory-finish cockpit. Ideal for racers, fit-focused riders, and anyone building a clean, minimal-looking bike where every gram and millimeter matters.

If you swap stems frequently, experiment with handlebar height, or want carbon-matched hardware to your stem and fork, these spacers offer an elegant, durable solution that elevates both performance and style.

When choosing headset spacers, prioritize steerer compatibility, material, and stack versatility. Carbon spacers like these Zipp UD pieces save weight and look cleaner than aluminum, but confirm the steerer diameter is a straight 1-1/8" and that your headset accepts standard spacer profiles.

Decide how much adjustability you want: a kit with multiple small spacers (4mm) plus larger pieces (30mm) offers the most flexibility for fitting without trial-and-error stem swaps. Finally, match finish and brand where possible for a cohesive cockpit aesthetic and consistent tolerances.