RockShox 30 Gold TK Tapered Steerer Crown Adjust Solo 120mm Air Fork, Black, 27.5-Inch With Solo Air you add air to your forks through a single Schrader valve, filling both the positive and negative air spring chambers simultaneously Weight: 26" - 1660g (3.66 lb.); 27.5" - 1842g (4.06 lb.); 29" - 1828g (4.03 lb.), based on 265mm 1-1/8" aluminum steerer, 9mm QR lower leg, Solo Air Turnkey crown mounted lockout features a patented blow off design to take the edge off unexpected hits even when the lockout is engaged Features printed Air Guides on fork legs Maybe not a technological feat, but it will help you set up your suspension in seconds instead of minutes