The Arch MK4 rim is light enough to take XC racing but was born from research and testing on the Enduro World Series circuit making it a great rim for anyone looking to improve both descending and climbing. Constructed of light and strong 6069 aluminum alloy with a reinforced spoke bed and 28mm internal width ideal for 2.2-2.5" tires the Arch MK4 can get you up the climbs easier and make the descent even better. Utilizing Stan&';s patented Bead Socket Technology combined with a stronger asymmetric design for balancing control and weight the Arch MK4 your best choice for all-around riding.Versatile 28mm internal rim width optimized for 2.2-2.5" tiresLight and durable 6069 aluminum with welded joint and reinforced spoke bedBST Asymmetric design combines Stan&&';;s legendary easy tubeless inflation with a stronger more balanced wheel build3-year rim warranty with 1-year crash replacement TECH SPECS table{border-collapse:collapse;width:100%;} td{text-align:left;padding:8px;font-weight:350;} tr:nth-child(even){background-color:#f2f2f2} th{background-color:#eb212e;color:white;text-align:left;padding:8px;} .desc .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Brake Compatibility Disc Only Rim Width (External) 31.4 Rim Width (Internal) 28 Brake Track None Manufacturer Spec ERD (mm) 561 Valve Presta Valve Length Short 32-40mm Color Black Weight 451 Wheel Size 27.5" Defined Color Gray ISO Diameter 584 / 650b / 27.5" Eyelets None Hub Drilling 32 Rim Joint Welded Rim Depth (mm) 18.9 Rim Material Alloy Tire Type Tubeless Ready Rim Center Offset (mm) 2.5