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Shockwave Parts
Fox Fork Full Rebuild Tool Kit – Lower Legs + Air Shaft
Fox Fork Full Rebuild Tool Kit – Lower Legs + Air Shaft
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$69.49 CAD
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Fox Forks Full Lower Leg + Air Shaft Rebuild
Full 50-hour service for Fox forks, includes dust wiper replacement and a complete 200 hours air shaft rebuild (positive + negative seals).
Apply SRAM Butter on the lower leg stanchion bushings, it makes a huge difference on the stick friction!
Use Air Spring Seal kits, they are so cheap and the shipping is free because he ships them in letters! You will have to get the real fox kit for the damper sadly, I did not find any aftermarket ones.⚠️ Important Safety Warning:
Always depressurize the air spring before removing your lowers. Air can remain in the negative chamber, fully deflate your air spring 15–20 psi at a time and pull on the lowers to equalize the chambers as you go. Do this before removing the wheel.
Always depressurize the air spring before removing your lowers. Air can remain in the negative chamber, fully deflate your air spring 15–20 psi at a time and pull on the lowers to equalize the chambers as you go. Do this before removing the wheel.
Special Note for Fox 38 NA2:
This fork uses a removable full airspring assembly. Please refer to this official Fox service manual for proper removal and reassembly.
This fork uses a removable full airspring assembly. Please refer to this official Fox service manual for proper removal and reassembly.
Note for Fox 40:
You’ll need a SPA-1 Pin Spanner (3mm pins) to remove the air piston. The SPA-2 may also work, but has 2.3mm pins. And the pin wrench are not included because they are not special/expensive tools to buy.
You’ll need a SPA-1 Pin Spanner (3mm pins) to remove the air piston. The SPA-2 may also work, but has 2.3mm pins. And the pin wrench are not included because they are not special/expensive tools to buy.
What You Need
- Fox 20wt Gold : for the air spring side (left leg)
- Fox 4wt Fluid : for the GRIP damper side (right leg)
- Slickoleum Grease (or SRAM Butter)
- 60ml+ syringe with tube (for oil volume, see Fox volume chart)
- Soft mallet or block of wood (to knock the shafts loose)
- 6-in-1 Top Cap Tool
- Dust Wiper Seal Press Tool (select the size that matches your fork, see below)
- 10mm Shaft Clamp : to hold the air shaft safely
- NA2 Bullet Tool : for reinstalling the negative seal head because there is a U-cup seal and the lip of the shaft is very sharp (plastic works, but metal is smoother). You can also get a metal version here: Frezon NA2 Bullet Tool Clone
- Heat source : torch, heat gun, or lighter to break Loctite
- Red Loctite for reinstallation of the air shaft tip
What’s Included:
- Your selected Dust Wiper Seal Press Tool
- Your selected Driver (for lower leg shafts)
- 10mm Shaft Clamp : to hold the air shaft safely
- Our Plastic Float NA2 Bullet Tool (for 10mm Fox air shafts)
Dust Wiper Tool + Finder
Use the same driver size as your fork number: Fox 36 = 36mm, etc. Try our auto-matching quiz:
Try the Dust Wiper FinderView the Dust Wiper Press Tool Product Page
Oil Notes:
- GRIP dampers ingest lower leg oil : always use 4wt on the damper side
- 20wt Gold on the air spring side only
- 20wt Gold on both sides for non-GRIP forks
- Soak your foam rings in oil before reinstalling
- Put 3ml of oil into the positive air chamber of the air piston
- GRIP dampers ingest lower leg oil : always use 4wt on the damper side
- 20wt Gold on the air spring side only
- 20wt Gold on both sides for non-GRIP forks
- Soak your foam rings in oil before reinstalling
- Put 3ml of oil into the positive air chamber of the air piston
Pro Tips:
- Insert dust wiper seals slowly and straight, don’t drive them too deep
- Use a seal press with a center guide to ensure perfect alignment
- Removing old wipers: 32mm wrench with rounded/taped tip works best. 24mm also works.
- Don't use anything sharp!
- Grease the Dust Wiper Seals inside and the lower leg bushings generously with SRAM Butter.
- Before reinstalling lowers, pressurize the air spring to 10–15 psi to avoid vacuum
- Clamp the air shaft close to the tip 1-2cm under, clean with alcohol, and use paper wrap
- After unscrewing the air shaft tip, slide out the negative seal head carefully
- Use the NA2 bullet tool to reinstall the seal head smoothly, grease it well and insert it pretty quickly, it might need quite some force if you didn't get the metal version but it worked for me multiple times and my fork didn't leak air in the lowers.
- Do not forget to use red Loctite when reinstalling the air shaft tip
Clamp Options
- 10mm Shaft Clamp (air shaft only)
- 8 + 10mm Combo Clamp (for air and damper shafts)
- How to Use Shaft Clamps on Small Shafts (Guide)
Disclaimer: This is a home mechanic guide. You are responsible for correct installation and safety. Always depressurize your fork completely before starting. See our Terms of Service.
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