FSA Orbit-C 1-1/8"
FSA

FSA Orbit-C 1-1/8"

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Integrated FSA Orbit‑C upper (IS42/28.6) with ACB sealed bearings for smooth, low‑profile steering. Fits 1-1/8" or tapered steerers when paired with the correct lower parts.

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Product Details

Overview & Technology

FSA's Orbit‑C 1-1/8" upper is a precision integrated headset component engineered for low friction and long life. It uses FSA's ACB sealed bearing system with classic 45°/45° contact angles to deliver predictable steering stiffness and smooth rotation under load. The upper cup is machined to a 42mm outer diameter (IS42) and accepts a 28.6mm (1-1/8") steerer. With a compact 15.5mm stack height and a lightweight sealed assembly, the Orbit‑C upper is designed to minimize stack while maximizing durability and weather resistance for road builds and high-performance replacements.

Key Features & Benefits

ACB sealed bearings: High‑quality sealed bearings reduce maintenance and repel moisture, grit and road salt for consistent performance season after season. The 45°/45° geometry balances axial and radial loads for crisp steering feedback. • IS42 outer diameter: Standard integrated fit for many modern frames. • 28.6mm steerer ID: For 1-1/8" straight steerers and compatibility adaptions for tapered forks. • Low stack (15.5mm): Keeps your headset profile slim under accessories and spacers.

Fit, Installation & Compatibility

The Orbit‑C upper is SHIS IS42/28.6 — that means it fits frames with an integrated 42mm upper cup bore and 28.6mm steerer ID. For tapered steerers this upper works when combined with a compatible lower cup and crown race designed for tapered forks. Always verify your frame's SHIS spec before ordering. Installation requires a headset press or compatible drift to seat the upper cup squarely into the headtube. Use light grease on the bearing contact surfaces, press to the correct depth, and torque the top cap/cone as specified by your headset/fork manufacturer. If you're replacing only the upper, confirm the lower bearing type and angle (45°/45°) match for proper preload and wear characteristics.

Who This Is For

The Orbit‑C upper is ideal for road cyclists, mechanics and home builders who need a reliable, low‑profile integrated headset component. It's a great replacement part for service intervals or when upgrading to higher‑quality sealed bearings without changing your frame's integrated cups. Choose this part if you ride in mixed conditions, want low maintenance bearings, or are building a lightweight, responsive road or gravel bike that uses IS42 headtube specifications.

Key Features

  • ✓ IS42/28.6 integrated upper cup fits many modern road frames
  • ✓ 45°/45° ACB sealed bearings for balanced load handling
  • ✓ Low 15.5mm stack height preserves headset clearance
  • ✓ Black anodized finish resists corrosion and looks OEM
  • ✓ Ideal replacement upper for 1-1/8" and tapered fork setups
  • ✓ Compact, lightweight design — 0.08 lb shipping weight

Specifications

Bearing Grade ACB Sealed
Headset Type Integrated
Upper Cup 42mm
Misc 45°/45° ACB
Primary Color Black
S.H.I.S. IS42/28.6
Steerer Tube 1-1/8''
Stack Height 15.5
Headset Position Upper
SHIS Upper IS42/28.6

Product Identifiers

Vendor Item # 121-0518
UPC 400310024220

Frequently Asked Questions

Will this Orbit‑C upper work with a tapered fork?

Yes — the Orbit‑C upper fits tapered steerers when used with the correct lower cup and crown race designed for your fork's larger lower steerer. Verify your frame's lower cup standard and match bearing angles (45°/45°) for correct assembly.

Do I need any special tools to install this upper cup?

A headset press or equivalent drift tool is recommended to press the upper cup squarely into the headtube. You may also need a crown race setter for the fork and a torque wrench for final top cap/load cap torque.

How often should I service these sealed bearings?

ACB sealed bearings are low maintenance; most riders will only need to inspect or replace them every 12–24 months depending on conditions. If you notice play or roughness, replace the bearings to avoid premature wear.

Can I mix this upper with a different lower bearing angle?

No — mixing bearing angles (for example 45°/37°) can cause improper preload and uneven wear. Use a lower bearing with the same 45° contact angle to maintain correct steering performance.

What frame headtube dimension do I need for this part?

Your frame needs an integrated upper cup bore of 42mm (IS42). Confirm your frame's SHIS spec (IS42/28.6) before purchasing to ensure compatibility.

Is this product sold as an upper only or as a complete headset?

This SKU (FSA Orbit‑C upper) is the integrated upper part only. If you need a complete headset for a specific fork type, pick the matching lower parts or a full headset kit that lists IS42/28.6 compatibility.

Buying Guide

When buying an integrated headset upper, confirm the SHIS standard (here: IS42/28.6) and the steering tube size (1-1/8" / 28.6mm). Match the bearing contact angles (45°/45°) and ensure the lower cup or lower bearing you pair it with is compatible for tapered or straight steerers. Choose sealed bearings like FSA's ACB grade for riders who need low maintenance and reliable weather sealing. Check stack height if you run top caps, spacers or integrated cable routing to ensure clearance with your stem and accessories.

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