The Fox Float 36 Rhythm eMTB is a suspension fork designed for electric mountain bikes that require both strength and precision handling. Engineered for aggressive trail and enduro riding, the Float 36 Rhythm combines stiffness, support, and advanced damping characteristics. This article offers an in-depth guide to the features, installation, tuning, maintenance, and compatibility of the Float 36 Rhythm eMTB fork.
Tools Required
- Allen wrenches [paid link] (4mm, 5mm, 6mm)
- Torque wrench [paid link] with appropriate bits
- Shock pump
- Crown race setter
- Grease and suspension-specific lubricants
- Suspension fork cutting guide and saw
- Star nut setting tool
Installation Procedure
The Float 36 Rhythm eMTB fork requires a precise installation process to ensure optimal performance and safety. Begin by measuring and cutting the steerer tube to the correct length using a suspension fork cutting guide. Once cut, insert and set the star nut using the dedicated setting tool. Apply grease to the steerer tube and install the crown race securely.
Insert the fork into the head tube and align the stem and spacers before tightening the top cap. Secure the stem bolts incrementally, ensuring torque is applied evenly. Attach the front brake caliper to the post-mount tabs and align it properly to avoid rotor rub. The front wheel should be installed using the 15QR or Kabolt axle system, depending on the fork’s configuration.
Adjusting Air Spring and SAG
The Float 36 Rhythm utilizes a Float EVOL air spring, which provides a plush initial stroke with good mid-stroke support. To set it up correctly, determine the rider’s weight with full gear and consult Fox’s air pressure chart. Use a shock pump to inflate the air chamber to the recommended pressure.
To check sag, use an O-ring or zip tie on the stanchion and have the rider sit on the bike in their normal riding position. Ideal sag for trail and enduro riding typically falls between 15% and 20% of total travel. Fine-tune air pressure until the correct sag is achieved.
Tuning the GRIP Damper
The Rhythm series comes equipped with the GRIP damper, a sealed cartridge design based on Fox’s GRIP2 system but with simplified external adjustments. Riders can tune rebound and low-speed compression via external dials.
Set rebound by turning the red knob at the bottom of the fork leg. A slower rebound (more damping) improves control on rough terrain, while a faster rebound (less damping) increases responsiveness. Low-speed compression, adjusted via the blue knob, helps manage fork movement during braking and pedaling. Start in the middle of the adjustment range and fine-tune based on terrain and riding style.
Routine Maintenance
Regular servicing extends the life and performance of the Float 36 Rhythm eMTB fork. Fox recommends a lower leg service every 50 hours of riding and a damper service every 125 hours.
Lower leg service includes removing the lowers, cleaning the inside, replacing foam rings, and adding fresh suspension oil. Always use suspension-specific fluids and observe torque specifications when reassembling the fork.
During damper service, it’s crucial to maintain internal seals and inspect for contamination or wear. This service is more technical and may require sending the fork to an authorized Fox service center.
Troubleshooting Common Issues
Fork setup issues can often be traced to incorrect air pressure, improper rebound settings, or inadequate lubrication. If the fork feels harsh or unresponsive, verify the sag and adjust air pressure accordingly.
Inconsistent rebound may indicate oil contamination or worn seals in the damper. A fork that feels sticky or lacks initial sensitivity often benefits from fresh lower leg lubrication. Air loss over time points to faulty air seals, which should be replaced during routine service intervals.
Customization and Performance Optimization
Although the Rhythm trim is considered an entry-level option within the 36 series, it still offers considerable tuning potential. Volume spacers can be added to the air spring to alter progressivity. Reducing volume increases ramp-up, ideal for aggressive riders who want more bottom-out resistance.
Brake mount adapters allow for the use of larger rotors, improving braking performance on steep descents. Swapping the axle to a Kabolt version slightly reduces weight while maintaining stiffness.
Riders can upgrade to a GRIP2 damper if they desire additional high-speed compression and rebound adjustment, although this requires compatibility checks and professional installation.
Comparison with Similar Models
The Float 36 Rhythm is often compared to the Performance and Factory models within the same family. Unlike the Factory version, the Rhythm uses a GRIP damper instead of GRIP2 and lacks the Kashima-coated stanchions, resulting in slightly more friction but lower cost.
While the Rhythm model is heavier due to thicker castings, it offers improved durability for eMTB applications. Compared to RockShox’s Yari or ZEB Select, the Float 36 Rhythm provides a better balance of chassis stiffness and mid-stroke support, though with slightly fewer external adjustments.
Compatibility Considerations
The Float 36 Rhythm is designed for eMTBs and pairs best with full-suspension frames designed around 150mm to 170mm front travel. It supports both 29″ and 27.5″ wheels, depending on the specific fork SKU.
Brake compatibility includes post-mount calipers with rotor sizes from 180mm to 203mm without the need for adapters in many cases. The axle spacing is Boost (110mm x 15mm), which matches most modern eMTB hubs.
The fork crown clearance supports wide tires up to 2.6”, making it suitable for technical terrain. Tapered steerer compatibility ensures it fits modern head tubes, but older bikes with straight head tubes require conversion headsets.
Conclusion
The Fox Float 36 Rhythm eMTB fork brings capable suspension performance to electric mountain bikes with a focus on durability, stiffness, and user-friendly tuning. While it omits some of the premium features of higher-end models, its simplified design and robust chassis make it a top contender for riders seeking reliable trail performance. Proper installation, regular maintenance, and thoughtful tuning allow riders to maximize its potential on diverse terrain.