The Fox Float 36 Rhythm eMTB suspension fork is a staple among electric mountain bikers seeking a balance of durability, stiffness, and tunability. Designed specifically for the added forces of eMTBs, it delivers consistent control and plush performance across aggressive terrain. This guide dives deep into the Float 36 Rhythm’s installation, adjustment, maintenance, and optimization, offering a detailed look at why this fork remains a favorite for riders.

Tools Required

• 5mm and 6mm hex wrenches
• Torque wrench [paid link]
• Shock pump (up to 300 psi)
• Suspension grease
• Isopropyl alcohol
• Clean shop rags
• Crown race setter (if installing a new headset)
• Star nut setter (if using a traditional steerer)
• Suspension oil (Fox 20wt Gold)
• Oil measuring cup

Installation Overview

Proper installation is essential to ensure safe operation and optimal performance. The Float 36 Rhythm comes with a tapered steerer tube and is compatible with 15x110mm Boost axle standards.

Steerer Tube Preparation

The steerer must be cut to the correct length for the bike’s headtube and stem stack. Always use a cutting guide to ensure a square cut. Install the star nut or fit a compatible compression plug if using a carbon steerer tube.

Crown Race and Headset Fitment

Ensure the crown race is fully seated using a crown race setter. Slide the fork into the headtube, stack spacers as needed, and secure the stem, tightening bolts to manufacturer torque specifications.

Brake and Wheel Compatibility

The Float 36 Rhythm uses a post-mount brake interface compatible with 180mm rotors out of the box. Larger rotors require adaptors. Insert the front wheel with a 15x110mm Boost hub, ensuring the thru-axle is torqued correctly to avoid play.

Adjustment Settings

The Rhythm model includes several key adjustment points designed for eMTB demands, offering comfort and control through rough terrain.

Air Spring Pressure

Fox provides a pressure chart based on rider weight. Using a shock pump, adjust the pressure to achieve 15-25% sag. Sag should be measured with the rider in a typical riding posture, not static standing.

Rebound

The red rebound knob under the right fork leg adjusts how quickly the fork returns after compression. Slower rebound improves stability on rough trails; faster rebound increases responsiveness.

Compression

The black compression dial atop the right leg tunes low-speed compression. For eMTB use, a firmer setting is often preferred for climbing efficiency and resisting dive under braking.

Volume Spacers

The Float 36 Rhythm is compatible with volume spacers that alter the fork’s progression. Adding spacers makes the fork ramp up more aggressively, ideal for aggressive downhill riding.

Routine Maintenance

To extend the lifespan of the Float 36 Rhythm, regular maintenance is non-negotiable.

30-Hour Service

Every 30 riding hours, clean the fork exterior and inspect the dust wipers. Apply a light suspension-specific lubricant around the seals and compress the fork to work it in.

100-Hour Service

At this interval, lower leg service is due. Remove the lower legs, drain and replace the bath oil, clean the foam rings, and inspect internal components for wear. Always reassemble with fresh grease and torque to specification.

Annual Overhaul

For riders logging significant miles or racing, an annual damper service is advised. This involves a full teardown of the FIT GRIP damper, replacing O-rings, seals, and oil.

Troubleshooting Common Set-Up Issues

Fork Feels Harsh Over Small Bumps

Often caused by excessive air pressure or too much compression damping. Reduce pressure slightly and back off the compression clicker for improved sensitivity.

Excessive Dive When Braking

Reduce sag or add volume spacers. Increasing low-speed compression can also improve support without compromising small bump compliance.

Fork Topping Out

If the fork returns too fast or makes a knocking sound at top-out, increase rebound damping incrementally until the issue resolves.

Leaking Oil

Oil seepage around the seals indicates a need for a lower leg service. Persistent leaking after service may require replacement of wiper seals.

Customization and Performance Optimization

Riders often modify the Float 36 Rhythm for personalized performance and terrain matching.

Upgrading to GRIP2 Damper

While the Rhythm uses a simplified GRIP damper, riders wanting more tunability can swap to the GRIP2 unit, which offers high- and low-speed rebound and compression adjustments.

Volume Spacer Tuning

Aggressive riders on technical trails benefit from additional spacers, which increase bottom-out resistance. Lighter riders or those seeking plushness can remove spacers to soften mid-stroke support.

Aftermarket Axle Upgrades

Replacing the stock QR axle with a bolt-on version like the Kabolt-X increases stiffness and reduces weight slightly, beneficial for heavier eMTBs.

Compatibility with Other Drivetrain Components

The Float 36 Rhythm is agnostic to drivetrain brands but must be matched with appropriate wheel and brake systems.

Brake Caliper Fitment

Supports any post-mount disc brake system, including SRAM, Shimano, TRP, and Magura. Match rotor size and caliper adaptors carefully.

E-Bike Rated Components

As an eMTB-specific fork, it’s compatible with the additional torque and weight of electric drivetrains, making it ideal for Bosch, Shimano STEPS, and other mid-drive systems.

Frame Clearance

Ensure your eMTB frame can accommodate a 36mm stanchion fork and the travel length (typically 150-170mm for this model) without affecting geometry or handling negatively.

Comparison with Similar Models

Understanding how the Float 36 Rhythm stacks up against competitors helps riders make informed choices.

Float 36 Factory vs Rhythm

The Factory model includes Kashima coating, GRIP2 damper, and lighter materials. Rhythm is heavier and lacks the high-end features but offers unbeatable performance-to-cost ratio.

RockShox ZEB

The ZEB is stiffer and heavier, designed for enduro and e-enduro racing. It offers more travel options but at a higher cost and weight penalty.

Marzocchi Bomber Z1

Similar in internals to the Float 36 Rhythm but with a more relaxed, freeride-oriented damper feel. A good alternative for budget-conscious riders seeking simplicity.

Conclusion

The Fox Float 36 Rhythm eMTB suspension fork continues to earn rider loyalty thanks to its exceptional strength, adjustability, and trail-ready performance at an accessible price. Whether you’re climbing steep fire roads or dropping into technical descents, it provides reliable control without overwhelming complexity. With regular maintenance and careful tuning, this fork can match—and often exceed—the expectations of demanding eMTB enthusiasts.