and your pointing this out why?
245/40/19(OEM rear size)=26.7" diameter
275/30/19=25.5" diameter
over 1" shorter than stock, does that still sound the same?

 

That's why
And his front is not 245/40

 

What does that have to do with aspect ratio's? Everything I've stated is true. I know how aspect ratios work.

You don't get it, the stock tire sizes have a height stagger front to rear. the 275/30/19 rear not only eliminates this, but it reverses it by making the front taller than the rear. This will change the handling characteristics of the car.

 

OEM 17 Inch: 225/50R17; 235/50R17
Sidewall: Front 4.4 Inches Rear 4.6 Inches

OEM 18 Inch: 225/45R18; 245/45R18
Sidewall: Front 3.9 (almost 4) inches Rear 4.3 Inches

OEM 19 Inch: 225/40R19; 245/40R19
Sidewall: Front 3.5 Inches Rear 3.8 Inches


OP Setup: 245/35/19; 275/35/19 or 275/30/19
Sidewall Front 3.3 Inches Rear 3.7 Inches or 3.2 Inches

With 275/30 rear is 0.2 lower then front. That is 2 tenth of an inch.

It is not enough to offset any weight balance or airflow.

On the track it will only be positive factor due to a smaller sidewall and less tire play.

 

How is it not enough to effect weight balance? The car goes from having a raked stance to a sagging rear. Not to mention gearing changes and possible VDC issues. Any way you cut it, 1.2" shorter overall diameter in the rear compared to stock will change the way a car handles

 

1.2 will 0.2 will not

 

You still don't get it. You have to compare the height to the stock size, not the front size. The stock tire sizes are 225/40/19 and 245/40/19, an ~1" height stagger, the 245/35/19 matches the 225/40/19 diameter pretty well while the 275/30/19 doesn't even come close to matching the rear size. The front and rear tires are NOT supposed to have the same diameters.

 

Look at all this diff sizes

OEM 17 Inch: 225/50R17; 235/50R17
Sidewall: Front 4.4 Inches Rear 4.6 Inches

OEM 18 Inch: 225/45R18; 245/45R18
Sidewall: Front 3.9 (almost 4) inches Rear 4.3 Inches

OEM 19 Inch: 225/40R19; 245/40R19
Sidewall: Front 3.5 Inches Rear 3.8 Inches


OP Setup: 245/35/19; 275/35/19 or 275/30/19
Sidewall Front 3.3 Inches Rear 3.7 Inches or 3.2 Inches

 

and.....

 

To the OP, if you don't have toe bolts, get them. Pretty inexpensive and the install is relatively easy. If you have toe bolts with the SPC camber kit, ensure they're installed correctly with the elongated holes and that your alignment shop knows there is adjustment. Then run a 275/35.

 

Joker, you lose on this one, you somewhat have an understanding, but you're failing to see the bigger picture. Even if you look at the 275/30, compared to the 245/35 front, the front is still greater in diameter than the rear which should NEVER be done. Sidewall height makes no difference as long as the diameter in the rear is greater than in the front (just how it comes from the factory)
-GP-

 

just trying to be like you man.

Making bunch of useless points.

 

it's only 0.2 smaller

You'll never notice that.


Anyways. With todays gas prices you want to go taller and thinner

 

You keep saying this, but you aren't getting the bigger picture, its 1.2" smaller than stock, that is the key.

 

enough with the arguing. op stick with 275/35/19. tires wont affect your camber issues. like bruce said, get toe bolts. you never mentioned your alignment specs.