RockShox SID RCT3 - Dual Air 100mm 29-Inch 9mm (White) Motion Control DNA damping mechanism is lighter than its predecessors while still offering smoother, more consistent damping performance 100mm of Dual Air travel, featuring adjustable positive and negative air spring chambers for easy and nuanced suspension tuning 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 1598g with tapered aluminum steerer. QR Motion Control DNA 3-Position Crown Adjuster Tapered Aluminum Steerer Disc