Industry Nine Hydra 2 Grade S Wheel Rear 29'' / 622 Holes: 32 12mm TA 157mm Disc IS 6-bolt SRAM XDDesigned to take the toughest abuse from DH to park to full power eMTBs 0. 41 degress of engagement (878 points of contact) Approved for full power class 1 E bikes TECH SPECS Axle Type 12mm TA Freehub Body SRAM XD Hub Model I9 Hydra 2 Hub Spacing 157mm Position Rear Rim Color Black Rim Construction Double wall Rim Drilling F: 21 R: 24 Rim External Width 38mm Rim Internal Width 30mm Rim Material Aluminum Rim Model Grade S Skewers Included No Spoke Type