TTX1 refers to a single air chamber for less air volume. Offers a more progressive spring rate TTX Twin tube design for consistent damping performance on all types of terrain Extra bushing overlap for improved side load management Specific wiper seal and air sleeve lubrication reduce friction External rebound, lowspeed and high-speed compression adjustment Climb mode to reduce suspension movements during climbs Includes (2) air spring volume spacers Mounting hardware sold separately (spherical bearings reduce friction on the shock during side loads for improved small bump sensitivity, optional on widths up to 22mm)