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Old Mar 6, 2017 | 12:18 PM
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Default Tire sizing question

Hey guys. Just put stock tires on wheels that are a half inch wider all around. Looks okay at best... Wanted to step up to 305 in the rear and 265 up front. My question is, should I step the sidewall up 5mm all around too to fill some wheel gap? Or just stay the same series as stock? Anyone ever do this? It's stock height now.

Thanks in advance
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Old Mar 6, 2017 | 01:19 PM
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Lower the car if you want to get rid of gap, tires with more sidewall look ridiculous. I'd go down 5%, not up 5 mm. You're also going to find very few tires in a 305/35.
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Old Mar 6, 2017 | 02:45 PM
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Originally Posted by 919cw313
Lower the car if you want to get rid of gap, tires with more sidewall look ridiculous. I'd go down 5%, not up 5 mm. You're also going to find very few tires in a 305/35.
Alright, it's been awhile since I had to think about tire sizing... The car already doesn't fit on a 2 post lift. I couldn't imagine going much lower lol
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Old Mar 6, 2017 | 05:51 PM
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It will depend on the rim offset and tire height. Yes, the 35 series will fill in the gap, but to what expense? Tire rub?

I am running Michelin S.S. 265/35/18 in front and 305/30/19 in the rears with 1/2" wider rims all around on a base coupe. With a full tank of gas, two people in the car, at highway speeds going over a hard bump is the only time I might get a slight rub on the rear inner fender liner. If I had a 305/35/19 tire on the same rims, I most likely would encounter more tire rub. The Michelin S.S. 35 series tire is 1.1" taller than 30 series. My rear rims have a 65 mm offset, which pushes the car outbound towards the outer fender. My car is also stock height.

Last edited by Mike's LS3; Mar 6, 2017 at 05:51 PM.
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Old Mar 6, 2017 | 07:05 PM
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Originally Posted by Mike's LS3
It will depend on the rim offset and tire height. Yes, the 35 series will fill in the gap, but to what expense? Tire rub?

I am running Michelin S.S. 265/35/18 in front and 305/30/19 in the rears with 1/2" wider rims all around on a base coupe. With a full tank of gas, two people in the car, at highway speeds going over a hard bump is the only time I might get a slight rub on the rear inner fender liner. If I had a 305/35/19 tire on the same rims, I most likely would encounter more tire rub. The Michelin S.S. 35 series tire is 1.1" taller than 30 series. My rear rims have a 65 mm offset, which pushes the car outbound towards the outer fender. My car is also stock height.
The SS run kinda wide as it is... You have any pictures? I have about 2.5 inches of wheel gap and it looks pretty bad lol. And a 305/30/19 is smaller over all diameter than a 285/35/19. So I'd end up with even more gap lol
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Old Mar 6, 2017 | 08:05 PM
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A buddies car. 305/35-19 NT05R on stock wheels. .500 taller than a 285/35-19. A little rub on inner fender liners (they're cheap) when lowered. I actually think it looks good.


If you are talking about wheels that extend out .500" more than stock...im not sure how the 305/35 would be. Guessing ok if not lowered but not sure.
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Last edited by Curt D; Mar 6, 2017 at 08:07 PM.
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Old Mar 6, 2017 | 08:07 PM
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Originally Posted by Curt D
A buddies car. 305/35-19 NT05R on stock wheels. .500 taller than a 285/35-19. A little rub on inner fender liners (they're cheap) when lowered. I actually think it looks good.
I feel like that's where I wanna be. Do you k ow how far it's lowered?
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Old Mar 6, 2017 | 08:13 PM
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We cut 1 pad off the rear and ran the bolts in. Im guessing .5".
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If you want to fill wheel gap, do 305/35/19 back and 255/40/18 front and turn down the lowering bolt a little, should be a good compromise.
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Old Mar 6, 2017 | 11:11 PM
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Originally Posted by Csimile88
The SS run kinda wide as it is... You have any pictures? I have about 2.5 inches of wheel gap and it looks pretty bad lol. And a 305/30/19 is smaller over all diameter than a 285/35/19. So I'd end up with even more gap lol
Yes, the SS do run wide and the difference between the 30 series tire is 1" more tread width than the 35 series. The gap between my fender and the rear tire is about 2". This is on a 2008 Z51, Bilstein sport shocks and stock ride height. You can always adjust the lowering bolts to drop the car.
If width is not important, then yes the 35 series is taller and will fill in the fender gap much better. Since you have aftermarket rims, make sure your wheel offset will provide enough tire clearance. On the Michelin SS, the 35 series is about .4" taller than the stock tire.

Last edited by Mike's LS3; Mar 6, 2017 at 11:12 PM.
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