The Fox Float 36 Rhythm eMTB suspension fork is built to handle aggressive trail riding and eMTB-specific loads. Designed with GRIP damper technology and optimized for stiffness and compliance, it offers consistent performance across diverse terrain. To keep this fork operating smoothly, home service is essential. This guide covers the installation, adjustment, maintenance, and optimization of the Float 36 Rhythm, along with compatibility insights and troubleshooting.
Tools Required:
- 26 mm socket and torque wrench [paid link]
- 10 mm and 5 mm hex keys [paid link]
- Suspension fork oil (Fox 20wt Gold and Float Fluid)
- Plastic syringe or oil volume tool
- Rubber mallet
- Clean rags and isopropyl alcohol
- Pick tool
- Snap ring pliers
- Suspension grease (e.g., Slickoleum)
- Torque specs reference chart
Understanding the Float 36 Rhythm eMTB Fork
The Float 36 Rhythm is a 36 mm stanchion fork, optimized for eMTBs with a robust chassis and the GRIP damper. It features EVOL air spring technology for improved sensitivity and a sweep-adjustable compression knob. Unlike Factory or Performance Elite versions, the Rhythm variant uses a different stanchion material and lacks Kashima coating, but offers durable, affordable trail performance.
Installation Guidelines
Proper installation ensures longevity and optimal fork performance. Begin by confirming the steerer tube length and fork offset match your bike’s geometry requirements.
Insert the steerer tube into the headtube, add spacers and stem, then torque the stem bolts according to specifications. Use a crown race setter to seat the headset crown race precisely. Check the fork alignment with the front wheel before tightening axle bolts.
Ensure the front brake caliper is centered. If the fork includes a bolt-on axle, follow Fox’s torque guidance (typically 19-22 Nm for the pinch bolts).
Routine Maintenance Overview
Regular servicing intervals are critical. Fox recommends 30-hour lower leg service and 125-hour damper and air spring service.
Lower Leg Service:
This includes cleaning and re-lubricating the fork’s lower legs and replacing bath oil. Drain old oil, remove the lower legs, clean the internals, and apply fresh 20wt Gold oil. Replace foam rings if dirty or dry. Grease the dust wipers and reassemble using snap ring pliers to secure the wiper seals.
Damper and Air Spring Service:
After 125 hours or a season of riding, disassemble the fork completely. Remove the air spring assembly and damper shaft. Clean each component using isopropyl alcohol, inspect O-rings and seals, and replace any damaged parts. Apply suspension grease to moving parts before reinstalling.
Adjusting for Performance
Setting sag and air pressure is the first step in tuning. Use Fox’s air pressure chart as a baseline, then fine-tune to rider weight and terrain.
Adjust rebound using the red knob at the fork base. Turning it clockwise slows rebound, while counter-clockwise speeds it up. Use the compression sweep lever on top of the GRIP damper to adjust low-speed compression.
For eMTB use, increase air pressure slightly to compensate for added bike weight, and consider running more compression damping to reduce fork dive under load.
Troubleshooting Common Set-Up Issues
Some riders experience poor small bump compliance or excessive fork dive. Begin by verifying air pressure and sag settings. Excessive sag can be corrected by adding air or volume spacers.
Fork topping out may indicate insufficient rebound damping or a dry air spring. Add 3-5 clicks of rebound or service the air side. Harsh compression often points to too much pressure or excessive compression damping; back off the compression sweep.
If oil leakage appears at the dust seals, inspect for worn wipers or dry foam rings. Replace them during a lower leg service.
Customization and Tuning Options
You can tune the Float 36 Rhythm’s air spring by adding volume spacers. This affects progression—more spacers create a firmer ramp-up at the end of travel, ideal for aggressive descending.
The GRIP damper is not externally upgradeable to GRIP2 but offers internal tuning options. Advanced users may re-shim the compression stack or modify rebound circuits, though this should be done with caution and expertise.
Axle stiffness can also be improved using aftermarket bolt-on axles, reducing torsional flex and increasing steering precision.
Compatibility with Drivetrain and Frame Standards
The Float 36 Rhythm is compatible with both Boost and non-Boost front hubs (depending on model variant). It fits 29” and 27.5” wheels with appropriate tire clearance, up to 2.8” in width.
Ensure rotor size is within the fork’s brake mount standard (typically 180 mm direct mount, up to 203 mm with adapters). Cable routing is designed for clean internal brake hose paths using zip ties or clamp guides.
It pairs well with modern drivetrains including SRAM Eagle and Shimano 12-speed systems, with no interference issues at the crown or steerer.
Comparing the Float 36 Rhythm to Similar Forks
Compared to the Fox 36 Performance or Factory versions, the Rhythm is more budget-friendly but lacks the Kashima coat and GRIP2 damper. However, it delivers comparable stiffness and nearly identical chassis design.
Versus RockShox Yari or ZEB, the Float 36 Rhythm offers a more refined damper feel and a lighter chassis, though it may lack the extensive adjustability found on RockShox’s Charger 3 damper.
Its value-to-performance ratio makes it an ideal choice for eMTB riders who prioritize durability and simplicity over high-end adjustability.
FAQs
1. How often should I service my Float 36 Rhythm eMTB fork?
Fox recommends a lower leg service every 30 hours and a full damper/air service every 125 hours of riding.
2. Can I upgrade the GRIP damper to GRIP2?
No, the Rhythm chassis is not compatible with the GRIP2 damper due to internal differences in design and fitment.
3. What oil does the Float 36 Rhythm use?
Use Fox 20wt Gold oil in the lower legs and Float Fluid in the air chamber during air spring service.
4. How can I reduce fork dive on steep descents?
Add volume spacers to increase spring progression, or adjust low-speed compression using the damper knob.
5. Is the Float 36 Rhythm compatible with a 203 mm rotor?
Yes, with the correct adapter, the fork can support 203 mm rotors safely.
6. Why is my fork making a top-out clunk?
This could be due to low rebound damping or lack of lubrication in the air spring. Adjust rebound and check air spring condition.