Gasbox has been making rear fenders for years, and these flawless rear fenders are a perfect fit for Avon MKII tires on 16" rims (5.00-16" tires) as well as other similar dimension vintage-style tires. They hug it close but with adequate clearance and follow the profile of the tire exactly. These have a bit more sidewall than many fenders allowing you to do something a bit different with your fender struts or sissy bar. 6" internal width for more clearance for mounting hardware, 27-1/4" diameter measured straight across tip to tip. The fenders are approximately 12 gauge steel, no flimsy fenders here!