First of all I did a search and did find my answer. I'm probably going to need to swap my stock summer tires sometime this summer. Since there are not a lot of options in the stock size of 225-50-18 for the front and 245-45-18 for the rear. I'm looking for alternates size i can use with my stock wheels.

I like the Yokohama ADVAN Sport and they come in my stock size. But people here are always mentioning the Yokohama S-Drives. But the tire I'm really interested in is the Hankook Ventus V12 evo.

So If I buy the Hankooks what alternate size can I mount on my stock rims without rubbing or messing up my speedo too much???

Thanks and I'll say this again, yes I tried the search.
I searched "G37S sedan tires sizes", "G37S sedan alternate tire sizes" and "G37S sedan tires."

 

Enter the stock sizes of your wheels/tires. Then try to find an alternate size closest to your stock size.

Wheel / tire size calculator / comparer - WWW.RIMSNTIRES.COM

 

I'm familiar with the tire calculators but I was wondering what other sizes our members use. I've played around with the Miata and the Discount Tire one in the past. But yours I've never seen before.
Thanks anyway.

 

I read at another forum about using 235-5018's for the fronts and 255-45-18's for the rear. But I would really like to know what sizes our members are using if they are not running with stock staggered size.

Also Neil in an older thread also suggested running 245-45-18's all around. That should work. I'm running right now 225-50-18's all around but they are my winter tires.

 

Anyone???

 

Are you keeping OEM 18's or getting a second set of wheels?

OEM 18's are 18x8.5 all around.

Are you looking for a "mid grade" tire, or a true all out performance street tire? These "mid grade" tires as you call them, come in your tire sizes, but the top performance street summer tires only come in sidewall profiles of 30, 35, 40, and 45 in 18's.

See: Tire Search Results

Keep in mind, on damp surfaces, summer tires will outperform any all season or winter tire. The place where they suffer is hydroplaning resistance. Their grip level on any surface without snow, ice, or standing water is superior to any other category of street tire.

 

I'm planning on keeping my stock wheels. I have no interests in all-season tires. I like using a combination of summer and winter tires depending on the season. In fact I still have my winter tires on. But they are coming off either this weekend or next.

The tires that interests me are in no particular order :
Michelin Pilot Sport PS2
REO50A Pole Positions
Hankook Ventus V12
Conti Contact Sport 3

If I keep my stock size my plan is to replace my REO50A's with the Yokohama
Advan Sport. Also I thought the OEM G37S wheels were wider in the rear.

Thanks.

 

One last thing were you suggesting I loose the staggered set-up and run 245-45-18's all around??? I always thought that RWD cars perform better with a staggered set-up.

 

Non-stagger increases front grip (e.g. braking/handling), and more importantly, gives you the ability to rotate tires. You're not "driving like you're at the race track", so you won't see any negatives to having non-staggered tires.

 

That's true. But aren't the rear wheels wider than the front on the RWD with sport package???

 

Yes, to add more rear grip in conjunction with the VLSD; the average sport package buyer is more likely to power out of a turn.

You're not losing any rear grip by widening up the front. Rather, the rear grip stays the same, but you have more front grip. At the limit, it'll make your car more rear happy, but the G isn't a race car, and it's already super stable from the factory due to a long wheelbase.

 

Thanks. What if I stay with a staggered set-up and run 235-50-18's up front and 255-45-18's in the rear. Would you know if this size would fit without rubbing or causing any other issues???

 

You won't rub at all with those sizes. The issue you may run into is VDC; the tire diameters are a little different. However, VDC will eventually adapt as you drive, as long as the tire diameters aren't drastically different; VDC has the ability to adapt for tire wear, and as long as the difference between the front and rear tires isn't too far off from factory ratios, it'll be okay. You may have VDC kick in unexpectedly the first few drives with the new sizes.

 

Thanks. I've read that the VDC does adapt. I'm going to have to think it over as I would prefer to keep my staggered set-up.

Although I'm running 225-50-18 LM60's right now with no issues.

 

A 245/45 x18 would basically be the same size, just a tad wider. thats what I had on the lexus gs300, no issues