Mountain bikes have changed in the decade since the original Arch rim helped introduce the world to tubeless technology. With a 28mm wide asymmetrical rim shape and ultra-strong 6069 alloy, today's Arch MK4 rim has evolved to meet the demands of higher performance bikes. Throughout its testing and evolution, one thing has never changed: versatility. Now more than ever, the Arch MK4 is the rim for you if you're looking for a reliable rim that can handle any trail.

The Arch MK4 rim is light enough to race cross-country, but it's also the result of research and testing on the Enduro World Series circuit. Made from a lightweight and strong 6069 aluminum alloy, it features a reinforced spoke bed and an internal width of 28mm, ideal for 2.2 to 2.5-inch tires, allowing for easier climbs and even better descents.

The BST Asymmetric shape of the Arch MK4 improves the spoke angle, allowing for a more stable overall wheel design. Unlike most asymmetric rims that are difficult to inflate and don't seal evenly when cornering hard, the Arch MK4's shape is designed to distribute pressure evenly on both sides of the rim for easy inflation and strong tire retention.

Stan's patented Bead Socket Technology, combined with a stronger asymmetric design, lightweight and durable 6069 alloy, and the perfect rim width to balance control and weight, make the Arch MK4 your best choice for all-around riding.

Rims - Valve hole: French (SV) - Width: 31.4 mm - Compatible tire size: 29 inch - Suitable for disc brakes - Diameter valve hole: 6.5 mm - Mouth width: 28 mm - Tire type: clincher tire. Equipment - Features: Tubeless Ready. Main information - Type of construction: drop center rim - Type of material: aluminum - Area of use: MTB. Details - Height: 18.9 mm - Maximum spoke tension: 1275N - For rim strip 30 mm - ISO: 29" x 31.4 mm - ETRTO: 622 x 28.0 (29") - ERD: 600 mm, 2.5 mm offset (29").