Sebastian777

It's about time for new tires on the rear. I believe I can fit 265s on the stock rims and 245s on the fronts when I change those next year. Question is, what will be the noticeable difference?

Car has bolt-ons and tune, 270 whp. It's a daily driver that sees spirited driving on curvy, hilly roads. No track time. Seldom, almost never, pushed to it's full potential.

Will the going up 2 sizes make the car feel more planted in the turns, grip more on fast take offs? Will I take I a hit in gas mileage? I'm sure theoretically I would experience all of this, just wondering if it would actually be noticeable. Anything that I'm not considering that I should?

Edit: after shopping on tire rack, looks like going up to 245/265s has very few options, so I might just go to 235/255s...

guitman32

iTrader: (15)

Based on all your caveats you should just stick to stock tire size and get a better compound. You didnt mention looks, which would be the primary reason for such a minor upsize.

guitman32

iTrader: (15)

based your edit of a 10mm upsize

MicVelo

Assuming 18s....

You didn't mention aspect ratios when you were looking at tires.

Proper Plus-0 (upsized for wheel constant) that keeps you as close to stock rolling diameter would be:

245/40-18
265/40-18

Both the 245s AND 265s are a wee bit above the 120% of wheel width guideline but only by a fraction (2mm & 6mm F-R respectively) and easily fits the 8/8.5" width wheel set. Not enough to introduce any significant slop in the sidewalls (at normal air pressure) to be unappreciated. That's usually the down side to putting way fat gumballs on "too skinny" wheels.

Honestly though, as was stated above, you may as well stick with the stock sizes if NOT upping wheel widths. Benefit to the increased tire width would be pretty much limited to and very slight uptick in ultimate grip depending on what tire you choose. It's an unappreciable difference in street/hills running.

However, if you upsize AND run slightly higher air pressure, you might be able to realize a bit of increased turn in response. Again, with the right tires.

BTW, these sizes are available in MANY great tires...

Bridgestone S04, Michelin PS2 and PS4, Kumho PS91, Conti Extreme, etc.

Sebastian777

I did notice that when I changed the ratio size. So right now I have stock rims and tire sizes. I should have mentioned I won't be using summer tires, need all season for both tread life and because I drive it in cold (dry) weather.

Currently I have Pirelli PZero+ A/S on the car. As I mentioned in another thread, kinda disappointed I only got about 25k out of the the rears. Thinking of trying comparable Michelin or Continentals this time around. Open to suggestions though. Just had rims powder coated, so not interested in changing them at this time, or getting a second set.

arficus

Don't expect to get even 25k miles if using hi perf tires or driving hard frequently. I'm happy if I get 10-15k.

Sebastian777

I never do burn outs, seldom even hear a tire squeal, figured I'd get more than 25k out of all season tires... Guess I was wrong.

No_name

That's where I'd be focusing, Conti EXTREMECONTACT DWS 06 in 235 & 255 if compelled to up-size or PILOT SPORT A/S 3+ 225 & 245. I'd go with the PS's but I have a a Michelin bias. A lot of good options in 225, 245 at varying price points and with a stock wheel-set, I wouldn't waste much time chasing different sizing options for limited (if any) performance benefit.