The Fox 32 Step-Cast (SC) 100mm Boost is the absolute lightest, race-focused cross-country (XC) and marathon mountain bike suspension fork offered by FOX Factory. Weighing in under 1,300 grams, this dedicated 29er fork is stripped of all excess material to deliver maximum speed, acceleration, and compliance on the racecourse.
Essential Key Specifications
- Travel: 100mm fixed (optimized strictly for XC, marathon, and ultra-distance racing).
- Wheel Size: 29 inches only on the latest generation.
- Axle Spacing: 15x110mm Boost, utilizing the ultra-lightweight Kabolt SL bolt-on thru-axle.
- Chassis Design: Distinctive “Step-Cast” stepped lower legs that narrow at the bottom to reduce weight and create disc brake/spoke clearance. The latest generation features a stark reverse arch design that increases torsional stiffness by 40% over its predecessor.
- Air Spring: FLOAT EVOL system that automatically equalizes positive and negative air chambers for optimal small-bump compliance.
- Fox 32 Step-Cast Factory Series:
- The premier racing flagship tier featuring premium Kashima Coat gold-anodized stanchions for ultra-low friction and high durability.
- Equipped with the flagship GRIP SL damper, a short-travel specific cartridge that saves critical weight and provides an incredibly firm, smooth blowoff when locked out.
- Fox 32 Step-Cast Performance Series:
- The budget-conscious version utilizing black-anodized 7000-series aluminum stanchions instead of Kashima coating.
- Uses the highly reliable and durable base GRIP damper, which implements an independent floating piston to purge excess oil and keep damping consistent.
- Damping Controls: Available either with a crown-mounted manual 3-position adjustment lever (Open, Medium, Firm) or as a Push-Lock remote setup for instantaneous handlebar lockouts.
- Offset (Rake): Typically spec’d with a 44mm offset to yield snappy, fast-turning geometry on modern steep head-angle cross-country frames.
- Volume Tunable: Fork progressiveness can be fine-tuned by adding or removing plastic air volume spacers (tokens) beneath the air top cap to customize bottom-out resistance.
https://ridefox.com/pages/fox-32-step-cast


