on the sedan. These tires are 2.1% smaller than the oem 215-5-17. A 245 on the coupe front "should" be well within the 8" size spec.

Question is 2.1% difference small enough?

FWIW. the stock coupe 19 sizes of 225-40-19 was a smiggen smaller than stock (0.9%)while the 245-40-19 was a touch taller than stock (1.5%). But none of them was more than 2% different than stock.

what is your purpose for doing so?

Just exploring my options since I need to replace my tires soon. Another combo would be 255-35-19(r) and 235-40-19 (f).

you shoulda just PM'd Hai and Pat.. that's what i did.. lol

myself and many others have ran 245/35/19 on our sedans. it is smaller, but besdies that, i had no issues. i mean, as long as you don't mind that overtime it'll rack a few more miles on your odometer . i'm assuming you want to run those for a wider footprint, but keeping it rotatable still

I guess front/rear rotation would be a nice benefit. Thanks for the confirmation. The slightly smaller size would help offset the slightly heavier wheel/tire combo of the coupe 19 wheel/tire

umm weights. J/k, if you want to keep the same diameter, go with 225/40 f and a 255/35 rear. I think they are the same rolling diameter or maybe just a hair off. If I change up to 19's that is what I am planning on doing.

you could run them it will be slightly off speedometer .

im running 245 40 19 front 255 40 19 rear rides great and fills the gap well

why not run 245-40-19 all around? tire too expensive?

I'll look into the weights and advise. LOL.

I know the various sizes that will be close. Just wanted to know if 2.1% was over the limit vs the oem sizes.

I need tires fairly soon and just wanted comments on this size and if there any negative effects.

IMHO I think 2.1% is okay.

If I had a choice, I'd rather not run the 245-40-19 as it's a tad taller than oem. If anything I'd like to run something a touch smaller like a 255-35-19 in the rear.

why?

I'm currently running 245/45/18 all around on my staggered set of 350z track wheels. fills the gap nicely and rides comfortably

bigger tire diameter will slow down your car

Reading and learning.

you're in the wrong thread for that