The Endless 100 Frame is a precision machined, multi-setup frame designed specifically for the Seba/FR Skates FR series of freeride skates, and other 165 mm compatible skates. Features Multiple setups: 4x100, 3x110 Balanced Rocker for 4-wheel setup Flat configuration for 3x110 setup Recommended for Intermediate and Advanced skill levels Mounting: 180 mm (*may not be compatible with all boots - ask if you don't see your skate listed) Boot must have fully threaded 3-hole or 7-hole mounting plates Compatible boots: FR1, FR2 (2016 and newer), FR3, Seba Trix 2, Seba High Light (Carbon, V2), Seba iGoR, Flying Eagle F6/F7, Flying Eagle Drift, Micro Delta F (carbon cuff); 7-hole mounts Not compatible: FRW, FRX, FR2 (2015), Seba GT, Seba Trix (5-hole), Powerslide Imperial, Powerslide Hardcore Evo, Rollerblade Metroblade, Micro Delta (plastic cuff); 5-hole mounts; UFS boots Not compatible without professional modification: Rollerblade Twister Edge, Rollerblade Maxxum Edge, Rollerblade RB 80/110/DA: forward-most hole in front mount must be drilled and tapped for an 8 mm mounting bolt (perform at your own risk) Wheelbase: 303 mm Brake compatibility (not recommended for use with brake): 4x100: Powerslide Urban Brake Size L (908058/3) 3x110: none One frame set includes: 2 frames and 8 axles CNC-machined from 6061-T6 aluminum Weight = 320 grams, without spacers and axles