The Maxle Ultimate front thru-axle by RockShox is the easiest-to-operate axle system on the planet. No tools, no worries, so you can concentrate on the trail ahead. Details: Maxle Length: 146.5mm Hub Spacing: Non-Boost (15 x 100mm), Boost (15 x 110mm) Length: 146.5mm Thread Length 9mm Thread Pitch: M15 x 1.50 SKU: 00.4318.005.001 Maxle Length: 156.5mm Hub Spacing: Boost (15 x 110mm) Length: 156.5mm Thread Length 9mm Thread Pitch: M15 x 1.50 SKU: 00.4318.005.007 Not compatible with SID Ultimate Boost forks