Peter, if you're looking for mudguards for 26 x 1.6 Supremes, suggest you look at 650B mudguards. I use these 52mm 650b alloy 'guards by Velo Orange on my Raven, and they offer good vertical clearance, as well as 5-6 mm on each side of the tire. The radius is obviously slightly different, but alloy can be easily persuaded to line up properly :-) There is a range of widths available as well as different types of finish and prices.