The Fox Float 36 Rhythm eMTB suspension fork is engineered specifically for electric mountain bikes, delivering a robust platform for aggressive trail riding. Combining strength, sensitivity, and adjustability, this model sits at the intersection of performance and reliability. Built with a 36mm chassis, the Float 36 Rhythm provides the precise damping control and structural integrity needed to handle the added weight and force of an eMTB setup.

This guide provides a technical breakdown of the Float 36 Rhythm eMTB fork, covering installation, tuning, maintenance, common setup issues, customization strategies, compatibility considerations, and comparative insights to assist both novice and experienced riders.

Tools Required

• 5mm and 6mm Allen keys [paid link]
• Torque wrench [paid link] with Nm scale
• Shock pump (up to 300 PSI)
• Suspension-specific grease
• Clean lint-free cloths
• Isopropyl alcohol (for cleaning)
• Crown race setter (if applicable)
• Star nut installation tool (if applicable)

Installation Procedure

Correct installation is essential to ensure optimal performance and safety. Begin by preparing the steerer tube. If it is uncut, measure carefully against your bike’s head tube and spacers. Use a pipe cutter or saw guide for precision. Install the star nut if one is not factory-installed, and ensure it is set to the correct depth.

Next, apply a light layer of suspension grease to the steerer tube and crown race area. Press the crown race into place using the appropriate tool. Insert the fork into the head tube, followed by spacers and the stem. Preload the headset by tightening the top cap before torquing the stem bolts to manufacturer specs.

Install the front wheel, ensuring the 15x110mm Boost axle is seated correctly. Tighten the axle and check for fork alignment. The front brake caliper may require repositioning—use the 6mm Allen key to adjust the caliper so the pads align cleanly with the rotor. Tighten all bolts using a torque wrench [paid link] to avoid overtightening or under-tightening.

Initial Setup and Adjustment

The Float 36 Rhythm eMTB uses Fox’s GRIP damper, providing reliable compression and rebound control. The initial air pressure should be set according to the rider’s weight. Fox recommends a starting point of 1 PSI per pound of rider weight, including gear. Use the shock pump to dial in pressure and cycle the fork through its travel several times to equalize positive and negative air chambers.

Rebound settings can be adjusted via the red knob on the bottom of the right leg. Turn it clockwise for slower rebound or counterclockwise for faster response. Compression adjustment is controlled via the blue dial atop the right leg. This three-position lever—Open, Medium, and Firm—allows quick changes on the trail.

Maintenance Guidelines

Routine maintenance extends the lifespan and preserves the performance of the fork. Fox recommends lower leg service every 50 riding hours, including replacing the bath oil and cleaning the wiper seals. Full damper and air spring service should occur every 125 hours or annually, whichever comes first.

Clean the stanchions after every ride using a damp, lint-free cloth. Avoid pressure washers, as water ingress can compromise internal components. Inspect the wiper seals and foam rings regularly for wear and contamination. Use isopropyl alcohol to clean the exterior surfaces before any service work.

Troubleshooting Common Setup Issues

Riders often experience initial issues such as excessive dive or harsh top-out. These are typically due to incorrect air pressure or rebound settings. Too low air pressure causes excessive travel use, while too fast rebound can lead to pogoing.

Stiction or lack of sensitivity often indicates dry seals or dirty bushings. If the fork feels sticky or unresponsive, a lower leg service is likely needed. Leaking oil around the seals points to worn wipers or overfilled bath oil chambers.

Fork creaking under load often originates from headset or crown/steerer interface—not the fork chassis itself. Verify all bolts are torqued properly and inspect the headset bearing preload.

Customization and Performance Optimization

For riders looking to tune performance beyond factory settings, the Float 36 Rhythm allows for several custom options. Air volume spacers can be added or removed to change the spring curve. Fewer spacers result in a more linear feel, suitable for lighter riders or smoother trails. Adding spacers creates a more progressive ramp-up, ideal for aggressive riding or heavier riders.

Additionally, tuning the GRIP damper internally for shim stack changes is possible but should be handled by a trained suspension technician. Upgrading to performance SKF low-friction seals also enhances small bump compliance.

For eMTB riders, consider using a stiffer front tire casing and optimizing cockpit setup (bar width, stem length) to fully exploit the fork’s capabilities.

Compatibility with Other Drivetrain and Frame Components

The Float 36 Rhythm eMTB is designed with Boost axle spacing (15x110mm), making it compatible with most modern eMTB frames and wheels. It supports 29” and 27.5+ wheel sizes with up to 2.8” tire clearance.

Brake compatibility includes 180mm to 203mm rotors via post mount. Ensure your caliper and rotor setup matches the fork’s mount standard. The tapered steerer tube fits integrated headsets in most eMTB frames. Verify that the crown-to-axle height is compatible with your frame geometry to maintain proper handling.

It’s also essential to confirm your eMTB’s down tube clearance with the fork’s maximum travel. The Float 36 Rhythm is typically available in 150mm to 170mm travel options.

Model Comparison: Float 36 Rhythm vs. Factory and Performance Series

Compared to Fox’s Factory and Performance Elite forks, the Rhythm version features a simplified GRIP damper and aluminum upper tubes instead of Kashima-coated stanchions. This results in a more affordable price point with slightly reduced small-bump sensitivity and fewer tuning options.

The Factory model uses the FIT4 or GRIP2 damper, offering external high- and low-speed compression and rebound adjustments. It also features Kashima coating for reduced friction. However, for eMTB use, the Rhythm’s robust chassis and simplified tuning offer better value for less technical riders or those prioritizing durability.

Performance models sit between Rhythm and Factory, offering GRIP dampers with black anodized stanchions. They are a solid upgrade path for riders seeking more adjustability without the price of the Factory line.

Conclusion

The Fox Float 36 Rhythm eMTB suspension fork is a compelling option for riders seeking reliable performance without the complexity or cost of high-end race forks. Its durable design, easy adjustability, and compatibility with modern eMTB standards make it a top choice for aggressive trail and enduro applications. With regular maintenance and thoughtful setup, it delivers the consistency and confidence demanded by electric mountain biking.