The Fox Float 36 Rhythm eMTB is a dependable and performance-oriented suspension fork designed for aggressive trail riding and eMTB-specific demands. Maintaining its optimal performance requires consistent inspection, routine service, and correct installation techniques. This article offers a complete guide to keeping your Float 36 Rhythm in peak condition, focusing on installation, adjustment, preventive maintenance, troubleshooting, and compatibility checks.
Tools Required
- 3mm, 4mm, 5mm, and 6mm Allen wrenches [paid link]
- Torque wrench [paid link] (2–20 Nm range)
- Clean lint-free cloths
- Suspension fork-specific grease
- Suspension oil (Fox 20wt Gold for lower leg service)
- Shock pump
- Isopropyl alcohol (minimum 90%)
- Seal driver and pick tool
- Oil pan or waste container
- Gloves and safety glasses
Installation Procedure
Installing the Fox Float 36 Rhythm eMTB fork requires precision to prevent creaking, poor alignment, or improper torque. Begin by verifying the steerer tube length and trimming it if needed. The crown race must be pressed on securely to match the headset’s bottom bearing.
Slide the fork into the head tube, ensuring spacers and the stem clamp are positioned evenly. Gradually torque the stem bolts to 5 Nm in an alternating pattern. Finally, align the front brake caliper with the post mounts and secure it using the specified torque (6–8 Nm), centering the rotor in the caliper to prevent rubbing.
For eMTBs, double-check the steerer clamp’s torque after the first few rides due to the additional stress caused by motorized pedaling forces.
Suspension Setup and Adjustment
Correct air pressure and rebound settings define how the Float 36 Rhythm eMTB behaves under load. Start with the rider’s weight, using Fox’s recommended air pressure chart for the 36 series. Connect the shock pump, pressurize the fork, and confirm pressure with the rider in full gear standing in a neutral riding position.
Set the rebound by turning the red knob at the fork’s bottom right leg. Begin at the mid-setting and adjust based on trail feedback: faster rebound for smoother trails and slower for technical descents.
The Float 36 Rhythm typically includes a GRIP damper, which has a sweep-style compression dial. Turn clockwise for firmer support during climbs or aggressive terrain and counterclockwise for a more supple feel on descents.
Routine Maintenance Schedule
Fox recommends lower leg servicing every 50 hours and a full damper rebuild every 125 hours of riding. Frequent inspections prevent seal wear, oil contamination, and performance loss.
To perform a lower leg service:
- Remove the fork from the bike.
- Drain old bath oil by removing the lower leg bolts and pulling the lowers off the stanchions.
- Clean all surfaces using isopropyl alcohol and a lint-free cloth.
- Replace dust wipers and foam rings as needed.
- Apply new 20wt Gold oil (40ml per leg) and reinstall the lowers carefully, ensuring the bushings engage the stanchions evenly.
Regular cleaning of stanchions after each ride extends seal life. Use a damp cloth to remove debris without damaging the finish.
Troubleshooting Common Issues
Excessive stiction or harsh ride feel:
Check for dry or contaminated foam rings. Reapply fork oil to restore lubrication. Inspect seals for wear.
Loss of travel or “sag creep”:
Inspect air pressure regularly. Air loss may indicate a faulty air spring seal. Disassemble the air spring side, inspect O-rings, and apply suspension grease during reassembly.
Oil leakage near dust wipers:
Check if the wipers are seated correctly. If oil pools excessively, the oil bath level may be too high or the wiper seals may be worn.
Clicking noises under compression:
Tighten axle and brake caliper bolts to specification. Check headset preload. Creaks can also stem from dry steerer tube interfaces.
Performance Optimization and Customization
Advanced riders can optimize their Float 36 Rhythm eMTB fork by tuning volume spacers and damper characteristics.
Volume Spacers:
Adding spacers increases bottom-out resistance. Removing them results in a more linear travel. Most eMTB riders benefit from 2–3 spacers for better mid-stroke support.
Oil Weight and Bath Level Tweaks:
Using a slightly heavier damper oil increases damping control. However, only attempt this with experience and understanding of damper architecture.
Custom Graphics and Fork Protectors:
While cosmetic, custom decals and fork guards protect from trail debris and personalize your setup.
Compatibility with Drivetrain and Frame Components
The Fox Float 36 Rhythm eMTB is designed with Boost spacing (15x110mm) and tapered steerer tube compatibility. It’s crucial to confirm that your frame and wheelset match these standards. Additionally, the fork’s axle-to-crown measurement and rake affect geometry—always verify frame geometry compatibility for intended ride feel.
The GRIP damper is compatible with eMTB-level brake and wheel loads. Ensure brake calipers are Post-Mount compatible and that rotors fall within the recommended size range (180–203mm).
Model Comparison: Float 36 Rhythm vs. Performance Elite
While both forks share the same chassis, the key differences lie in internal damping. The Rhythm uses the GRIP damper, while Performance Elite utilizes GRIP2, offering external high/low-speed compression and rebound.
- GRIP (Rhythm): Simpler, lighter, tool-free compression sweep
- GRIP2 (Performance Elite): Advanced tuning, better for competitive or aggressive riders
- Weight: Rhythm fork is slightly heavier due to thicker stanchions
- Target User: Rhythm suits budget-conscious eMTB riders; Performance Elite is for experienced, fine-tuning riders
This distinction matters when comparing upgrade paths or when selecting a fork for your riding needs.
FAQs
Q1: How often should I service my Float 36 Rhythm eMTB fork?
Every 50 hours for lower leg maintenance, and every 125 hours for a full damper and air spring service.
Q2: Can I replace the GRIP damper with a GRIP2 in the Rhythm chassis?
No, the Rhythm chassis is not compatible with GRIP2 internals due to different casting tolerances and design.
Q3: What air pressure should I use in my Float 36 Rhythm fork?
Refer to Fox’s air pressure chart based on rider weight. Fine-tune after initial setup based on sag and ride feel.
Q4: Is it normal for oil to be visible around the fork seals?
A light oil film is normal, but pooling or dripping indicates seal or foam ring issues that require attention.
Q5: Can I run a 29” wheel on a 27.5” Float 36 Rhythm fork?
No, doing so risks crown clearance and geometry issues. Always match wheel size to fork specifications.
Q6: What’s the recommended maximum rotor size for this fork?
203mm is the maximum rotor size supported for optimal braking performance on eMTBs.
By following these care tips and procedures, you can keep your Float 36 Rhythm eMTB performing smoothly on every ride. Regular inspection, precise setup, and preventative maintenance extend the fork’s life and enhance trail confidence.