Stan&';s heritage comes full circle with the latest generation of Crest rims. Built for speed and optimized for 40mm gravel tires and XC tires up to 2.3" 25mm rim width optimized for Gravel and XC tires up to 2.3" Light and 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 Wheel Size: 27.5" ISO Diameter: 584 / 650b / 27.5" Brake Track: None Rim Joint: Welded Eyelets: None Rim Width (External): 28.4mm Rim Width (Internal): 25mm Rim Depth: 18mm Manufacturer Spec ERD: 563mm Holes: choose; 28h, or 32h Rim Material: Alloy Valve: Presta Tire Type: Tubeless Ready Valve Length: Short 32-40mm Rim Center Offset: 1.5mm Weight: 374g. Color: Black