WTB Proterra Tough i30 Wheel Rear 27.5'' / 584 Holes: 32 12mm TA 148mm Disc IS 6-bolt Shimano Micro Spline30mm inner width tubeless ready, disc specific rim I Beam rim construction and 6069 alloy provides strength and support Frequency 6 bolt disc hubs feature double sealed bearings and a 6 pawl design with 5deg of engagement Built with WTB double butted spokes and black brass nipples TCS 2. 0 system includes pre installed solid strip, TCS tubeless tape and black alloy valves Rear wheels with the HG 11sp road FH body require the 1. 8mm spacer (included)