: New Goodyears



Carnalsupply
03-20-06, 01:26 PM
After 12,000 miles my original RunFlats were toast and Goodyear saw fit to give me a $260/tire credit. Maybe not as much as others have received, but I was happy nonetheless.
My local Goodyear dealer finally got my DS-G3's in (245's and 275's) and mounted them up on Saturday. What a beautful thing! Smooth, quiet, fills the wheel well up nicely, and all for $570 mounted and balanced.
As others have said: If your OEM runflats are toast, make sure to contact your local Goodyear dealer, and if they don't know what your talking about then contact Goodyear directly, they were terrific to deal with (even though the dealer WAS NOT).

GT04CTS-V
03-20-06, 05:25 PM
What were the new tire sizes?

245/45/18 front ???

275/40/18 rear ???


Thanks,

Gary

ndogg ct
03-20-06, 05:36 PM
so is this the setup most are using and why??

Luna.
03-20-06, 06:17 PM
I'm not sure I would say most. As a matter of fact, I'd guess few. That does NOT mean that that setup isn't a good one, only that I just don't think that most are using 275s in the rears. Could very well be wrong though...

Personally, I'm running 255s all the way around.

CVP33
03-20-06, 07:30 PM
Wildwhl, Fuggetaboutit, Dreamin and others have run this combo, 245 and 275. I like the 255 all around like Luna. I did that with the GSD3's and several other sets. You have to admit though, 275's out back look incredible. :thumbsup:

ndogg ct
03-20-06, 07:59 PM
i would just worry about going down to 40 series here in new england...
so is everyone switching to 40??

CVP33
03-20-06, 08:12 PM
i would just worry about going down to 40 series here in new england...
so is everyone switching to 40??

When your fronts are 245/45 you need to lower the aspect ratio to 40 on the 275/40's so your overall diameter is the same or close. The CTS-V's computer does not like mismatched tire diameters. I believe we had forum members with Traction Control problems after installing a mismatched set. The computer thinks the front wheels are spinning faster than the rears and tries to apply the breaks to stop it. Not good.

thebigjimsho
03-20-06, 11:24 PM
i would just worry about going down to 40 series here in new england...
so is everyone switching to 40??The sidewall aspect ratio is just that, a ratio. What it means is with a 245/45 18 tire, the treadwidth is 245mm wide. The 45 means that the sidewall height is %45 of 245mm which equals 110.25mm of sidewall. Going to a 40 series tire doesn't mean that your sidewalls will be shorter because your treadwidth is wider. When going to a 275/40 18 tire, the width is 275mm and %40 of that is 110mm.

So the difference between the 2 tires is .25mm. Which is so negligible the Stabilitrak thinks everything is the same. And your ride won't suffer one bit, nor will there be increased risk to pothole damage.

Carnalsupply
03-22-06, 05:01 PM
Yep, the rears are 275's and they fit great. The tire fills the wheel opening much better.
Yes, the tires are nearly identical diameter for the exact reasons noted.
The GS-D3's are SO much nicer than the run flats, smoother, quieter, grippier, better in every way I can tell so far. I HIGHLY recommend them and going to the 275's in the rear.

GOTTSPD
03-22-06, 06:23 PM
Are all of you that are running 275's out back running on the stock rim?

Mat347
03-22-06, 06:34 PM
Yup, 275/40s in back with the stock rims. It baloons just a bit, but fits the Vs image nicely IMO.

Carnalsupply
03-22-06, 06:57 PM
Yep, the 275's are an EASY fit on the stock rim, much to my surprise. I expected much more of a ballooning effect to the sidewall, but it's actually quite minimal.
I haven't checked the clearance on all the suspension and fenderwells, but I'd be curious if a 285 might even fit.

Ryan's '05-V
03-22-06, 08:25 PM
I just put a pair of 285/35/18 GSD3s on the rear today and the ride home was fine. They do stick out the side some but still look sweet.
They should be fine.

99GTX
03-23-06, 07:56 AM
Do the people w/ the mixed sizes still rotate their tires? I normally only do rotations front to back. I realize you could still rotate front to back, but does that adversely affect the handling having wider tires on the front?

atdeneve
03-23-06, 08:26 AM
Depends on whether you consider perpetual oversteer (of course, as dictated by your driving style; i.e., whenever you get on it) to constitute adverse handling.

Ryan's '05-V
03-23-06, 02:09 PM
I did front to back with I had all stock sizes but I don't plan to rotate my 285s from the rear to front, that would look stupid and defeat the purpose of having a wider tire out back. All I would do is switch sides with them if needed but I don't plan to do that either. With directional tires like my GSD3s you would need to remove the tires from the rims to put them on the other side per Discount Tire and that makes sense.

verbs
03-23-06, 03:17 PM
i would just worry about going down to 40 series here in new england...
so is everyone switching to 40??

40 series tires are not necessarily shorter in height than a 45 series tire.

The way to figure out tire height is this:

245/45/18= 245cm*.45= 110.25cm
275/40/18= 275cm*.40= 109.6cm

So the difference in tire height between these two tires is only .65 cm which is basically neglegible.

verbs
03-23-06, 03:18 PM
I just put a pair of 285/35/18 GSD3s on the rear today and the ride home was fine. They do stick out the side some but still look sweet.
They should be fine.That's too big on stock wheels (I'm assuming you have wider than stock wheels). You're not going to get any more contact patch with a 285 width tire over a 275 width tire on an 8.5" rim.

Ryan's '05-V
03-23-06, 03:42 PM
No, I have the stock rims. You're probably right but since my replacement Runcraps aren't lasting very well I need a pair of tires to get me through me lease. The 285/35 were about $50 less than the 275/40 for a pair so I bought those figuring the tires will be thrown away when my lease is up in 14 months. I just didn't really care and I knew they fit so I pulled the trigger.
I wanted to go the 275/40 route but the 285/35 is only about 3.12% smaller than they 245/45 so I should be fine.

thebigjimsho
03-25-06, 12:42 AM
40 series tires are not necessarily shorter in height than a 45 series tire.

The way to figure out tire height is this:

245/45/18= 245cm*.45= 110.25cm
275/40/18= 275cm*.40= 109.6cm

So the difference in tire height between these two tires is only .65 cm which is basically neglegible.pssst. it's not cm, it's mm.