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Are the couple wheels the same as the sedan? If so does that mean we can have the coupe time sizes ?
The largest tires to go on the stock sedan wheels which are 8 1/2 front and 9 1/2 rear are 255 front and 285 rear if you are interested in the correct fitment and not just what size you can get on without rubbing.
255/35R19 for the front and 275/35R19 for the back?
Are they both 35 profile? Some people are stating the back tires should be 30 and not 35.
I would not go to a 30 aspect ratio as it does not fill the wheel well as much unless your going to lower the car and then you could go either way. But remember the suspension is stiff already and a 30 would make that worse.
I plan on going 295/30 on the rear when the 265's are gone. The difference in radius between 265/35 and 295/30 is roughly 1/8 inch which will not provide very much of anything visually, except from the back.where they are 1.5" wider each. Since I don't autocross anymore and have no plans on power sliding corners on the street I don't see an issue having the rims 1/2" width under standard recommendation. Several have advised the PS4S fits at that size without rubbing.
Last edited by midareff1; Jun 15, 2018 at 11:50 AM.
Reason: add info
255/35R19 for the front and 275/35R19 for the back?
Are they both 35 profile? Some people are stating the back tires should be 30 and not 35.
The 35/30 numbers are the aspect ratio that describe the sidewall height of the tires. The number represents a percentage of the tire's width, not a measured length. So a 305/35-19 tire will have a larger sidewall than a 245/35-19 tire even though the aspect ratio is the same (35% of 305 as opposed to 35% of 245). If you want to keep the sidewall height the same, as you go significantly wider you eventually have to lower the aspect ratio.
With the sizes you are talking about, 35 is the way to go.
The 35/30 numbers are the aspect ratio that describe the sidewall height of the tires. The number represents a percentage of the tire's width, not a measured length. So a 305/35-19 tire will have a larger sidewall than a 245/35-19 tire even though the aspect ratio is the same (35% of 305 as opposed to 35% of 245). If you want to keep the sidewall height the same, as you go significantly wider you eventually have to lower the aspect ratio.
With the sizes you are talking about, 35 is the way to go.
I agree.
With a 9 1/2 inch rim the widest Acceptable tire is a 285 and the preferred is a 275.
Just rubbing is not the whole reason to choose a size. The shoulder of the tire is not supported enough if you go wider and the face of the tire is not in full contact. The latest Corvette just added a 1/2 in wider rim to its tire with the same size tire as they say it did not support the shoulder enough. Also the 30 aspect tire is smaller and won't fill the wheel well . It was said it is not much smaller but if you go larger with a 35 it is larger than the stock. a 295 /30 is 26.0 inches and a 285/35 is 26.9 so you get a better ride and .9 in. larger tire to fill well.The ride is some what better and I think it is too firm now and I would not want worse.
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