The Bomber Z1 Coil fork shares the same 36mm chassis and grip shock as the modern Bomber Z1, but combined with the most advanced coil spring system Marzocchi has ever made. Ultra-lightweight tempered steel spring (medium spring included) Noise management system for near-silent performance. Integrated air assist for progressiveness and bottom control. External preload adjuster for dialing. sagging and firmness out of the top. Travel can be easily changed in 10mm increments from 150 to 180mm (depending on wheel size) via included reconfigurable internal spacers. Additional springs are sold separately to tune and adjust to driver preference. Item Specifications: Axle to Crown Length, 580 Brake Type, 180 Color Post Mount, Black Black Crown, 40 External Settings, Rebound Damping Front Axle 15mm Thru x 110mm Lock Switch. Maximum tire width: 66 negative springs. Stem clamp diameter: 28.6 Strut diameter: 36 Head tube length (mm)263 Headset type: Tapered travel (mm)170 Wheel size29 inches