andrewmg

just bought some 18×7 wheels and was thinking of running a 215/35r18 tire, would I have any problems with that? Car has stock suspension and stock fenders.

Turbonut

iTrader: (1)

I'd say the diameter is too small.
OEM 205/55-16" (24.9")
215/35-18 (23.9")
In the 18" range I'd say 225/40-18" (25.1") all around or some add 255/35-18 for the rear tires(25.0"), but wheel width is too narrow as the 225 requires a 7.5-9" wheel and 255 8.5-10".

professionalpyroman

In addition, your spine will not like the 18's as much.

andrewmg

do you mean the aspect ratio? cause 18 is the diameter I need for a 18" tire, I want something that will not be too huge but also not look goofy cause it doesnt fill in the gap at all.

Turbonut

iTrader: (1)

No, 18" is the inside diameter, but the outside diameter (23.9") is 1" smaller than the OEM 205/55-16" (24.9") tires. In fact, Mazda was going to use 215/55-16" (25.31") tires, but at that time the 215/55-16" tire was just about non-existent, therefore the 205 was used.
I have 215/55-16" in front and 235/50-16" in rear and they certainly don't fill out the wheel well.

andrewmg

o ok makes sense so with a 18" what size tire would help fill out the wheel well but not be too big?

Templeton

iTrader: (10)

205/45/18 would be only slightly larger in diameter than stock and be a good for for those wheels, 225/40/18s would also do the trick but would bulge over the wheels a bit.

I wouldn't anticipate any fitment problems with those wheels, they should fit in the fenders like stock.