The Fox Float 36 Rhythm eMTB suspension fork is engineered for aggressive trail and enduro riders who demand consistent damping, controlled travel, and enhanced comfort on e-mountain bikes. This guide provides an in-depth look into the installation, adjustment, maintenance, and optimization of this specific model. It also offers compatibility guidance and troubleshooting insights to ensure peak performance.
Tools Required
- 5mm and 6mm Allen keys [paid link]
- Torque wrench [paid link]
- Suspension pump (shock pump)
- Lower leg removal tool
- Isopropyl alcohol and clean rags
- Fox 20wt Gold oil (for lower service)
- Slickoleum or equivalent suspension grease
- Fox seal kit (for periodic service)
Installing the Float 36 Rhythm eMTB Fork
Installation of the Float 36 Rhythm eMTB must be performed carefully to ensure proper function and safety. Begin by confirming compatibility with your bike’s head tube and axle standard. The fork features a 1.5″ tapered steerer and is available in Boost 110 spacing.
First, cut the steerer tube to the appropriate length based on your frame and headset stack height. Use a guide to ensure a straight cut and finish the edge with a file. Install the star nut with the correct tool and press the crown race for your headset onto the steerer. Mount the fork onto the bike, install the stem and spacers, and tighten everything to the specified torque using a torque wrench [paid link]. Ensure the axle is properly aligned and torqued once the front wheel is installed.
Initial Setup and Sag Adjustment
To achieve optimal comfort and control, the air spring must be correctly set based on rider weight and riding style. The Float 36 Rhythm uses Fox’s Evol air spring system, which supports tunable negative and positive chambers for plush initial travel.
Inflate the fork with the shock pump to match Fox’s recommended pressure chart, typically starting around 75–90 psi for a 70 kg rider. Sit on the bike with full gear and let the suspension settle. Sag should measure between 15% to 20% of total travel, equivalent to 21–28 mm for a 160 mm fork. Adjust air pressure incrementally to fine-tune this setting.
Rebound and Compression Tuning
The fork includes adjustable rebound and low-speed compression via external knobs. Rebound controls how quickly the fork returns after compression, while compression fine-tunes how the fork behaves under weight shifts and impacts.
Begin with the rebound set to the middle of the adjustment range. Turn clockwise to slow rebound or counterclockwise to speed it up. For eMTBs, a slightly slower rebound is often ideal due to added weight. Set compression damping to a moderate level to maintain comfort while climbing or descending rough terrain. Trail riders may prefer more open settings, while enduro riders can stiffen compression to resist dive on steep descents.
Routine Maintenance
Regular maintenance preserves suspension performance and extends service life. After every 25 hours of riding, clean the stanchions and dust wipers with a clean rag and inspect for oil leakage or contamination. Every 50 hours, perform a lower leg service by removing the fork lowers, cleaning internal surfaces, and replacing bath oil and foam rings.
At 125 hours, a full damper and air spring service is recommended. Use Fox-specific parts and oils. Apply a thin coat of suspension grease on air spring seals and reassemble carefully. Always verify correct torque on axle and brake caliper bolts post-service.
Troubleshooting Common Issues
Incorrect setup or wear can lead to diminished performance. If the fork feels harsh, check air pressure and ensure proper sag is set. A squishy or inconsistent feel often indicates air loss or oil contamination. If rebound becomes erratic, inspect the damper for fluid loss and service as needed.
Fork dive under braking may be caused by low compression damping or excessive sag. Adjust the compression knob to a firmer setting and ensure air pressure matches your riding weight. Unusual noises or knocking may signal internal wear or inadequate lubrication, requiring immediate inspection.
Performance Optimization for eMTBs
E-mountain bikes place unique demands on suspension components due to added weight and torque. The Float 36 Rhythm’s chassis is reinforced to handle these stresses. Consider increasing air pressure slightly above traditional recommendations for better mid-stroke support. Riders may also install volume spacers in the air spring to fine-tune progression and bottom-out resistance.
For riders who prefer technical climbs, softening low-speed compression enhances traction. Conversely, those focusing on descents can dial in more compression to maintain front-end stability under braking forces.
Compatibility with Other Drivetrain and Brake Systems
The Float 36 Rhythm eMTB fork is designed for seamless integration with modern drivetrains and braking systems. Its Boost 110 spacing allows use with wide-range drivetrains and wide-profile tires. The post-mount brake system supports 180 mm rotors natively, with adapters available for 203 mm setups.
Ensure brake caliper alignment and rotor clearance during setup, especially if using four-piston calipers. Avoid over-torquing mounting bolts, which can deform the caliper or mount tabs.
Comparing the Float 36 Rhythm with Other Models
Compared to the Fox 36 Performance Elite or Factory versions, the Rhythm model uses a GRIP damper instead of the more advanced GRIP2. This simplifies tuning but still offers robust trail performance. The Rhythm also features a different chassis with 6000-series aluminum and slightly heavier castings.
Despite its lower price point, the Rhythm fork delivers excellent ride quality for eMTB applications. Riders seeking more adjustability might opt for the Factory version, but many will find the Rhythm more than sufficient for demanding trails.
Customizing for Rider Preference
The fork’s air spring can be customized by inserting volume spacers, allowing riders to adjust the progression of the travel. More spacers increase resistance at the end of the stroke, ideal for aggressive descenders. Fewer spacers create a more linear feel for technical trail riding.
GRIP damper tuning is limited to external compression and rebound, but changes in air pressure and volume spacers often provide ample control. Riders focused on specific terrain should experiment with these elements to match their comfort and control preferences.
FAQs
How often should I service the Float 36 Rhythm eMTB fork?
Lower leg service is recommended every 50 hours of riding, and a full service every 125 hours.
Can I upgrade the GRIP damper in the Rhythm fork to GRIP2?
The chassis of the Rhythm fork differs slightly, so damper upgrades may require compatibility checks. Consult Fox’s technical documents or a suspension specialist.
Is the Float 36 Rhythm eMTB compatible with a 29-inch front wheel?
Yes, this model is available in 29-inch configurations and is optimized for trail and enduro geometry.
What tire width can I use with this fork?
The Boost 110 spacing accommodates up to 2.6″ wide tires comfortably, providing enhanced grip and cushion.
How can I tell if I need to add volume spacers?
If you regularly bottom out the fork on hard hits, adding volume spacers will increase end-stroke support and reduce harsh impacts.
Does this fork support e-bike certification?
Yes, the Float 36 Rhythm eMTB is specifically reinforced and rated for use on Class 1 e-mountain bikes.
Conclusion
The Float 36 Rhythm eMTB suspension fork offers a finely balanced combination of comfort, control, and reliability tailored for the demands of electric mountain biking. With the right setup and regular maintenance, this fork enhances trail performance and adapts to a wide range of rider needs. Whether you’re a weekend rider or a dedicated enduro competitor, mastering the Float 36 Rhythm’s capabilities unlocks a smoother and more responsive ride.