FSA Orbit C-33
Orbit C-33
FSA

FSA Orbit C-33

In Stock

The FSA Orbit C-33 is an ultra-light integrated headset (69 g) with carbon top cover and ACB sealed bearings, built for tapered 1-1/8"–1-1/4" forks and IS42/IS47 frames. Precision 45°/45° bearing angles deliver smooth, durable steering for performance road bikes.

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Product Details

Overview & Technology

FSA Orbit C-33 is a performance-focused integrated headset engineered for modern road frames that use IS42/28.6 upper and IS47/33 lower cups. At just 69 g for the complete headset, the C-33 pairs a carbon-fiber top cover with high-grade ACB sealed angular-contact bearings to shave grams without sacrificing stiffness or durability. The 45°/45° bearing contact geometry and dual-seal design (yellow upper, black lower) reduce friction and keep contaminants out during long rides. The result is crisp, consistent steering feel and low maintenance—ideal for riders who want race-ready responsiveness and lightweight finishing kit for carbon or alloy head tubes.

Key Features & Build Details

The Orbit C-33 uses ACB sealed angular-contact bearings—an upper 1-1/8" (yellow seal) and a lower 1-1/4" (black seal)—to accept tapered forks while maintaining alignment under load. The crown race diameter is 33 mm and the headset stack height is a minimal 16.6 mm (15.6 + 1 mm spacer), keeping your cockpit low and tidy. • Carbon-fiber top cover for weight savings and premium finish • Integrated design for IS42/28.6 upper and IS47/33 lower head tubes • 45°/45° bearing angles for even load distribution and smooth steering • Compatible with both carbon and alloy head tubes

Fit, Compatibility & Installation Notes

The C-33 is an integrated headset sized for frames with IS42/28.6 upper and IS47/33 lower interfaces and is built to accept tapered 1-1/8" to 1-1/4" steerer forks. Confirm your frame’s internal diameters (42 mm upper / 47 mm lower) and that your fork steerer transitions from 1-1/8" to 1-1/4" before ordering. Installation requires a headset press and the correct 33 mm crown race; use a light smear of grease on alloy interfaces or a carbon assembly paste where components contact carbon. Torquing the top cap and stem should follow your stem manufacturer’s specs—avoid over-torquing which can damage shims or carbon covers.

Who It's For

The Orbit C-33 is aimed at road cyclists who prioritize low weight and precise steering—from racer and crit riders to fast weekend roadies upgrading cockpit components. It’s an excellent choice for lightweight builds and frames with integrated headsets where every gram and aero-appearance counts. If you ride mixed-surface gravel or heavier-duty touring, consider more robust headset options with higher stack heights and larger bearings; the C-33 is optimized for stiffness-to-weight and clean aesthetics on performance road bikes.

Key Features

  • ✓ Ultra-light 69 g complete integrated headset with carbon-fiber top cover
  • ✓ Precision 45°/45° ACB sealed bearings for smooth, durable steering
  • ✓ Compatible with IS42/28.6 upper and IS47/33 lower integrated head tubes
  • ✓ Designed for tapered 1-1/8 to 1-1/4 steerer forks fits 47/52 mm
  • ✓ 33 mm crown race diameter and low 16.6 mm stack height
  • ✓ Upper yellow-seal and lower black-seal bearings for dust resistance

Specifications

Bearing Grade ACB Sealed
Crown Race Diameter 33mm
Lower Cup 47mm
Headset Type Integrated
Upper Cup 42mm
Headset Weight 69g
Misc 45°/45° ACB (black seal)
Primary Color Carbon
S.H.I.S. IS42/28.6 | IS47/33
Steerer Tube 1-1/8''-1-1/4''
Stack Height 16.6
Headset Position Complete
SHIS Upper IS42/28.6
SHIS Lower IS47/33

Product Identifiers

Vendor Item # 121-0474
UPC 400310023001

Frequently Asked Questions

What frame and fork standards does the Orbit C-33 fit?

The Orbit C-33 fits integrated head tubes with IS42/28.6 upper and IS47/33 lower interfaces and is designed for tapered forks with a 1-1/8" to 1-1/4" steerer. Confirm your frame’s internal cup diameters and that your fork steerer tapers to 1-1/4" at the crown.

Do I need a special crown race or adapter?

Yes — the C-33 uses a 33 mm crown race diameter. Make sure your fork has a compatible crown race or purchase the correct 33 mm crown race for the fork. Using the wrong crown race will prevent proper seating and can affect bearing preload.

How durable are the bearings and seals for wet conditions?

FSA uses ACB sealed angular-contact bearings with distinct seals (yellow upper, black lower) for enhanced dust and moisture protection. They’re well suited to normal riding and occasional wet conditions, but routine inspection and regreasing when necessary will extend service life—especially after heavy exposure to mud or rain.

Can I use the C-33 on carbon head tubes?

Yes. The Orbit C-33 is compatible with both carbon and alloy head tubes. For carbon interfaces, use a carbon assembly paste at clamping surfaces and follow torque specs to avoid crushing or over-compression of the carbon structure.

Is the headset suitable for gravel or heavier-duty use?

The C-33 is optimized for lightweight road performance and low stack height, so while it will work on light gravel bikes with matching standards, riders planning aggressive off-road, bikepacking loads, or very rough conditions may prefer a headset with larger bearings and higher stack for improved durability.

What tools are required for installation?

You’ll need a headset press (or appropriate press tool), crown race driver for 33 mm, torque wrench for the top cap and stem bolts, and appropriate grease or carbon paste. If you’re unsure, have a qualified mechanic install it to ensure correct seating and preload.

Buying Guide

When selecting an integrated headset, match the S.H.I.S. interface (IS42/28.6 upper, IS47/33 lower) and confirm your fork steerer standard (tapered 1-1/8" to 1-1/4"). Prioritize stack height if you run a low-profile cockpit—C-33’s 16.6 mm stack keeps bars low and aerodynamic. Consider materials and sealing: carbon top covers save weight and look premium, while high-quality sealed bearings (like ACB) balance low friction with protection against contaminants. If your riding includes heavy off-road use, look at larger-bearing, higher-stack alternatives for added longevity.

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