Reserve's newest aero gravel race wheels are built to deliver more speed and more grip. A 30mm inner rim width creates a round, wide-stance tire and a larger contact patch. The super-wide external profile delivers noticeable aero advantages, allowing air to glide uninterrupted between the tire and rim sidewalls. Featuring a new innovative wide hollow-bead design, 48|53 GR wheels shave weight from the outermost section of the rim while also better preventing pinch flats. These are the fastest off-road wheels Reserve has ever made. FEATURES: 30mm Internal Width: Optimized for modern 40–57mm gravel tires, the 30mm internal width creates a wider tire profile and larger contact patch for increased grip, stability, and confidence across varied terrain. Aero-Optimized Rim Profile: A super-wide 44mm external profile helps airflow transition smoothly between the tire and rim, reducing aerodynamic drag and improving efficiency at speed. Hollow Hook Construction: New Hollow Hook construction removes weight from the outer edge of the rim while maintaining exceptional durability and pinch-flat protection for race-ready performance. SPECS: Depth: 48mm Front / 53mm Rear Internal Width: 30mm External Width: 44mm Spoke Count: 24 ERD: 545mm Front / 535mm Rear Asymmetric Offset: 2.8mm Recommended Tire Width: 40 to 57mm Freehub: XDr or HG Rotor: Centerlock Hub Spacing: 100x12 Front / 142x12 Rear DT Swiss 180 Build: DT Swiss 180 EXP 36T hub with a weight of 1,433g . DT Swiss 350 Build: DT Swiss 350 36T hub with a weight of 1,528g . Rim Only: 435g / 455g .