Marzocchi

Bomber 58 27.5 Air Grip Fork

What Our Gearhead® Experts Are Saying:

"The GRIP X2 on this 40 is the most adjustable descent damper FOX has ever produced — the separation between low-speed and high-speed compression circuits gives you the ability to tune specifically for the kind of terrain you're riding without compromising one end of the speed range to fix the other. The Glidecore air spring is doing something meaningfully different from a standard EVOL spring: by reducing the friction and bind that builds under dynamic load, it keeps the wheel in contact with the ground through the kind of high-speed compressions where a conventional spring would deflect. For a dedicated DH or bike park build, the 40 Factory Grip X2 is the only fork worth speccing."

The FOX 40 has defined the downhill fork category for over two decades. Built exclusively for the highest-consequence riding — World Cup DH, technical bike park lines, and any terrain where a suspension failure has real cost — this generation updates the platform with two internal technologies that close the gap between what the 40 has always done well and what was previously left on the table in terms of compliance and tunability.

The FLOAT EVOL GlideCore air spring addresses the fundamental tension in high-travel suspension design: the trade-off between support under hard loads and sensitivity through small, high-frequency inputs. The GlideCore system reduces friction and binding by allowing the spring internals to move with the fork under dynamic lateral and compressive load rather than generating resistance against it. The practical result is a spring that maintains consistent stroke feel across the full range of terrain inputs — from square-edge braking bumps to large, high-speed compressions — without the stiction spikes that can interrupt wheel contact at critical moments. This is particularly relevant in the mid-stroke, where the 40 operates most frequently on steep, feature-heavy terrain.

The revised GRIP X2 damper represents the most sophisticated compression and rebound control system FOX has built for a downhill application. Separate low-speed and high-speed compression circuits allow independent adjustment of chassis support under pedaling and body movement loads versus response to sharp, high-speed trail impacts — a distinction that matters significantly across the range of conditions a DH rider encounters across a full season of varied courses. Rebound tuning closes the circuit, allowing precise control of how quickly the wheel returns to contact after compression. A generatively designed fork arch maintains the 40's renowned steering precision and torsional rigidity, while relocated bypass channels improve small-bump sensitivity without sacrificing support under the sustained high loads the 40 is built to absorb.

The 40 Float Factory Grip X2 is the specification for riders building dedicated downhill and bike park platforms where no performance compromise is acceptable. Kashima stanchion coating, a floating 20mm thru-axle, and full Factory-series build quality ensure that every ride performs identically to the last.