[Tongue Pirate]

I ended up going with 17's due to large brakes. It was tough as I really wanted 15's visually. I can't give you a difference in ride as I have no experience with either on a cobra. The one thing I have found in my research is that 16" tires, as the others have said, are nearly non existant. 15" tires offer a a little bit better selection but 17" are where it's at & there are a number of choices in price range & size!