The Float 36 Rhythm eMTB fork from Fox is engineered for aggressive trail riding and e-MTB applications, offering a balance between performance, adjustability, and durability. Designed with a GRIP damper and EVOL air spring, this fork delivers consistent control on demanding terrain. Tuning it correctly can drastically improve your ride quality and ensure your suspension performs optimally across a wide range of trail conditions.
This guide walks you through installation, adjustment, maintenance, and troubleshooting for the Fox Float 36 Rhythm eMTB fork. It also includes customization tips, compatibility insights, and a comparison with similar models to assist you in making an informed decision.
Tools Required
- 6 mm and 4 mm hex keys [paid link]
- Torque wrench [paid link] (Nm scale)
- Suspension pump
- Clean microfiber cloths
- Suspension-specific grease
- Shock oil (Fox 20wt Gold)
- Fox volume spacers
- Oil pan and nitrile gloves
Installation Process
Installing the Float 36 Rhythm eMTB fork begins with careful attention to torque specs and headset alignment. Before mounting, ensure your steerer tube is properly cut and deburred.
Start by inserting the steerer through the head tube, aligning your stem and spacers. Secure the top cap to preload the headset bearings. Then, evenly torque the stem bolts to 5.5 Nm. Finally, attach the front brake caliper and route the cable along the fork arch using the built-in guide.
Make sure the fork is not over-compressed when tightening the headset, as this can introduce play or hinder smooth steering.
Initial Setup and Suspension Sag
Proper setup starts with setting the correct sag. For the Float 36 Rhythm eMTB, Fox recommends 15–20% sag for trail use.
Deflate the fork using the Schrader valve, then inflate it to your recommended pressure based on body weight. Use a ruler or zip-tie method to measure sag—compress the fork with full gear on and note the travel used. Adjust the air pressure until you reach the desired percentage of total travel (typically 25–35mm for a 160mm fork).
Always set sag before adjusting rebound or compression.
Rebound and Compression Adjustment
The Float 36 Rhythm uses a GRIP damper that offers open bath performance with easy adjustability. The rebound dial is located at the bottom of the right fork leg, while the compression adjuster is the black knob on top.
- Rebound: Turn clockwise for slower rebound (better for rocky descents), and counter-clockwise for faster rebound (for smoother terrain). A good baseline is halfway out, then adjust based on how the fork recovers after impacts.
- Compression: Use the top knob to fine-tune the fork’s firmness. Clockwise stiffens the compression, suitable for climbing or high-speed trail riding; counter-clockwise softens the ride for technical descents.
Air Spring Tuning and Volume Spacers
The Float 36 Rhythm fork is equipped with an EVOL air spring, which provides a linear compression curve with excellent small bump sensitivity. However, tuning the air spring volume with spacers can help you achieve a more progressive feel.
To add spacers:
- Remove air pressure completely.
- Unscrew the top cap with a 6 mm hex key.
- Add or remove volume spacers by snapping them onto the shaft.
- Reinstall the top cap and torque to 26 Nm.
- Re-inflate to your desired pressure.
Adding spacers increases bottom-out resistance, ideal for aggressive riders or larger impacts.
Routine Maintenance Procedures
Fox recommends performing a lower leg service every 30–50 hours of riding. This includes replacing the oil bath, cleaning seals, and inspecting bushings for wear.
To perform the service:
- Remove the wheel and brake caliper.
- Loosen the foot nuts and slide off the lower legs.
- Drain old oil into a pan.
- Clean internals with isopropyl alcohol and re-lubricate seals with suspension grease.
- Reinstall lowers, inject new oil (10cc per leg), and torque foot nuts to 7 Nm.
For full damper or air spring overhauls, refer to Fox’s advanced service intervals at 125–200 hours.
Troubleshooting Common Issues
Inconsistent rebound or harsh ride
Check air pressure and damper settings. Rebound too fast can lead to pogo-like behavior, while insufficient air pressure can bottom out the fork.
Oil seepage near the seals
This usually indicates worn dust wipers or overfilled bath oil. Perform a lower leg service and replace seals if needed.
Fork not returning to full travel
Possible causes include stuck negative air spring or excess friction. Release air, cycle the fork, and re-inflate to reset internal equalization.
Customization for Improved Performance
The Float 36 Rhythm offers limited but effective tuning potential. Riders looking for enhanced performance can:
- Upgrade the GRIP damper to a GRIP2 cartridge for high-speed compression/rebound tuning.
- Switch to lightweight volume spacers for fine-tuned ramp control.
- Experiment with low-friction SKF seals to improve small bump compliance.
Model Compatibility and Integration
The Float 36 Rhythm eMTB is designed to pair with modern long-travel eMTB frames. It uses a 15×110 Boost axle and is compatible with both 29″ and 27.5+” wheels depending on fork offset.
Ensure your head tube and headset support a tapered steerer (1.5″ to 1-1/8″). The fork is compatible with all Fox rear shocks for matched damping performance and offers seamless integration with e-bike weight and torque profiles.
Comparison with Similar Models
| Feature | Float 36 Rhythm eMTB | Float 36 Performance | Float 36 Factory |
|---|---|---|---|
| Damper | GRIP | GRIP2 | GRIP2 |
| Air Spring | EVOL | EVOL | EVOL |
| Adjustability | Rebound/Compression | HSC/LSC/Rebound | HSC/LSC/Rebound |
| Coating | Standard Anodized | Black Anodized | Kashima Coated |
| Weight | Mid-tier | Mid-tier | Lightest |
| Intended Rider | Entry to mid-level | Advanced | Expert/Pro |
The Rhythm is best suited for riders prioritizing value and simplicity, while the Factory version targets maximum performance and weight savings.
FAQs
1. How much air pressure should I run in my Float 36 Rhythm fork?
Air pressure depends on rider weight. Fox provides a tuning chart, but a rough estimate is 1 psi per pound of rider weight divided by 10. Always check sag after adjusting pressure.
2. Can I use the Float 36 Rhythm on a non-eMTB bike?
Yes, though it’s optimized for eMTB use due to chassis stiffness and damper tuning. It can still function well on standard trail bikes if dimensions match.
3. How often should I service the Float 36 Rhythm fork?
Lower leg maintenance is advised every 30–50 hours. Full damper and air spring service is recommended at 125–200 hours or annually.
4. What is the maximum rotor size compatible with this fork?
The Float 36 Rhythm supports up to a 203mm rotor directly. Larger rotors require adapters.
5. Can I convert my Rhythm to GRIP2 damping?
Yes. The upgrade is possible through authorized Fox service centers and includes damper cartridge replacement and tuning.
6. Is Kashima coating available for this model?
No, the Rhythm line uses standard anodized stanchions. To access Kashima-coated performance, consider upgrading to the Factory series.
Conclusion
Tuning your Float 36 Rhythm eMTB fork correctly transforms your riding experience. Whether you’re chasing better small bump sensitivity, more bottom-out support, or simply need to fine-tune air pressure and rebound, this guide provides all the tools and steps required. With regular maintenance and thoughtful adjustments, this fork can serve as a robust and responsive suspension platform for any eMTB trail adventure.