Fox 36 Open Bath Cartridge and Adaptor Kit




The best performance modification you will ever do to your fork!

Complete replacement of the damper with our open bath cartridge!

This will make your fork feel like a completely different fork, because it is!

Low speed damping that’s firm but still blows-off to be plush on small bumps,
Reduced fork dive that eases the fork through the travel without harshness,
No more high speed compression spikes and no more bottoming with the optional ABS system.
Low speed compression and rebound adjusters help fine tune the valving as to how it transitions from low to mid and when the high speed kicks in,
Much more effective than the other dampers attempt to add high speed adjustment without the proper shim stack.

Open Bath Cartridge system for better lubrication, smoother action and virtually maintenance free.

External low speed compression and low speed rebound adjusters
(uses stock Fox 36 rebound Fork Cap).

Internal revalvable custom high speed compression and rebound valving.

Internal Anti-dive MidValving.

Optional ABS when using coil conversion kits and when air progression is not enough to prevent bottoming

Optional FvAT/HSB System

Includes the 20 mm Cartridge Damper Kit Insert and fork cap adaptor.

Self install kit, user serviceable and revalvable.

All cartridges are optimized for current travel.
If you plan on changing the travel in the future, please let us know so the proper cartridge tube can be installed.

Talas travel positions are still functional as only the damper side is modified.
It will work in all travel modes, the tune can be set for a best compromise between
the two or we can set it up for the higher travel mode, because this is the more sensitive position generally used for DH. When set to the reduced travel mode we suggest that you stiffen the suspension up with the clickers, same as you did with the stock damper.

For details on Cartridge click here:

To order tools, revalving kits, and replacement adaptors click here:

Weight grams 238 grams plus oil.
(Fox Fit RC2 Cartridge - 266 grams filled with oil).

2015-18 RC2/Fit 4/Grip Models
Use our new Flush fork cap and adaptor


Fits all Fox 36 2005-2014 Float, Talas, Van models with rebound adjuster on top of fork. If your fork is a newer model with a compression fork cap you will need to order the rebound cap from Fox as shown below:

Your Fork must have this kind of fork cap for your fork to fit our cartridge.
You can order it from Fox parts system:

We have a small supply of Fox fork caps here if you need to get them from us
Call for pricing and availability.

For 2011-14 forks measure you fork cap threads
for 33.3 mm or 33.8 mm use part number below:

820-05-074-KIT 2011-14 170/180mm approx (33.3 mm x.80 x 7)
820-05-093-KIT 2011-14 160mm approx (33.8 mm x.80 x 7).


We include an adaptor for our cartridge to use the stock Fox rebound cap. (shown as the silver aluminum hex)




• Replacement open bath maintenance free speed sensitive damper assembly, "set it and forget it"
• 20 mm ID damper tube with shimmed 4 port MX style compression and rebound valving pistons
• Upper fork cap adjuster screw with 22 clicks of activated low speed rebound
• Base valve adjuster screw with 22 clicks of activated low speed compression adjustment
• Optional Hydraulic Anti-Bottoming System (ABS) for end of stroke bottoming resistance
• Speed sensitive multi-stage shimmed compression, midvalves and rebound valving
• Custom valved and set-up for each rider with printed set-up charts
• Fork spring and air pressure recommendations help us tune to to your weight riding style
Midvalve kit included with standard cartridge to prevent fork dive, adds low speed compression without
harshness, optional midvalve revalving shim kit and set-up charts available
• Designed to be self-installed or send it to us for installation if you need us to do the install

• Weight approx. 300 grams

Need us to install it for you, just send your fork to us and we will install it for $100 including Spectro 85/150 oil.

*Self install kit assumes good working knowledge of internals and service procedures.

• Optional FvAT/HSB
Floating Valving Assisted Threshold High Speed Blow-off System

click here to add it to your cartridge

For the firmer feel without harshness, have that big hit set-up that still feels plush on square edged bumps!

Available for those who want to fiddle with their set-up:
Optional revalving kit for compression and rebound pistons, with revalving set-up charts



Fox 36 open Bath Cartridge disassembled



2015 Fox 36 with optional ABS and optional FvAT/HSB installed


Cartridge Cut-away View


Compression, Rebound and Midvalve shown above.



Purchase Here

Fox 36 Open Bath Cartridge Kit including fork Cap Adaptor
and Midvalves installed, $449

New Flush Fox 36 Adjuster Cap and Adaptor

Download: Fox 36 Cartridge Installation and Set-up Manual Rev A(19 MB)

Custom valved and set-up to rider weight, ability and riding style

Need to have us install it for you? Ship your fork to us and we can install it for $100 plus shipping, includes Spectro 85/150 oil.

Push ACS3 coil conversion kits
Push ACS3 coil conversion kits are compatible with our cartridge.
In order to make the overall spring rate as linear as possible we recommend the minimum or no ramp pressure.
Choose the spring for your weight that gives you 22% sag with 5-8 mm of preload.
We prefer to control bottoming with the use of our optional ABS on the damper side.
This will create a more linear spring system without any mid to end stroke ramp-up and will improve deep square edged hits and better control on jump faces.

The reason you are buying the coil system is to improve the feel of the air spring system and eliminate some of the maintenance issues. The coil will reduce the stiction and smooth out the drag in the beginning of the travel. With the stock damper the compression is too harsh and has to be setup very soft to feel acceptable, since you are converting to coil the tokens will not be able to be used to stop bottoming, Push has designed an end of stroke(last 1/3) to add this progression back into the spring system to allow the rider to create ramp-up to assist the linear coil system from bottoming. This air system is adjustable and is essentially not needed or will be set to 0 psi with proper damping system that we are producing, we are trying to make the fork feel as linear as possible with either the air system, ie no extra tokens needed or with a coil system no air assist system needed. As with all Motocross bikes and most of the early MTB coil forks they used larger amounts of oil in the fork spring side and this height of the fork oil could be varied to create progression. As forks were made lighter this oil was eliminated from the coil leg to save weight and the damper side created all the progression needed or the damper side provided a hydraulic anti-bottoming system, as with our open bath damper design can do. Remember long before air forks were designed to work well, coil forks ruled the planet and we originally designed our cartridge for these coil systems, nothing new here!

mtbr member
( Was thinking of getting the acs3 Ive already got lyrik with avy cartridge, just wanna know how ppl are gettin on with the same combo, is it hat much better ?)
"I've posted this already but will again. I have a 2017 Fox 36 with both and it's fantastic. A "TRUE" set it and forget it setup. Some say it's not designed for the Avy as it's a open bath damper. Yes, that's true... the Air bump stop part of it anyway. The rest... a fantastic coil system that works perfectly with the Avy Damper. I just run 0 psi in the ACS-3's air bump stop as I have the ABS option on my Avy. I've tried it with air in the ACS-3's bump stop with the Avy's ABS option removed and it still works awesome as well but I prefer to not have to deal with air pressure at all. I'd get both again in a heart beat."

Push ACS-3 Coil Conversion kit

Choose the type of riding that you will be doing so we can custom valve it to your specific needs.

Click here for a description of our definitions

Type of Riding

Choose your fork year that the cartridge will be installed in.

Fork Year

Choose your fork model that the cartridge will be installed in.

Fork Model

Choose your fork travel (mm) that the cartridge will be installed in.
For Talas forks choose the travel you want the set-up optimized for.

Fork Travel

Choose your fork wheel size that the cartridge will be installed in.

Fork Wheel size

Choose rider weight.
Rider weight is without gear, we add 5-7 lbs for DH gear, 7-10 lbs for All-Mtn/Freeride.

Rider Weight

Choose the spring rate/air pressure you will be using which gives you 22% sag.
We need this number to help set-up your fork rebound damping correctly.

Click here for sag setting Tips


Air Pressure
or Spring Rate

Choose your rider ability for us to set-up the cartridge.

Rider Ability







Fox 36 Rebound Adjuster Cap

Fox 36 2011-14 Fork

Oem Rebound Adjuster Fork Caps

Required for inverted FIT damper replacement, i.e. forks with compression on top.

For 2011-14 forks measure you fork cap threads
for 34 mm or 33 mm use part number below:

820-05-093-KIT 2011-14 160mm (33.8 mm x.80 x 7)
820-05-074-KIT 2011-14 170/180mm(33.3 mm x.80 x 7)

For 2015/16 use the stock fork cap with our cartridge

Price $42

Available Now


Rebound Adjuster Cap

Price $42








ABS Option

Click here for more details

Push ACS3 coil conversion kits
Push ACS3 coil conversion kits are compatible with our cartridge.
In order to make the overall spring rate as linear as possible we recommend the minimum or no ramp pressure.
We recommend that you may need to purchase the next stiffer spring for your weight because no addition spring rate will be generated by the ramp up system.
We prefer to control bottoming with the use of our optional ABS on the damper side.
This will create a more linear spring system without any mid to end stroke ramp-up and will improve deep square edged hits and better control on jump faces.

Add option here

Price $89.95

Price $89.95, during initial build.

Price $89.95, plus labor($89) to retro fit, send your cartridge to us for installation.






Have us install your cartridge for you

Ship us your fork, we will install your new cartridge,
service and rebuild your air spring with our improved air transfer sealing system, 2015-2017 Models
replace seals and relube.
includes Spectro 85/150 Oil

Add option here, does not include shipping back to you, we will adjust your shipping total depending on where you live in the world and send you a Paypal invoice for the difference. Iit assumes your fork is in good working condition with no physical damage or scratches on the stanchions.

Add each item required to the cart. Price $99


Installation and Service

Price $100, plus shipping difference






The Avalanche Advantage over the the Fit RC2 cartridge:


A larger (20mm vs 15.5mm) 4 port rebound valve that has more low to midspeed transition control and optional high speed shim configurations for different spring rates and rider conditions.

A midvalve with user tunable shims/valving that provides anti-dive feature while still blowing off without low speed harshness on small bumps.

The same DHF proven design (20 mm) 4 port compression valve with optional revalving charts and shims available to fine tune your fork for your individual riding conditions and ability.

User serviceable, all parts are available here at Avalanche to service or modify the internal set-up.

Revalving kits can be purchased from Avalanche or any suspension tuning shop that carries standard 6 mm shims.

High speed adjustment is at best a compromise of the original shim stack, depending on the high speed spring preload adjuster rate and where the pressure is applied

on the shim stacks you can get less than desirable results in damping feel, i.e. preloading the outside rim of the shim may make the high speed stiffer,

but also creates mid and low speed harshness in the damper.

The original RC/RC2 large compression adjuster protrusion at the bottom of the fork is eliminated and cleanly redesigned.