FSA ACB SL Hybrid 36X45
FSA

FSA ACB SL Hybrid 36X45

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Super-light FSA ACB SL Hybrid sealed cartridge headset bearing (36x45, 1.5") with hybrid-ceramic balls for smoother, longer-lasting steering. Sold individually — fits Orbit ZS.

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Product Details

Overview & Technology

FSA ACB SL Hybrid 36x45 is a super-light sealed cartridge headset bearing engineered to reduce friction and shave grams from your cockpit. The ACB SL Hybrid combines precision-machined stainless-steel races with hybrid ceramic balls and effective polymer seals to deliver a high-performance, low-drag bearing for 1.5" steerers. Why it matters: the hybrid-ceramic construction lowers rolling resistance and improves durability versus all-steel bearings, while the sealed cartridge design keeps dirt and moisture out for consistent steering feel ride after ride. The 36°x45° geometry provides optimal load distribution for modern mountain frames using the FSA Orbit ZS standard.

Key Features & Construction

Precision materials: stainless-steel races for toughness and corrosion resistance, paired with silicon nitride (Si3N4) ceramic balls for reduced mass and friction. The hybrid arrangement delivers the long life of steel races with the low friction of ceramic rolling elements. • Sealed cartridge unit — pre-lubricated and ready to install. • Dual-lip polymer seals to keep contaminants out while retaining grease. • 36°x45° contact geometry tuned for axial and radial loads on tapered 1.5" steerers. • Sold individually so you can replace just the worn side or match exact stack needs.

Fit, Compatibility & Specs

This bearing is sized for 36x45 dimensions and designed specifically for 1.5" lower headset cups — it fits FSA Orbit ZS headset assemblies and many compatible zero-stack headsets that use the same sealed cartridge form factor. Confirm your headset calls out a 36x45 (1-1.5) lower bearing before purchase. Part numbers & packaging: Manufacturer part # 160-1656, Vendor #: 160-1656, Forest Bikes SKU 150284, internal number 073-RS. Shipping dimensions are compact (4.5" x 3.4" x 0.3") and each unit weighs ~0.08 lb. Sold individually — check whether your build needs the top, the bottom, or both bearings.

Who It's For

Designed for mountain and trail riders upgrading or maintaining a modern tapered headset, the ACB SL Hybrid is for cyclists who want a lighter, smoother steering feel with increased longevity. It's an ideal choice for riders who value low bearing drag for efficiency on climbs or who demand precise steering for technical singletrack. Mechanics, bike shops, and DIY tuners will appreciate the cartridge format for quick swapouts, while racers and weight-conscious riders will like the SL (super-light) blend of materials without sacrificing durability for trail use.

Key Features

  • ✓ Super-light hybrid-ceramic cartridge bearing for reduced rolling resistance
  • ✓ 36°x45° contact geometry optimized for 1.5" tapered steerers
  • ✓ Stainless-steel races with silicon nitride ceramic balls for longevity
  • ✓ Dual-lip polymer seals keep water and grit out under real-world conditions
  • ✓ Pre-lubricated sealed unit — ready to install, sold individually
  • ✓ Direct fit for FSA Orbit ZS and compatible zero-stack headsets

Specifications

Number 073-RS
Bearing Dimensions 36°x45°, 1-1.5

Product Identifiers

Vendor Item # 160-1656
UPC 400310067012

Frequently Asked Questions

Will this bearing fit my headset?

This bearing is sized 36x45 and made for 1.5" tapered steerers and Orbit ZS headset cups. Check your headset spec or measure the inner cup diameter to confirm compatibility before ordering.

Is the ACB SL Hybrid actually ceramic?

It's a hybrid ceramic bearing: stainless-steel races combined with silicon nitride (Si3N4) ceramic balls. This gives lower friction and reduced weight compared to all-steel bearings while retaining steel race durability.

Do I need to replace both bearings at once?

Not necessarily — this product is sold individually so you can replace only the worn side. However, for best long-term performance and matched feel, many mechanics recommend replacing both cups at the same time if one side shows significant wear.

Can I service the bearing or re-grease it?

As a sealed cartridge the bearing is pre-lubricated and not intended for routine disassembly. Keeping the seals intact is key; if the seal is damaged or the bearing shows play, replace the cartridge rather than attempting to open it.

How much weight will I save over standard bearings?

Weight savings vary with specific stock bearings, but hybrid-ceramic SL units typically shave several grams per bearing versus conventional steel cartridges. The main benefits are reduced rotational mass and lower friction rather than dramatic gram savings alone.

Are these suitable for wet or muddy conditions?

Yes — the sealed cartridge and dual-lip seals offer good protection against water and grit. Still, in extremely muddy or salty environments regular inspection and timely replacement when contamination occurs will maximize lifespan.

Buying Guide

When choosing headset bearings, confirm the bearing dimensions, contact angle, and whether your headset uses cartridge bearings or loose bearings. Cartridge units like the ACB SL Hybrid are easy to install and replace — pick the exact 36x45, 1.5" spec to ensure a correct fit. Consider materials and environment: hybrid-ceramic bearings reduce friction and weight, while sealed cartridges with robust seals are best for wet and dirty trail conditions. If you ride aggressively or in harsh conditions, plan routine inspections and replace cartridges at the first sign of play or grinding.

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