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.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.The Arch MK4's BST-Asymmetric shape improves spoke angle, allowing for a stronger overall wheel build. Unlike most asymmetric rims that struggle with tubeless inflation and consistent airtight seal under hard cornering, the Arch MK4's shape is designed toVersatile 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--