The Crest MK4 combines the heritage of Stan&&';;s legendary tubeless design with today&&';;s best materials and a stronger asymmetric design. The BST Asymmetric rim design allows for a stronger wheel while offering the easy inflation and Stan&&';;s trademark unmatched airtight seal. The Crest MK4 rim is optimized for 40mm Gravel tires and up to 2.3" mountain tires making it a great versatile choice for a wide range of bikes and riding styles.25mm rim width optimized for Gravel and XC tires up to 2.3"Light 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) 28.4 Rim Width (Internal) 25 Brake Track None Manufacturer Spec ERD (mm) 563 Valve Presta Valve Length Short 32-40mm Color Black Weight 374 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 Rim Material Alloy Tire Type Tubeless Ready Rim Center Offset (mm) 1.5