Race Face Atlas 30 Wheel Rear 27.5'' 12x150/157mm TA 150/157mm Sram XD30mm Internal WidthTubeless Ready (tape and valves installed)4.5mm Offset improves spoke balance and wheel stiffness6069 Aluminum constructionDent and flat resistant bead design6 double tooth pawls (3 engage at a time)120 points of engagement (3 degrees)One length spoke used throughout wheelset (F&R)