The Fox Float 36 Rhythm eMTB suspension fork is a robust and high-performance component engineered specifically for aggressive trail and enduro riding on electric mountain bikes. Designed with a GRIP damper and a stiff 36mm chassis, this fork offers excellent control, support, and adjustability. However, optimizing its performance requires precise setup and periodic tuning. This guide provides a complete overview of how to adjust, maintain, and troubleshoot the Fox Float 36 Rhythm eMTB suspension fork to achieve superior ride quality and bike control.
Tools Required
- Shock pump (0–300 psi)
- Torque wrench [paid link] with 4mm, 5mm, and 6mm hex bits
- Suspension grease (such as Fox Float Fluid)
- Digital caliper [paid link] (for measuring sag)
- Clean shop rag and isopropyl alcohol
- Allen keys [paid link] and flat-blade screwdriver
Factory Settings Overview
The Float 36 Rhythm eMTB typically comes with preset compression and rebound adjustments. The air spring, however, requires tuning based on rider weight, terrain, and riding style. The GRIP damper on this model uses a sweep-style compression adjuster with a wide range of tuning that allows for quick changes on the trail.
Setting Air Pressure and Sag
Proper air spring pressure is fundamental to performance. Setting sag accurately allows the fork to use its full travel efficiently without bottoming out or topping out too frequently.
Start by setting your rider weight (including gear) as the baseline. Fox recommends 15-20% sag for most trail use.
- Deflate the fork completely before adding new air pressure.
- Use a shock pump to add air gradually. For a rider weight of 75 kg (165 lbs), start with 75 psi as a base.
- Sit on the bike in your regular riding position with no weight on the handlebars.
- Use a zip tie or o-ring to measure the travel used, then dismount carefully.
- Adjust pressure up or down in 5 psi increments until the fork compresses to the 15-20% mark (usually about 18-25 mm for a 150 mm fork).
Tuning Rebound Damping
Rebound adjustment on the Float 36 Rhythm eMTB controls how fast the fork extends after compression. Too fast, and the ride feels bouncy; too slow, and it becomes harsh and unresponsive.
- Turn the red rebound dial (bottom of the right leg) fully clockwise to close.
- Then, turn counterclockwise to open. Count the clicks.
- Start with 8–10 clicks out for general trail use.
- Heavier riders or aggressive descenders may need fewer clicks (slower rebound).
- Lighter riders or smoother trails may benefit from more clicks (faster rebound).
Check performance over multiple rides and fine-tune based on feedback. Use small, incremental adjustments for best results.
Adjusting Compression with the GRIP Damper
The GRIP damper’s compression knob on the top right of the fork leg features a sweep-style adjustment without distinct clicks. It controls how the fork resists compression from hits and rider input.
- Turn fully clockwise to firm the fork for climbing or fire roads.
- Turn counterclockwise to open the fork for descending or technical terrain.
- For general riding, start in the middle position and make minor adjustments during the ride.
This damper is known for its ease of use, especially on-the-fly tuning. Riders can adapt suspension feel mid-ride with minimal effort.
Maintaining the Fork for Long-Term Performance
Maintenance extends the fork’s lifespan and ensures consistent performance.
Lower Leg Service (Every 50 Hours)
- Remove the fork lowers using a 5mm hex key [paid link].
- Clean all components with isopropyl alcohol.
- Replace bath oil with 20cc of Fox Float Fluid per leg.
- Check and replace foam rings and dust wipers as needed.
- Reinstall lowers using a torque wrench [paid link] (5.1 Nm on lower bolts).
Air Spring Service (Every 125 Hours)
- Disassemble the air spring assembly.
- Clean and inspect all seals.
- Lubricate with suspension grease before reassembly.
- Check for wear or contamination, especially if the fork feels sticky or harsh.
Troubleshooting Common Issues
Excessive Fork Dive
- Increase air pressure slightly (5–10 psi).
- Add volume spacers to increase ramp-up and resist bottom-out.
Harsh Ride or Stiction
- Check lubrication level in lowers.
- Perform lower leg service if overdue.
- Reduce air pressure slightly to increase compliance.
Fork Not Returning Quickly
- Rebound may be set too slow—open up the rebound dial incrementally.
- Check for air in the damper or low bath oil levels.
Customization Options for Improved Performance
The Float 36 Rhythm is tunable via volume spacers to adjust spring progression. Stock setups often come with 1–2 spacers installed.
- For a more supportive feel on big hits, add volume spacers (up to 5 maximum).
- For a more linear feel or lighter rider, remove spacers.
- Each spacer change makes a noticeable difference—test on your regular trails for comparison.
Additionally, upgrading to aftermarket seals or using performance lubricants like Slickoleum can further enhance small bump sensitivity.
Compatibility with Other Drivetrain and Suspension Components
The Float 36 Rhythm eMTB fork features a standard 15×110 mm Boost axle and 1.5” tapered steerer. It pairs best with:
- 27.5″ or 29″ wheels depending on the specific model
- Front brakes using 180 mm to 203 mm rotors
- eMTB chassis designed for aggressive trail or enduro use
- Compatible with Fox’s and most third-party fenders
It does not include a high-speed compression adjuster, unlike higher-end Factory and Performance Elite models. However, it remains fully compatible with standard headsets, stems, and brake calipers.
Comparison with Similar Forks in the Fox Lineup
| Model | Adjustability | Damper Type | Price Tier | Best For |
|---|---|---|---|---|
| Float 36 Rhythm | Low-speed compression, rebound | GRIP | Entry-level OEM | General trail, eMTB riding |
| Float 36 Performance | Low-speed compression, rebound | GRIP2 | Mid-range | Aggressive trail/enduro |
| Float 36 Factory | High/low-speed compression, rebound | GRIP2 | Premium | Racing and expert-level tuning |
The Rhythm is the most user-friendly and budget-conscious model, ideal for eMTB riders seeking performance without deep tuning complexity.
FAQs
1. How often should I check the air pressure in my Float 36 Rhythm eMTB fork?
Air pressure should be checked every ride. Environmental factors like altitude and temperature can affect pressure readings.
2. Can I upgrade the GRIP damper to a GRIP2 in the Float 36 Rhythm?
Technically possible, but not cost-effective. The Rhythm chassis is optimized for the GRIP damper, and an upgrade may require damper-specific internals.
3. How do I know if my fork needs a service?
Signs include reduced travel, harshness, visible oil leakage, or sticky movement. Follow Fox’s 50- and 125-hour service intervals for best results.
4. What volume spacer configuration is best for enduro-style riding?
Using 2–3 volume spacers provides a good ramp-up feel for hard hits and aggressive descending.
5. Is the Float 36 Rhythm eMTB suitable for downhill use?
While capable, it’s not as robust as dual-crown forks or the Fox 38. Ideal for trail and enduro, not prolonged downhill racing.
6. Can I use this fork with a coil spring conversion kit?
No, the Rhythm model is designed solely for air spring use. Coil conversions are not supported and may void the warranty.
Conclusion
The Fox Float 36 Rhythm eMTB suspension fork delivers reliable and adaptable performance for a wide range of riders. With proper setup and regular maintenance, it offers a well-rounded and dependable ride feel. By following this guide to air pressure tuning, rebound control, and damper adjustment, you can unlock its full potential on the trail while ensuring long-term durability.