The Fox Float 36 Rhythm eMTB fork is engineered for trail riders seeking responsive performance and durable control under demanding off-road conditions. Designed specifically to complement the added weight and torque of electric mountain bikes, this fork offers a refined blend of stiffness, support, and adjustability. This guide covers everything you need to install, adjust, maintain, and optimize the Float 36 Rhythm eMTB fork for maximum performance on the trail.

Tools Required

• 5 mm and 6 mm hex wrenches
• Torque wrench [paid link] with Nm scale
• Crown race setting tool
• Shock pump (accurate to 300 psi)
• Suspension grease
• Isopropyl alcohol and clean shop towels
• Bike stand [paid link]

Installation of the Float 36 Rhythm eMTB

Proper installation is crucial to achieving reliable fork function and rider safety. The Float 36 Rhythm eMTB features a tapered steerer and 15QR x 110 mm Boost axle spacing, which must be matched correctly with the frame and front wheel.

Begin by inserting the steerer tube into the head tube. Ensure the headset bearings are properly greased and seated. Secure the stem, leaving enough steerer for spacers and stem clamp height, then torque the top cap to preload the bearings. Tighten stem bolts evenly to 5-6 Nm.

Install the front wheel into the fork dropouts using the Kabolt-X or standard QR axle, depending on your model. Tighten the axle to the recommended torque—Fox suggests 15 Nm. Verify that the brake caliper aligns with the rotor and that the fork’s post mount matches your brake rotor size (typically 180 mm or 203 mm for eMTBs).

Initial Setup and Air Spring Adjustment

Setting sag correctly is essential for the fork to respond well over varied terrain. Fox recommends a baseline sag of 15–20% for the Float 36 Rhythm eMTB. Start by fully extending the fork and setting your air pressure using the shock pump, referencing the rider weight chart provided by Fox.

With full gear, mount the bike and compress the fork using body weight. Adjust the pressure until the O-ring on the stanchion indicates the desired sag. Recheck after a few cycles of compression.

The Float 36 Rhythm uses Fox’s EVOL (Extra Volume) air spring system, which reduces initial force required to activate the fork, enhancing small-bump sensitivity. The fork does not have externally adjustable volume spacers in this Rhythm trim, but volume tuning is still possible with internal disassembly for advanced users.

Rebound and Compression Adjustments

On the Float 36 Rhythm, rebound adjustment is available at the bottom of the right leg. Turn clockwise to slow rebound, counter-clockwise to speed it up. Start from the middle setting and fine-tune based on ride feedback—too fast and the fork will feel unstable; too slow and it will pack down over successive hits.

Compression is controlled via a single knob on top of the right leg, offering both open and firm modes. The GRIP damper used in this model balances performance and simplicity, making it less prone to hydraulic issues found in higher-end FIT4 or GRIP2 systems.

Routine Maintenance for Long-Term Performance

Fox recommends fork lowers service every 50 hours of riding or sooner in wet/muddy conditions. This includes removing the lowers, replacing oil, and cleaning the dust wipers.

Clean stanchions after each ride with a soft cloth and isopropyl alcohol. Inspect the seals for debris or wear. Keep the fork’s external surface dry to prevent corrosion.

Air spring service, which involves cleaning and re-greasing internal components, is recommended every 100 hours. This ensures consistent responsiveness and maintains correct spring progression.

Troubleshooting Common Issues

Fork feels harsh or unresponsive: This is often due to insufficient air pressure or old suspension fluid. Check sag first, then inspect for dry seals or worn bushings.

Excessive dive under braking: Increase air pressure slightly or use a firmer compression setting. Ensure sag is not exceeding 25%.

Top-out clunking noise: This could be a sign of low air pressure or internal damage. Perform a full air spring service if pressure is correct.

Leaking oil around the seals: Replace the dust wipers and foam rings. Use genuine Fox parts to ensure a proper seal.

Customization and Performance Optimization

For heavier riders or aggressive trail riders, consider replacing the air shaft with one of a different length to increase or decrease travel. The Float 36 Rhythm can typically be adjusted in 10 mm increments from 150 mm to 170 mm depending on model year.

Advanced riders may also internally modify compression tuning by changing oil weights or shims, although this requires expert knowledge and voids warranty. For most, tuning air pressure and rebound gives enough adjustability.

Compatibility with Other Drivetrain Components

The Float 36 Rhythm eMTB fork is designed around Boost hub spacing and tapered head tubes, making it compatible with most modern eMTBs. It supports 29-inch wheels and has tire clearance for up to 2.6-inch widths.

Brake mounts accommodate 180 mm rotors natively, with adapters available for 200+ mm sizes. Ensure your brake caliper is compatible with the fork’s post mount.

This fork integrates well with 1x drivetrains and dropper posts, which are standard on eMTBs. While it does not feature integrated cable routing, external guides allow clean and secure brake line routing.

Comparing the Float 36 Rhythm to Other Fox Forks

The Float 36 Rhythm sits below the Performance and Factory Series in Fox’s hierarchy. It lacks the Kashima coating and GRIP2 damper found in top-end models but maintains much of the stiffness and core ride quality of the 36 chassis.

Compared to the Fox 34 Rhythm, the 36 offers greater stiffness and support, making it the preferred option for eMTBs and aggressive trail riders. Riders seeking lighter weight for XC use may prefer the 34.

Factory and Performance Elite models offer finer compression tuning and more complex dampers, which benefit racers but may be overkill for recreational eMTB riders who want simplicity and durability.

Conclusion

The Float 36 Rhythm eMTB fork is a reliable, high-performance suspension option designed to meet the demands of electric trail bikes. With straightforward setup, strong support, and a well-balanced damper, it offers a confidence-inspiring ride for a wide range of trail riders. Regular maintenance and proper setup are key to unlocking its full potential.

By understanding how to install, tune, and maintain the Float 36 Rhythm, you can ensure long-term durability and performance that keeps pace with your eMTB adventures.