6" flat profile fenders are among the highest quality you will find; unlike others on the market, our fenders are actually designed for motorcycle use This is NOT another re-labeled trailer fender that doesn't fit the profile of a motorcycle tire properly 27" diameter that contours both 16" and 18" motorcycle rear wheels Heavy Duty 14 gauge steel construction is built to take the abuse that hardtail rigid frame choppers and bobbers can provide Undrilled and universal fit for custom fab applications 6" fender works great for up to a 140 series rear tire