The Fox Float 36 Rhythm eMTB is a mid-tier suspension fork tailored for electric mountain bikes, designed to offer robust performance and long-term durability in demanding trail conditions. As part of the Fox 36 series, it blends the brand’s hallmark chassis stiffness with simplified internal architecture to ensure cost-effectiveness without compromising reliability. This article presents a detailed technical review, including installation, tuning, maintenance, and model-specific considerations.
Tools Required
- 6 mm and 5 mm hex wrenches
- Torque wrench [paid link] with Nm scale
- Suspension pump
- Lower leg removal tool
- 20 cc and 10 cc suspension oil
- Clean rags and degreaser
- Shock grease or Fox Float Fluid
- Star nut setter (if installing a new steerer)
Installation of the Float 36 Rhythm eMTB Fork
Installing the Float 36 Rhythm requires standard tools and procedures applicable to modern threadless steerer forks. However, attention to specific torque values and alignment is crucial for optimal performance.
Begin by cutting the steerer tube to fit your frame’s head tube and cockpit setup. Install a star nut (for alloy steerers) or insert for carbon steerers. Grease the steerer lightly, then slide the fork into the head tube with spacers and stem in place. Tighten the top cap and stem bolts to align the fork and preload the headset bearings properly.
Ensure the axle is compatible with your front hub — the Rhythm model typically uses a 15 x 110 mm Boost thru-axle. Tighten the axle to the manufacturer’s recommended 19 Nm.
Setup and Initial Adjustments
The Float 36 Rhythm eMTB fork employs a GRIP damper system, offering simplified adjustment for compression and rebound. It features an air-spring side and a sealed damper side, which requires specific air pressure settings based on rider weight and preference.
To set up:
- Inflate the air spring to the rider’s weight using the Fox pressure chart as a baseline.
- Set the rebound using the red dial at the bottom of the right fork leg. Turn clockwise for slower rebound.
- Adjust the compression using the blue knob on top of the damper leg. This is a sweep dial with open to firm settings.
- Perform a bounce test and a short trail ride to fine-tune.
Maintenance and Service Intervals
Routine maintenance is essential to preserve the performance and extend the life of the Float 36 Rhythm fork. Fox recommends lower leg service every 30-50 hours of ride time and full damper rebuilds every 125-150 hours.
Lower leg service involves removing the lower legs, cleaning stanchions, replacing wiper seals if needed, and refilling with specified suspension oil volumes. Grease all seals with Fox Float Fluid or equivalent before reassembly. Torque all bolts to specification, and confirm proper fork function before riding.
Common Setup Issues and Troubleshooting
Incorrect air pressure is the most frequent issue, leading to harsh or overly soft travel. Riders often overinflate, sacrificing traction and comfort. Use a sag measurement to verify correct pressure—approximately 20–25% of total travel is ideal.
Another common issue is rebound setting too fast, causing “bucking” behavior. Slowing down rebound can improve traction and control. If the fork feels sticky or harsh, inspect for dry seals or contamination within the lowers.
Axle alignment is critical. Ensure the axle is fully seated and torqued evenly. Misalignment can cause binding and reduce small bump sensitivity.
Customization and Performance Optimization
Although the Float 36 Rhythm lacks the high-end tunability of the Factory or Performance Elite versions, riders can still optimize performance:
- Install volume spacers to change the spring curve. More spacers increase progression and bottom-out resistance.
- Use lightweight fork oil to improve small-bump sensitivity.
- Upgrade the GRIP damper to GRIP2 (with Fox or third-party support) for more fine-tuned compression and rebound control.
Bar and stem setup can also influence fork feel. A lower stack height increases front-end precision, while a higher one adds comfort on rough descents.
Compatibility With Other Drivetrain Components
The Float 36 Rhythm is fully compatible with modern eMTB drivetrains, including 1×12 systems from Shimano and SRAM. Its Boost spacing ensures compatibility with wide-range cassettes and wider hubs, which improve spoke bracing and wheel strength.
Rotor size must be appropriate—Fox rates the 36 Rhythm for up to 203 mm rotors, which are commonly used on eMTBs. Ensure caliper adapters match both rotor and fork mount style (Post Mount 180).
Comparison With Similar Fork Models
Compared to the Fox 36 Performance Elite, the Rhythm version sacrifices the FIT4 or GRIP2 damper in favor of a simplified GRIP unit. This change reduces cost and maintenance complexity but slightly limits tuning precision.
Against RockShox’s Yari or Revelation, the 36 Rhythm offers a stiffer chassis and generally more consistent performance under load. The Rhythm’s robust 36 mm stanchions provide noticeable improvements in lateral and torsional stiffness over RockShox’s 35 mm options.
Final Verdict on Durability and Trail Capability
The Float 36 Rhythm eMTB is engineered with e-bike-specific use in mind, making it an excellent choice for riders who need stiffness and reliability without the premium price of a Factory model. It handles aggressive trail riding, sustained descents, and bike park sessions with ease. Though it lacks advanced adjustability, it offers predictable and dependable performance, which is often more valuable to everyday riders.
Frequently Asked Questions (FAQs)
How often should I service the Float 36 Rhythm fork?
Every 30–50 hours for lower leg maintenance and 125–150 hours for a full damper service.
Is the Float 36 Rhythm compatible with coil conversions?
No, this model is designed around an air spring and lacks the support structure for coil conversions.
Can I upgrade the GRIP damper to GRIP2?
Yes, although not officially endorsed by Fox, many riders upgrade to GRIP2 with support from suspension service providers.
Does this fork support 29” and 27.5” wheels?
Yes, the Float 36 Rhythm is available in both 27.5” and 29” versions. Ensure your model matches your frame’s intended wheel size.
What is the maximum tire width for this fork?
It supports tires up to 2.6” wide, typical for most modern trail and enduro bikes.
Are volume spacers included with the fork?
It usually comes with 1–2 spacers installed. Additional spacers can be purchased separately for tuning progression.