The Fox 34 Float Factory GRIP2 fork is a high-performance suspension component known for its precise damping control, robust construction, and adjustability. Regular maintenance, including a full rebuild, ensures consistent performance and extends the service life of internal components. This guide covers the complete rebuild process for the 34 Float Factory GRIP2 fork, with a focus on technical precision, correct setup, and optimal performance tuning.
Tools Required
- 10mm, 15mm, and 32mm sockets
- 6mm and 2mm hex wrenches
- Torque wrench [paid link] (inch-pounds)
- Seal driver specific for Fox 34
- Pick set
- Suspension grease (e.g., Slickoleum)
- Isopropyl alcohol and lint-free wipes
- Suspension oil (Fox 20wt Gold and 5wt Teflon-infused)
- Oil syringe or graduated measuring cup
- Rubber mallet
- Clean work stand
Removing the Fork from the Bike
Before beginning the rebuild, remove the fork from the bike to gain full access to the lowers, damper, and air spring assemblies. Disconnect the front brake caliper and brake hose from the fork leg. Remove the front wheel, axle, and headset spacers. Carefully unthread the top cap and slide the fork out of the head tube, supporting its weight to avoid damage.
Draining the Fork Oil
Set the fork upright in a stand. Use a 10mm socket to loosen the air side bottom nut and a 15mm socket for the damper side. Once loosened, tap each gently with a rubber mallet to release the internal shafts from the lowers. Allow the oil to fully drain into a catch pan. This step is critical to prevent contamination and ensure accurate reassembly.
Removing the Lower Legs
After draining, remove the bottom nuts completely and slide the lower legs off the upper stanchions. Inspect the inside of the lowers for oil contamination, debris, or wear. Use isopropyl alcohol and lint-free wipes to clean the inside surfaces thoroughly. Carefully remove the dust wipers and foam rings using a pick.
Rebuilding the Air Spring
Use a 32mm socket to unthread the air top cap. Depressurize the air spring fully before disassembly. Slide the air shaft out and inspect the internal seals. Remove and replace the air piston seal, glide rings, and dynamic O-rings. Lightly coat each new seal with suspension grease before reinstallation. Reinsert the air shaft, torque the top cap to manufacturer specifications, and recheck for smooth movement.
Servicing the GRIP2 Damper
The GRIP2 damper is not user-serviceable beyond oil replacement and external adjustment cleaning. If damping performance feels compromised, a professional damper rebuild may be required. However, replacing the bath oil and cleaning the damper side lowers can restore function. Flush the damper side with 5wt oil, cycle the damper rod, and ensure clean rebound and compression shafts.
Replacing Dust Wipers and Foam Rings
Install new foam rings in the lower legs, pre-soaked in 20wt Gold oil. Press new dust wipers using the appropriate Fox 34 seal driver to avoid damaging the stanchion interfaces. Ensure even seating and alignment. These components are critical for keeping contaminants out and maintaining lubrication.
Reinstalling the Lower Legs
Slide the lower legs back onto the upper stanchions slowly, ensuring the damper and air shafts align properly with their respective bushings. Add 10cc of 20wt Gold oil to each lower leg through the shaft openings. Gently tap the lowers upward and thread the bottom nuts by hand. Torque them to Fox’s specified values.
Air Spring Pressurization and Final Setup
Once assembled, reinflate the air spring to your preferred sag setting using a high-pressure shock pump. Confirm sag, compression, and rebound settings. Cycle the fork several times to distribute oil and eliminate any trapped air. Check for smooth travel and absence of noise or harshness.
Troubleshooting Common Setup Issues
If the fork feels sticky or slow to rebound post-rebuild, verify proper oil volumes and ensure seals are correctly oriented. A harsh top-out clunk may indicate incorrect damper rod installation. If compression damping is unresponsive, double-check the GRIP2 adjusters and ensure the internal cartridge has not been compromised during the process.
Customization and Tuning
The GRIP2 damper provides four external adjustments: high- and low-speed compression and rebound. Riders can fine-tune these settings based on terrain and rider weight. Use small incremental changes and test ride adjustments. For additional performance, consider installing volume spacers to modify the air spring curve, particularly for aggressive or enduro riding styles.
Compatibility with Drivetrain and Frame Standards
The Fox 34 Float Factory GRIP2 is designed for modern trail and all-mountain applications. It features a Boost 110mm axle spacing and is compatible with tapered head tubes and 29-inch wheels. Ensure your headset and frame support a 44mm or 56mm lower cup. Its 51mm rake is optimized for stability and responsive steering with modern trail geometries.
Model Comparison: 34 Float Factory GRIP2 vs. Performance Elite
The Factory GRIP2 and Performance Elite GRIP2 share internals, but differ in external finish and weight. The Factory includes Kashima-coated stanchions for reduced friction and improved durability. If budget is a constraint, the Performance Elite offers identical performance with a black anodized finish at a lower cost. Riders prioritizing aesthetics and long-term wear should opt for the Factory version.
Longevity and Maintenance Schedule
Fox recommends a lower leg service every 50 hours of riding and a full air spring and damper service every 125 hours. Regular inspection for stanchion wear, seal condition, and damping performance ensures long-term reliability. Log service intervals and maintain a clean exterior to reduce wear and improve longevity.
Frequently Asked Questions (FAQs)
How often should I rebuild my 34 Float Factory GRIP2 fork?
Fox advises a full rebuild every 125 hours of ride time or annually, whichever comes first.
Can I upgrade a Performance Elite GRIP2 to a Factory model?
Only the external finish differs. Internal upgrades are not required; however, changing stanchions requires purchasing new CSU parts.
What torque settings are needed during reassembly?
Refer to Fox’s technical manual: 50 in-lb for bottom nuts and 220 in-lb for top caps.
How do I know if my GRIP2 damper needs professional service?
If external adjustments stop affecting performance or oil leaks are visible, a full factory service is recommended.
Can I use different suspension oils than Fox 20wt Gold?
Use only Fox-specified oils to preserve seal integrity and damping consistency.
Is it possible to install volume spacers myself?
Yes. Volume spacers can be added or removed via the air spring top cap with basic tools and Fox’s guide.
Conclusion
Rebuilding your 34 Float Factory GRIP2 fork restores its factory performance and prolongs its lifespan. Attention to detail during each step ensures reliability, optimal ride quality, and confidence on the trail. Regular maintenance aligned with Fox’s guidelines enhances performance and protects your investment in high-end suspension technology.