MX Has grips that are held in place with wire, it works better and is more durable and reliable than a lock on grip. Break the lock on part, and your grip comes off, but break the wire and your grip stays on because its got 2 more left, and its usually stuck on the bar with glue. Air suspension is a hard topic for MX bikes... Harder impacts mean higher pressures, which mean higher risk and thicker sealscartridge casings. All that makes for extra weight, and that would make it pretty close to the same weight as a oil fork. So there isnt really a point in going through all the effort. The rear suspension on most high end bikes works with nitrogen though...
