Rockshox Bo XXer Select - 29" Boost(TM) Fork Maximum control and composure at the highest speeds The Rock Shox Bo XXer Select 29" Boost Fork is built for one purpose: keep the bike's front end composed when the trail is doing everything it can to knock you off your line. The new Linear XL air spring has a coil-like ride feel, with a supple top end for traction, supportive through the mid-stroke for stability, and finished off with a jounce bottom-out bumper that keeps the last part of the travel controlled, not chaotic. Or, select the Debon Air+ air spring for a balance between buttery-smooth small bump absorption and a higher ride height with support throughout the fork's travel. The Charger 3. 2 damper and Butter Cups technology pair up to filter out high-frequency chatter. The new Rock Shox Bo XXer stays quiet, predictable, and fast through anything you throw at it, exactly what you want when the clock is ticking. Features New Linear XL air spring delivers a consistent, predictable ride feel with a jounce bottom-out bumper for end-stroke control Optional Debon Air+ air spring for a buttery-smooth top end feel, with support throughout the fork's travel, and a higher ride height Charger 3. 2 RC damper updated rebound/compression tunes to match Linear XL, for quiet, focused performance on rough descents Numbered compression control bezel makes setup simple; start at "0" and adjust with clear, repeatable reference points Butter Cups technology blocks 20% of high-frequency trail chatter to reduce hand and arm fatigue Low-grab SKF wiper seals improve small-bump feel and deliver long-lasting performance Bolt-on fender compatible front and rear coverage (Bo XXer Bolt-On Fender sold separately)SPECIFICATIONSWheel Size29"Axle Type20x110mm - BOOST(TM)Spring Linear XL Air Spring or Debon Air+Damper Charger 3. 2 RC2 with Butter Cups Compression Adjust High-Speed Compression (HSC) / Low-Speed Compression (LSC)Fender Compatibility Bolt-on fender compatible (Bo XXer Bolt-On Fender sold separately)Intended Use Downhill Stanchion Diameter38mm | Rockshox | Boxxer Select - 29" Boost(TM) Fork 20X110 200Mm | Black | 52