• Adds speed-sensitive ending-stroke control and bottom-out force adjustability to compatible forks.
  • Just 55 g! Lighter than most air-spring assemblies with more than two tokens.
  • Isolate and tune bottom-out with minimal changes to initial and mid-stroke.
  • Bring your tuning to the trail and out of the workshop!
  • Easy installation requires little time and few tools - no lower-leg removal required (except for Fox 36 Version E).


Fox 32, Model C

     ...will fit 2016 and newer Fox 32 Float forks with the FIT 4 and Grip dampers. Recommended for 100-130mm 26”, 27.5” and 29" forks.


  • Not recommended for 80-90mm forks
  • Not compatible with 140-150mm forks
  • Not compatible with Fox 32mm Step Cast forks

Fox 34, Model A

    ...will fit 2016 - 2021 Fox 34 Float forks. Recommended for 140-160mm 29”, 27.5+, and 27.5” forks.
    ...will fit 2020 Marzocchi Z2. Recommended for 140-160mm 29”, 27.5+, and 27.5” forks.

    ...NEW will fit 2022 Fox 34 Float forks. Recommended for 130-140mm 29” forks.

    ...will fit 2019 and newer Fox 34 Step Cast Float forks. Recommended for 110-120mm 29” forks.

Fox 34, Model B (long-body)

    ...will fit 2016 - 2021 Fox 34 Float forks. Recommended for 110-130mm 29”, 27.5+, and 27.5” forks. NOT FOR FOX STEPCAST MODELS.


  • Maximum high-speed ending-stroke effect roughly equal to 4.5 standard Fox volume spacers.
  • Cartridges are incompatible with TALAS forks.
  • You can check the model year and make of your Fox fork here.

Fox 36 2015-2017, Model D

This new model goes beyond our previous offerings and includes parts to convert the stock air-spring into an independent positive and negative chamber arrangement similar to the Fulfill™ spring found in our Ribbon and 2017 Stage forks. Once installed, you can now vary the pressures in your two chambers; increasing your negative spring rate to improve small bump sensitivity (a common complaint with the stock spring). This, in addition to the control you have over bottom-out and ending-stroke performance, gives you a radically more sophisticated air-spring that’s incredibly straightforward to tune and adjust!

    ...will fit 2015-2017 Fox 36 Float forks. Recommended for 140-180mm 29”, 27.5+, and 27.5” forks.

Fox 36 2018-2022, Model F

Version F is a cartridge-only kit suitable for Fox 36 forks of all travel and wheelsize options. A revised air-spring design in the 2018 and later Fox 36 makes the Fulfill™ spring conversion included in Ramp Control Upgrade Version D incompatible.

    ...will fit 2018-2022 Fox 36 Float forks. Recommended for 140-180mm 29”, 27.5+, and 27.5” forks.
    ...will fit 2019-2022 Marzocchi Z1 (air only), all travel options.

Interested in the Ramp Control PRO for Fox 36? Click here.

Fox 38, Model G

  ...will fit 2021 and newer Fox 38 Factory and Performance forks.

Total tuning range (strictly in terms of ending-stroke support) is roughly equivalent to 1-4 volume spacers. Thus fully open, the Ramp Control cartridge reduces spring volume similar to one volume spacer. In its strongest setting, and under a high-speed compression, the ending-stroke support will be similar to a spring with its volume reduced by four standard spacers.

Fox 40, Model E

  ...will fit 2016 and newer Fox 40 Float Factory and Performance Elite forks.


Production Estimate: 1-2 days

Sold out


Inarguably, convenience is one of the biggest benefits of the Ramp Control cartridge versus internally-accessed volume adjustment components. Internally-accessed spacers aren’t friendly to on-trail experimentation and tuning - requiring bulky tools and a clean environment to utilize. With Ramp Control, experimentation is so simple it’s encouraged! The powerful range of Ramp Control is harnessed through a simple 16-position knob with clearly defined detents. That enables you to arrive at your base setting in just one ride on a familiar trail, whereas internally-accessed spacers would necessitate a trial and error approach - several rides followed by garage or shop sessions - to get to the same point.

The volume adjustment spacers used by competing brands change the shape of the air-spring’s curve throughout the entire travel range, regardless of velocity. Aside from the slight change resulting from the volume of the cartridge itself, the Ramp Control upgrade effects only the ending stoke spring curve - as its damping effect is velocity-dependent. This portion of the curve represents intense, sharp hits and big events, like landing a sizable drop or plowing through a rock garden. Without Ramp Control, your fork’s behavior in these circumstances has been compromised by your desired feel elsewhere in the stroke. With Ramp Control, you can tune the general feel of your fork through its air-pressure and damper settings, and isolate big-hit performance and bottom-out with the Ramp Control adjustment.

Unless you ride just one trail, the air-spring volume you’ve so carefully tuned with internally-accessed volume spacers is probably not ideal for all your adventures. A trip to the bike park might reveal, for example, that more support would be welcomed when the features and drops get bigger and trails get steeper than those found on your local go-to. If you have extra spacers and the necessary tools on hand, and don’t mind burning time that could otherwise be spent riding the lift-accessed terrain you just paid for, you could get the needed support. Or, in just seconds, you could add more Ramp Control and keep the good times going. Whether it’s a new-school flow trail or near vertical DH course, Ramp Control gives you immediate control of the terrain at hand - of particular benefit to time-crunched enduro fans tasked with practicing and racing multiple, varying stages.

Any and all trademarks herein are property of their respective owners. Any and all trademarks found within this website are used for compatibility information purposes only. Such use of trademarks do not constitute or imply an endorsement by the trademark holder, all compatibility and fit determinations have been made solely by MRP. Use of this or any other aftermarket product may void any warranty you have with the original part manufacturer.