<!--ProdInc[300299279]/Mall:[backcountry_US]-->Coming from RockShox''s SID family, the SID Ultimate 29inch Boost Fork is the top-level option for aggressive XC riding. It perfectly balances our go-fast tendencies with our desire to chase after trails with bigger hits and features. Stiffness is boosted over the featherweight SID SL thanks to a larger 35mm chassis, supported internally by RockShox''s Charger Race Day Damper. Ultra-low friction SKF wiper seals offer lasting performance and an overall suspension feel, and its DebonAir spring employs a higher ride height for improved handling and confidence. <h3>Details</h3> RockShox''s stiff, speedy fork for XC riding and racing 35mm chassis is lightweight, but more rigid than SD SL Charger Race Day Damper boosts traction and bump-absorption DebonAir air spring maintains rider height for confidence and control Ultra-low friction SKF wiper seals improve lifespan and suspension feel Item #RSXB04Y <h3>Tech Specs</h3> Travel : 120mm Stanchion Material : Fast Black-coated tapered aluminum Lower Material : magnesium Crown Material : forged, hollow 7050 aluminum Wheel Size : 29in Steer Tube Diameter : 1-1/8 - 1-1/2in tapered Stanchion Diameter : 35mm Axle To Crown : 531mm Rake : 44mm Spring Type : DebonAir Damper : Charger Race Day Adjustability : external rebound, 2-position crown (Open/Lock) Lockout : yes Axle : 15 x 110mm Boost Brake Compatibility : post-mount disc Rotor Compatibility : 180 - 220mm Includes : 2 volume spacers Claimed Weight : [120mm, 44mm offset] 3lb 6oz Manufacturer Warranty : 2 years Activity : cross-country, trail