The Fox Float 40 Factory eMTB suspension fork is designed for aggressive electric mountain biking, offering high-end performance, stiffness, and adjustability for riders pushing their limits on technical terrain. This guide provides an in-depth comparison between the Float 40 Factory and other top-tier suspension forks, highlighting its standout features, setup advantages, compatibility considerations, and performance benchmarks.
Technical Overview of the Float 40 Factory eMTB
The Float 40 Factory eMTB is engineered for downhill and enduro riders who demand precise damping control and superior ride quality. Built with a 40mm chassis and boasting the GRIP2 damper, this fork is tailored for high-force, high-speed eMTB applications.
Key specifications include:
- 40mm stanchions for maximum stiffness.
- GRIP2 damper with Variable Valve Control (VVC) for precise compression and rebound tuning.
- Float EVOL air spring for improved small bump sensitivity and mid-stroke support.
- Kashima Coat for reduced friction and long-term durability.
- 203mm maximum rotor compatibility.
- E-MTB specific crown for enhanced strength under load.
Installation, Setup, and Initial Adjustment
Installation of the Float 40 Factory eMTB is straightforward for experienced mechanics familiar with double-crown forks. However, precision is crucial due to its high-performance intent.
- Ensure the fork is compatible with your frame’s headtube diameter and axle spacing.
- Torque settings on the pinch bolts and axle must be meticulously followed to avoid creaking or unwanted flex.
- Install with the proper steerer tube length and align the crowns carefully to prevent binding.
During setup:
- Inflate the EVOL air spring to match rider weight and sag preferences, generally targeting 20-25% sag.
- Set the low-speed and high-speed compression, as well as rebound, using the external GRIP2 adjusters.
- Use the Factory’s tuning guide as a baseline and fine-tune on the trail based on brake dive, bottom-out behavior, and traction feedback.
Performance Comparison with RockShox Boxxer Ultimate
The primary rival to the Float 40 Factory eMTB is the RockShox Boxxer Ultimate, which also targets the elite DH and eMTB segments.
The Float 40 Factory provides superior small bump sensitivity due to its EVOL air spring and Kashima coating. Meanwhile, the Boxxer Ultimate, equipped with the Charger 2.1 damper, offers excellent mid-stroke support but feels less supple at the start of the stroke.
In terms of adjustability:
- The GRIP2 damper provides more granular control compared to the Boxxer’s Charger 2.1, particularly in high-speed damping.
- The Boxxer features slightly lighter weight and a more linear spring curve, appealing to some riders focused on park or jump trails.
However, in aggressive terrain and sustained descents, the Float 40 excels in composure and heat management due to its larger stanchions and high-oil volume architecture.
Comparison with Öhlins DH38 m.1
The Öhlins DH38 m.1 is another direct competitor known for plush ride characteristics and Swedish engineering precision.
When comparing damping characteristics, the Float 40 Factory offers more external tuning flexibility. The Öhlins fork feels extremely controlled at high speeds but requires internal tuning changes for nuanced adjustment, which may not suit all riders.
The DH38 is heavier than the Float 40, primarily due to its coil spring options, which may benefit riders seeking consistent performance in cold climates or long enduro races.
Customization and Ride Optimization
The Float 40 Factory offers multiple tuning options:
- Volume spacers in the EVOL air spring allow customization of the spring curve.
- High-speed compression and rebound damping settings allow adaptation to rider style and terrain.
- Crown spacers and stanchion height tuning impact ride height and head angle adjustment.
For riders seeking increased progressivity or reduced fork dive, adding tokens and increasing low-speed compression damping can help optimize feel without sacrificing comfort.
Troubleshooting Common Setup Issues
Misalignments or improper torque during installation can lead to binding or stiction. If small bump compliance feels poor, check for bushing friction or excess air spring pressure.
Other common issues include:
- Inconsistent damping: often due to improper GRIP2 tuning—reset to factory and retune incrementally.
- Brake dive: may be mitigated through added compression damping or volume spacers.
- Noise or creaks: ensure pinch bolts and steerer interface are properly torqued and greased.
Compatibility with eMTB Frames and Drivetrains
The Float 40 Factory is compatible with most modern downhill and enduro eMTB frames designed for dual-crown forks. It supports boost axle spacing (20x110mm) and is designed for use with 27.5” and 29” wheels, depending on model.
Ensure:
- Your frame’s headtube supports the dual-crown setup.
- Brakes are compatible with 203mm+ rotors and the fork’s post-mount caliper setup.
- The fork’s axle fits the chosen wheelset, ideally with boost spacing for maximum stiffness.
Cost and Value Analysis
Though priced at a premium, the Float 40 Factory offers a strong value proposition for serious eMTB riders due to its longevity, tunability, and high-performance attributes.
Compared to the RockShox Boxxer Ultimate and Öhlins DH38 m.1, it sits in a similar price range but offers greater external adjustability and a more refined, tunable damping feel out of the box.
Conclusion
The Fox Float 40 Factory eMTB is a premier suspension fork purpose-built for electric mountain biking at the highest levels. When compared to other elite forks like the RockShox Boxxer Ultimate and Öhlins DH38 m.1, it stands out due to its superior adjustability, stiffness, and small bump compliance. Riders seeking a race-proven, tunable, and robust fork for aggressive trail riding or downhill racing on eMTBs will find the Float 40 Factory a top-tier choice.
Frequently Asked Questions
1. Is the Float 40 Factory suitable for non-electric mountain bikes?
Yes, it can be used on standard downhill bikes if the frame is compatible with a dual-crown fork, though it is optimized for eMTB use.
2. How often does the Float 40 Factory need servicing?
Lower leg service is recommended every 40 hours of riding, while a full damper and air spring service should be done every 100-125 hours.
3. Can I use a 200mm rotor with this fork?
Yes, it is compatible with rotors 200mm and larger, but 203mm is the standard for optimal performance.
4. Does the fork come with a fender?
Fox offers an optional bolt-on fender for the Float 40 Factory, but it is not included with all models.
5. How much travel does the Float 40 Factory offer?
It provides 203mm of travel, ideal for downhill and enduro eMTB applications.
6. What is the weight of the Float 40 Factory?
It weighs approximately 2,820 grams (6.2 lbs), making it competitive among dual-crown eMTB forks.