Durability and an almost uncanny feeling of control on the trail have made Flow rims the preferred choice of multiple Red Bull Rampage riders, and today’s Flow goes even further. The Flow MK4’s reinforced spoke bed, combined with the offset drilling of the asymmetric design, builds into an incredibly durable wheel that brings added confidence to every ride. Unlike many rims, the BST Asymmetric shape is designed to equalize resistance to dents and tire bead retention on both sides of the rim under extreme conditions. Combined with Stan's patented Bead Socket Technology, the Flow MK4 rim offers the easiest tubeless setup and most reliable airtight performance on the trail. FEATURES: Low-profile 30mm internal width optimizes tire shape, traction, and control for 2.3-2.6” tires Durable 6069 aluminum with welded joint and reinforced spoke bed BST Asymmetric design combines Stan’s legendary easy tubeless inflation with a stronger, more balanced wheel build 3-year rim warranty with 1-year crash replacement SPECS: Hub Drilling: 32 Wheel Size: 29" ISO Diameter: 622 / Road / 29" Brake Track: None Rim Width (External): 33.6 Rim Joint: Welded Eyelets: None Rim Width (Internal): 30 Manufacturer Spec ERD (mm): 600 Rim Material: Alloy Rim Depth (mm): 18.9 Valve: Presta Defined Color: Gray Weight: 521g Tire Type: Tubeless Ready Valve Length: Short 32-40mm Rim Center Offset (mm): 3