SDG Bel-Air RL Saddle CrMo Rail - Black ModelNumber=K4307 Its Sacred Geometry hollow bead

Its Sacred Geometry hollow bead wall and Bead Bite tubeless interface improve lateral stiffness impact resistance and air retention—even under low pressure

Number of Chainrings No Rings No Spider IncludedDrivetrain Speeds 12Drivetrain Speeds 13Chainring BCD Direct Mount SRAM 8-BoltChainline/Hub Compatibility 135/142 Road Disc Hubs < 415 mm ChainstayChainline/Hub Compatibility 135/142 Road Disc Hubs > 415 mm ChainstayColor BlackCrank Length (mm) 160Crank Intended Use RoadCrank Intended Use GravelBB Included NoPedal Spindle 9/16"Spindle Interface Type SRAM DUBDefined Color Black

and this is the second fluor-free MWC

A wider bead wall effectively reduces pinch flats and increases impact resistance

color:#3e4951}

SDG Bel-Air RL Saddle CrMo Rail - Black ModelNumber=K4307 Its Sacred Geometry hollow beadComfort, pressure relief groove on top Synthetic top with Kevlar sides, or microfiber with Cordura sides, generous foam padding Traditional railed saddle with nylon carbon base. Nose and tail guards Model Bel Air RL Rails CrMo Top Synthetic Color Black LxW (mm) 270x140 Weight 320g