Extra wide design with notched (cut-out) sides to fit extra wide 180mm tires on a 5.50x18 rim. Offers bolt-on installation ease without modifications with stock smooth slider covers (fork boots). Fenders are made from a single piece of 14-gauge steel. 18" diameter cut to perfectly follow the contour of your front wheel. Note: This fat fender is compatible with Arlen Ness ''fork boots for fat fenders and wheels''; found in our ''suspension'' chapter. These fork boots have a cut-out section which makes them also bolt-on in combination with this wide fender.