SunRingle Duroc 30 Expert 27.5" Rear 142/9QR Wheel - Black27. 5 inch wheels using Duroc 30 rim (30mm outer 27mm inner width) with SunRingl STR Tubeless technology SRX cartridge bearing straight pull hubs with a 3 pawl alloy cassette body and 24 tooth ratchet ring, yielding 72 engagement points Laced up with time tested double butted Wheelsmith spokes Includes tubeless tape, valve and 2oz bottle of STR sealant Rear wheel includes both two driver bodies Non Boost models include end caps for both 10x135mm QR