Stan's No Tubes Grail Rim Disc Only, 700c 24h Black What Just Might Be The Ultimate Disc-Specific Rim For Road 'Cross And Gravel 24.1Mm External And 20.3Mm Internal Widths Featuring Stan'S Deepest Profile (24.5Mm) The Most Aerodynamic Rim Stan'S Has Ever Made Rivals Much Deeper Designs In The Wind Tunnel But Is Designed To Be Much More Than Just Fast In A Straight Line