RockShox SID RCT3 - Solo Air 100 mm, (Maxle Lite 15, Tapered Steerer, (29 - Inch), Crown Adjust, Black) Motion Control DNA damping mechanism is lighter than its predecessors while still offering smoother, more consistent damping performance 100mm of Solo Air travel uses a single Schrader air valve to simultaneously fill both positive and negative air chambers, simplifying suspension setup and retaining the lightweight and plush ride of Dual Air Damping adjustment - External rebound, low speed compression, 3 position compression (open/platform/lock) RCT3 - Three position crown mounted switch offers additional adjustment capability and improved damping performance 1685g w/ Maxle lite 15 and tapered aluminum steerer