![]() The ti or plastic compression tubes will compress slightly even when the fork is locked, allowing several millimeters of travel. Well, in the real world, the fork should still move slightly to allow it to track well. When you have the fork locked out, that essentially means the compression oil ports are closed, so no oil can flow and the fork can’t move. The other feature that’s built into the the Motion Control assembly is Floodgate, which is what sets the blowoff threshhold when the fork is locked out. And that’s where that technically named piece called “the poker” comes into play. That, and a titanium compression tube versus a thermoplastic one. These tubes are what control the lockout blowoff in conjunction with the Floodgate: So, the big difference between BBMC and MC is the secondary compression damping via the shim stack. During slow speed compression the oil simply flows around the shim stack…it only comes into play on large hits. The multiple ports let the oil flow through the shim stack evenly rather then coming at it all from one side. Why? Because there is a small shim stack behind the ports to control high speed compression damping (for when you drop off something or hit something really hard). Shown on the right, this means you get a slightly differently shaped valve cover (the bronze piece) that lets oil flow through multiple ports. With Blackbox Motion Control, you get Dual Flow compression damping. ![]() The more you close it, the more restricted the oil flow is and the slower your compression damping becomes. So, when you turn the blue compression knob at the top of the right fork leg, you’re changing the size of the oil flow port. ![]() They’re fuzzy because we used a very linty rag to wipe the oil off before we photographed them, they don’t look like that normally. Shown directly above is Motion Control’s compression damping port fully open (left) and closed (right). Unlike many other suspension forks, Rockshox’s Motion Control mostly eschews shim stacks in favor of simple ports. Jump past the break to see how they work to control the compression… Again, this is explained better in a sec. Technically, you also have XX Motion Control, but it is essentially the same as Motion Control without the adjustable compression damping. Motion Control DH is a little different and we didn’t take a look at that on this visit (update will come if we can get photos of that system, but I’ll explain how and why these versions are mainly for XC use versus DH).įor XC / Trail / All Mountain type riding, you have two options depending on how much you wanna spend on your fork: Motion Control and Blackbox Motion Control. The parts above are what make up the Motion Control for their XC oriented forks. If you recall, we posted a tech article on how Fox Racing Shox’s Terralogic works recently, and it’s really cool to see how different companies use completely different mechanisms to accomplish a similar end result (and by similar, I’m not comparing performance, just the fact that all suspension brands want damping, etc.). I took a little tour of Rockshox’s Colorado Springs, CO, facility yesterday and had Sander Rigney, RS’s product manager, run through their Motion Control compression damping system for me.
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