Catalog info has this as a 7.5" fender...thats the outside dimension...( so i recon as our HARDCORE II is fitted with a 9" and a 200mm tyre fitted...see photo above ) this is aimed at a 160mm tyre use,  there is also a 8 & 1/2" version available, a 180mm use. They all have internal steel tubing for the wiring, which makes this an inside width of 6 & 5/8" ( 168mm ) which could be removed for more clearance. The radius is approx 13 & 3/8 with a 39 1/2" tire coverage & measures 26 1/2 straight across from end to end. It has a well rounded profile, keeping it snug to the tire, making it ideal for rigid frame use. Comes with a chain/belt cut out on the left side. This also has a double thickness fender tip area for paint work. Please contact us to list any other parts required....by catalog name & part number..

All dimensions are approximate and may vary from the original suppliers information supplied along with our added info.

Or....choose one for us to quote you from this chart ( as in last photo ) link below

https://www.custom-chrome-europe.com/fileadmin/user_upload/Blaetterkatalog/2015/INT/SEC_16/index.html#/26/