New SID SL Ultimate chassis features increased stiffness, lighter weight, and reduced friction. Torque cap compatible for stiff dropout/hub interface. Spacing: 15 x 110mm Thru Axle (BOOST). The item "2021 RockShox SID SL Ultimate Brain 29 100mm Suspension Fork 15x110mm Boost NEW" is in sale since Saturday, July 10, 2021. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Forks".The seller is "benscycle" and is located in Milwaukee, Wisconsin. This item can be shipped worldwide.