Since downhill riders aren't typically concerned with weight, not a popular downhill frame material. The tubes that connect the rear dropouts to the bottom bracket. A steel alloy that contains chromium and molybdenum. A super strong frame material that's easy to work with, but heavy. This allows the rider to push down AND pull up on the pedals.
Riders release from clipless pedals by rotating their heel to the side.
A method of computer-controlled machining that can quickly produce intricately machined parts and components. This allows small parts manufacturers to produce unique products at relatively low cost. A great boon for downhilling. What happens when the shock absorbs impact. Controlling the speed that a shock rebounds.