MRP has been using Ramp Control tech in its forks for a while to allow users to adjust the air spring volume, and therefore the progressivity of the stroke, on the fly. Now it’s available in a cartridge that fits inside any fixed travel, 35mm stanchion RockShox fork (Lyrik, Yari, Boxxer or Pike) and the Fox 32.
Rather than a solid piston, the system uses a variable-valve orifice to control air bleed speed into a secondary air chamber, depending on how far you twist the top-cap dial.
The cartridge takes up a similar space to one-and-a-half RockShox volume spacers, so if you’re running a single ‘Bottomless Token’ or none at all, give it a miss. If you’ve room, though, it provides subtle to very significant changes of shaft-speed-sensitive spring rate change, in the later-mid and final stroke, from the fork top.
I found it didn’t have any effect on slow/low-speed compression sensitivity, like using multiple solid tokens potentially can. This makes tuning far faster, more convenient and subtle than using a bag of volume spacers.
But at 10 times the price of enough tokens to tune most forks twice over, be sure to fully tighten the Ramp Control cartridge to avoid slow pressure leaks.