18" wheels, need tire gurus

BlackenedSVT · Mar 28, 2007

So i curently have 17x9 and 17x10.5" 95 Cobra R wheels on my GT. I think the tire sizes are 245/45/17 and 315/35/17 in the rear.

I just ordered some Hypercoated FR500 wheels in 18x9 and deepdish 18x10" wheels from AmericanMuscle.

What is a good matching tire size i can run on these new 18s? Should i keep it relatively the same ballpark as the 110 diameter that the 245/45 and 315/35 are equalling? Know what i mean?

I have a guy that can set me up with a great deal on Toyo Proxies T1Rs for about $150 for fronts and $180 for rears.

What tire sizes should i run on an 18x9 and what about the rear?

I think the LARGEST tire size he has for the toyos is 295/xx/18. Is that wide enough for a 10" wheel? Or would that be hard to get on there because its undersized?

And would a 265/xx/18 be TOO BIG for the front 9" tire?

san~man · Mar 28, 2007

SteedaGTJ22 said:
What tire sizes should i run on an 18x9 and what about the rear?

I think the LARGEST tire size he has for the toyos is 295/xx/18. Is that wide enough for a 10" wheel? Or would that be hard to get on there because its undersized?

And would a 265/xx/18 be TOO BIG for the front 9" tire?

No smaller than a 265 on the front and a 295 on the rear.

BlackenedSVT · Mar 28, 2007

san~man said:
No smaller than a 265 on the front and a 295 on the rear.

interesting. I have 245/45's on my 17 wheels now and they are 9" wide. Those tires seem like a perfect fit for my 9" wheel. Not narrow at all and not overlapping at all.

What makes you say no smaller than 265 on a 9" wheel?

BaXTeR3221 · Mar 28, 2007

san~man said:
No smaller than a 265 on the front and a 295 on the rear.

I agree. I run 275's up front and they are just a tad too big. I wouldn't go any smaller than 265 tho, they are just right. As for the rear, if i had the cash, i would have gone bigger, but 305/315's are expensive.

'03GTinFLA · Mar 28, 2007

http://www.1010tires.com/TireSizeCalculator.asp
I played around on this site when buying tires and it helped. You can compare sizes and it shows you what they look like and what tire manufactures make those sizes, etc.
I run 275's all around on an 18x8.5. I think they look great and work well but I'm no auto X expert or anything.

SaleenGT2001 · Mar 28, 2007

265/35/18 on a 18x9 rim and 295/35/18 on a 18x10 fits perfectly

san~man · Mar 28, 2007

SteedaGTJ22 said:
interesting. I have 245/45's on my 17 wheels now and they are 9" wide. Those tires seem like a perfect fit for my 9" wheel. Not narrow at all and not overlapping at all.

What makes you say no smaller than 265 on a 9" wheel?

Although they may look fine, your sidewall is probably stretched and exposing your rim's lip.

BlackenedSVT · Mar 28, 2007

what about keeping the front and rear tires in a comparative ratio with one another? how much does that matter? SALEENGT2001 said to go 265/35 up front with 295/35 in the rear...yet the diameter of the front is 92.75 then and in the rear its 103.25

Thats a big diference, how much will that effect the speedo AND/OR performance in anyway??

I think 265/40 is a better viable option in the front, then go with 295/35 in the rear

san~man · Mar 28, 2007

SteedaGTJ22 said:
what about keeping the front and rear tires in a comparative ratio with one another? how much does that matter? SALEENGT2001 said to go 265/35 up front with 295/35 in the rear...yet the diameter of the front is 92.75 then and in the rear its 103.25

Thats a big diference, how much will that effect the speedo AND/OR performance in anyway??

I think 265/40 is a better viable option in the front, then go with 295/35 in the rear

Or go a 30 series in the back. A 40 in the front will be too tall and will be prone to rubbing (depending on your drop).

I've got H&R SS's and on very hard cornering, I can rub the fronts.

18" wheels, need tire gurus

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