The 591 is what's on the back of mine and as conservative as I drive it ground off like an eraser on a 1'st grader's #2. Can you tell any difference as far as normal handling with the 407? Since size is a factor I think my only choices are either a Metzler Me880 or a Dunlop Elite 3 for the 160/80B16. I'm running a ME880 on the front now and it has a slight cup pattern now but I can not fill it. Its makes a squeaky hard sound on my cement garage floor compared to Dunlop402