6 Best Suspension Volume Spacers For Progressive Ride Tuning

Hitting a drop-off with your suspension bottoming out harshly against the trail is a surefire way to kill your momentum and confidence. Dialing in your mountain bike setup with volume spacers transforms a linear, wallowing ride into a supportive platform that keeps you pinned through technical sections. Understanding how to manipulate air spring volume is the single most effective way to refine your ride quality without spending thousands on new hardware.

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Fox Racing Shox Float Volume Spacer Kit: Top Pick

The Fox Float Volume Spacer kit stands as the industry gold standard for its sheer simplicity and reliability. These color-coded plastic spacers snap directly onto the underside of the air top cap, making them incredibly easy to install or remove without specialized tools. They offer the most predictable progression curve, allowing riders to sharpen their fork’s feel for high-speed chattering and big-hit absorption.

Because these spacers are designed specifically for Fox’s proprietary air spring architecture, they maintain a perfect seal and prevent common air migration issues. They are the go-to choice for riders who want an “install and forget” solution that delivers consistent performance across varying temperatures and trail conditions. If you own a Fox fork, sticking with the manufacturer-engineered kit is the smartest move for long-term reliability.

RockShox Bottomless Tokens: Best for Pike and Lyrik

RockShox Bottomless Tokens are essential for anyone pushing a Pike or Lyrik to its limits on steep, rugged terrain. These threaded tokens screw into the top cap, allowing for precise, incremental adjustments that drastically alter how the fork handles mid-stroke support. By installing these, the air spring becomes more supportive, preventing the fork from diving under heavy braking or in steep switchbacks.

These tokens are highly recommended for aggressive trail and enduro riders who find their suspension too mushy on fast, repetitive impacts. The threaded design ensures they stay securely in place, even through the most jarring rock gardens and high-speed G-outs. They offer a refined, premium feel that makes the front end of the bike feel significantly more capable than a stock, high-volume setup.

MRP Ramp Control Cartridge: Best On-the-Fly Tuning

The MRP Ramp Control Cartridge replaces traditional static spacers with an adjustable, knob-based system that changes your fork’s progression instantly. By rotating the dial at the top of the fork leg, the rider controls the speed-sensitive damping, essentially creating a “bottomless” feel on the fly. It is the ultimate tool for riders who constantly switch between flowing groomed trails and punishing, rocky descent-heavy terrain.

This upgrade is ideal for the obsessive tinkerer or the racer who needs to adjust for changing track conditions between stages. While the upfront investment is significantly higher than a simple bag of plastic tokens, the convenience and performance range are unmatched. For those who demand perfection and hate pulling their fork apart just to add one spacer, this is the definitive upgrade.

Cane Creek DBAir Volume Spacers: Best Rear Shocks

Cane Creek DBAir volume spacers are uniquely designed to tune the ride quality of rear shocks, specifically for bikes with highly linear suspension kinematics. Rear shocks require careful management of air volume to prevent harsh bottom-outs without sacrificing the small-bump sensitivity that provides traction. These spacers are thick, durable, and engineered to fit seamlessly into the complex air cans of high-end Cane Creek dampers.

They are the perfect choice for riders who feel their rear shock is “blowing through” the middle of its travel on berms or compressed rollers. By installing these, the shock gains a supportive, poppy feel that makes jumping and manualing much easier. If you are frustrated by a rear end that feels dead or sluggish, these spacers are the secret weapon to waking up your frame’s potential.

RockShox Monarch Bottomless Rings: A Great Value

RockShox Monarch Bottomless Rings represent the most economical way to transform a budget-friendly rear suspension setup. These simple, rubberized rings slide into the air can, reducing volume to create a more ramped-up, progressive feel. They are incredibly lightweight, making them an attractive option for weight-conscious XC riders who still want to hit the occasional larger feature without clanking their shock against the bumpers.

Despite their simple appearance, they are highly effective at preventing the harsh, “harsh-bottom” sensation common in smaller air-can shocks. They are perfect for riders who want to improve their bike’s composure on a shoestring budget. While they lack the sophisticated feel of a high-end air spring, they provide a tangible improvement in ride quality that is well worth the nominal cost.

Fox 36 and 38 Fork Volume Spacers: Ideal for Enduro

Fox 36 and 38 spacers are specifically tailored to the robust demands of enduro racing and high-consequence mountain riding. The large-stanchion chassis of these forks moves a lot of air, and these spacers are designed to provide the massive ramp-up needed for heavy riders or high-speed, high-impact environments. They are thick, durable, and designed to withstand the heat and pressure fluctuations of long, sustained alpine descents.

If you are a heavier rider or one who spends significant time in a bike park, these are essential components for managing bottom-out control. They ensure the fork remains composed through repeated hits, preventing the fatigue that comes from an undersprung front end. These are a non-negotiable part of the setup for any rider pushing a 160mm+ travel bike to its absolute limits.

How to Choose the Right Volume Spacers for Your MTB

Choosing the correct volume spacers requires a balanced approach between your body weight, your riding style, and your frame’s inherent suspension design. If your suspension feels too soft or dives under braking, you likely need to add a spacer to increase progression. Conversely, if you never reach the last 20% of your travel even on the biggest hits, you are likely over-spaced and should remove one.

Consider the nature of your local trails; high-speed, jump-heavy terrain benefits from more spacers to prevent harsh landings. Conversely, loose, technical XC trails often demand fewer spacers to allow the suspension to track over small roots and rocks efficiently. Always document your starting point before making changes so you can revert to a known, stable baseline if a setup feels too extreme.

Step-by-Step Guide to Safely Installing Your Spacers

Safety begins with a clean environment; ensure your fork or shock is completely free of dirt and grit before opening the air chamber. Use a high-quality shock pump to bleed every single PSI of pressure from the valve before attempting to remove the air top cap. Neglecting this step can lead to a dangerous projectile and potential injury, so take your time and follow the manufacturer’s service manual precisely.

Once the cap is removed, install or remove your spacers with clean hands to prevent debris from contaminating the air seal. Apply a light layer of manufacturer-approved suspension grease to the seals before reassembling the unit to ensure a smooth, airtight seal. After tightening the cap to the specified torque, cycle the suspension gently before adding full pressure back into the chamber.

Understanding How Spacers Change Your Suspension

Volume spacers alter the “spring curve” of your bike, transforming it from a linear progression—where the force required to compress the shock increases at a constant rate—to a progressive curve. As the air piston pushes toward the bottom of the chamber, a smaller volume of air compresses more rapidly, creating a firm “ramp-up” at the very end of the stroke. This acts as a physical barrier against bottoming out during extreme maneuvers.

It is important to remember that volume spacers do not replace the need for proper sag adjustment or rebound damping. They simply provide the necessary support to keep the bike sitting high in its travel, which in turn helps your other suspension settings work more effectively. Think of spacers as the foundation of your setup, not a magic fix for poor air pressure or outdated damping circuits.

Signs You Have Added Too Many Tokens to Your Setup

The most obvious sign of over-spacing is an inability to use your full travel, even on sections of trail that should reasonably demand it. If your suspension feels harsh or chattery on small, high-frequency impacts, you have likely made the spring rate too progressive, preventing the fork from engaging with the ground. This “stuttery” feeling creates a disconnected sensation that leads to arm pump and decreased traction.

If you find that the fork or shock feels incredibly supportive for the first two-thirds of the stroke but hits an abrupt “wall” at the end, remove a token. The goal is to reach full travel only on the hardest hits of your regular riding loop. Achieving this sweet spot requires patience, so aim for subtle adjustments rather than wholesale changes to your suspension’s personality.

Properly tuned suspension is the difference between surviving the trail and truly riding it. Take the time to experiment with these small changes, and you will find a level of control and comfort that transforms your bike into a true extension of yourself. Now, get out there, test those settings, and enjoy the ride.