Im buying some 19" Wheels and the guy is telling me to get:

245/35/19 front 275/30/19 rear
or
245/35/19 front 275/35/19 rear

I don't understand why would he advise me to get different profile for front and rear? Surely it will look ridiculous.

Any ideas?


Thanks
ty50n

 

Because you don't understand how tire sizing works.

The profile is a percentage of the tread width (the larger number) so when you increase the tread width substantially the profile needs to come down in order for the tires to be the same overall diameter.
Overall diameter:
245/35: 25.75 in
275/35: 26.57 in
275/30: 25.49 in

The 275/35 is nearly and inch taller than the 245/35.

Now which tire set up do you think would look ridiculous?

 

+1 Understanding tire sizing will shed light on the OP's question.

 

Thanks for your response. So why does pretty much every 1 on here have the same profile both front and back?

 

It's preference or they just didn't know when they ordered the tires.

Some people like the raked look of having a beefier tire in the rear like an old dragtster, but it's not necessarily the best tire option. It's better to keep your tire diameters as close to the same size as possible.

 

It's best to keep the front/rear diameters close to the same or close to the oem stagger.
A few examples of same overall diameter with different profiles.
225/40/19 255/35/19 both 26.0"
245/35/19 and 285/30/19 both 25.7"
Some go with 245/35 front and 275/30 rear, but that puts the rear smaller than the front. I would error on the side of the rear being larger over the rear being smaller (thats why I went 275/35 in the rear).
Plus unless you have a fair amount of drop, the 274/30's will look too small.
I was going to go the 285/30/19 route for the rear, but when test fitting my front wheels on the rear (245/35/19) they looked too small. I only have a mild drop 1"/.5". If I were another .5-.75" lower it would look alright.

 

I would much rather have a .25 difference in overall diameter than a .85 difference.

1 inch is noticeable by eye, .25 inch isn't.

To me, I don't care how low you are, a 275/35 is too big and looks like crap.

 

Thats your personal preference.
I would rather have a tire that is .25" larger than stock than I tire that is 1" smaller than stock.
And thats my preference

 

Indeed, just like your 1 inch drop to my 4 inch drop lol

 

For sure.
2" or less is more to my liking. So with keeping
With that and that this car will passed onto my daughter.
I will keep it mild.
It suites me well.

 

Haha, my car couldn't get passed onto anyone. It would need so many new parts.

 

I thought running a shorter tire in the rear will throw off the VDC. So the 275/30 might be a bad idea since it's .25" shorter than the front.

Edit: You need to factor in the width of the rim as well.

 

Rim width has nothing to do with VDC. Overall diameter is what you have to wory about.

On the sedan I would think that the 1/4" less in the rear wouldnt be that much of an issue, but would cause VDC to interfere more during "spirited" driving with VDC on.
On a coupe I would think it would be an issue going from nearly a 3% front to rear to a 4% difference (from the oem set-up) with the rear being 1% smaller.

I dont own a coupe and ive never ran those sizes so this is simply speculation.

 

^ When I mentioned rim width I was referring to calculating the overall diameter. Same size tire on a wider rim = shorter overall

I borrowed loaner wheels once with stock 18's. The rear was slightly shorter than the front due to tire sizing and it threw off my VDC immediately when I started driving on it. Kept flashing and cutting power to the wheels.

OP what are your wheel sizes?

 

Uhhh, no you're wrong.

Whatever was going on with your car was something else.

You have to be doing some crazy *** **** to trip the VDC on these cars.