Fox Shock MAC Piston & Wear Band Kit

Inspired by the GOAT, Maximally Attenuated Compression (MAC) pistons are taking position sensitive damping performance to all new heights. The increased piston and wear band height is designed to fully overlap external bypass ports, delivering more seamless and consistent damping performance. The greater wear band contact area provides an improved seal, making valving more effective while also increasing strength and rigidity. Enhanced compliancy allows for a smoother transition between bypass zones, plus increased bottom-out performance.

 

Sold as a Kit & Includes:

• (1) Piston w/ O-Ring
• (1) Wear Band

 

EXCEEDING 110%

The increase in wear band height

provides full coverage of the bypass

ports, eliminating a brief drop in force

previously experienced with standard

pistons as they travel across each

port. While standard piston port

coverage ranges from 46-71%, MAC

pistons deliver 112-173% coverage.

 

STOPPING THE BLEED

The larger wear band increases the

contact area with the body, creating

an improved seal and reducing

uncontrolled fluid bleed around the

piston.

 

SOFTER BUT FIRMER

By eliminating the drop in force when

crossing bypass ports and reducing

uncontrolled bleed around the piston,

the valving becomes more effective

and the damping more consistent.

This provides the opportunity to open

the bypass tubes for enhanced

comfort and traction in the ride zone,

complimented by more seamless

transitions between each bypass zone

while simultaneously delivering

increased bottom-out performance.

That translates to a smoother, more

bottomless feel – or “softer, but

firmer” as Rob Mac would say.

 

STRENGTH & DURABILITY

The taller height also increases the

rigidity and strength of the piston and

shaft assembly, minimizing the effects

of dynamic side-loading and the

resulting wear on parts.

 

BILLET ALUMINUM

New 9-hole high flow design is

machined from 2024-T6 billet

aluminum and is hard anodized for a

long-lasting finish.

 

LIGHTER

By switching to billet aluminum

pistons on 4.0 and 4.4 external

bypass shocks, we achieved a 52%

reduction in piston weight compared

to standard height steel pistons. This

decrease in mass equates less

dramatic shifts in inertial forces when

transitioning between compression

and rebound, resulting in more

responsive suspension.

 

UPGRADE/RETROFIT

The new MAC piston is now available

as an upgrade and is backwards

compatible on all existing 2.5 and

larger external bypass shocks.

 

Need additional Fox shock replacement parts? 

Give us a call at 619-988-1734 we off the full line of Fox replacement parts for Motorsports, Powersports (UTV) and Truck shocks.

Why this setup works

We build it. We ride it. This package is tuned for grip, control, and comfort—validated by race data and real-world miles.

Vehicle compatibility

See fitment tab or ask our team for exact fit.

What’s in the box

Dual-rate coils, hardware, and setup guidance. Shock services include fresh oil, seals, and damping calibrated for your terrain.

FAQ

What this product helps you do

utv suspension, sxs suspension, race-proven suspension, sdg shocks, dual-rate spring kit, shock rebuild, shock revalve, utv shock tuning