I have nto5s all around on 949 rims 17x9 front 255 and 17x10 rear 275.... I'm now on ready for my 3rd pair of rears but fronts have another season left on them. Working if I could mix and match something else in the rear? Any suggestions. Looking for good dry performance and some track duty hpde maybe an Autox

 

Should be fine as long as you stick with a tire that has 200 treadwear or less. I have bridgestones up front and NTO5's in the rear and I don't see a problem with it.