got wheels in....now need freggin 25mm spacers...wtf

[TriGem2k]

275/40 will be too tall. You need to run a 35 series. I don't even think the 40 series would fit. You could even get away with a 285/30.

[djomlas]

what do you mean by too tall?

btw, they run this tire size on stock 18 corvette wheels and doesnt look bad at all.

[timothy]

For a tires size x/y, the x is tread width and y defines the sidewall height as % of x. Examples: 265/35 gives a sidewall of 265*0.35 = 92.75mm. 275/35 => 96.25mm. 285/30 => 85.5mm. Your proposed 275/40 sidewall will be 110mm which is significantly taller

[Topless]

DJ,
Standard tire diameter on your car is 25" front and rear. You now have 25" fronts and 26.5" rears. The rears may never fit right, will effectively raise your final gear ratio 6%, will raise your car up 3/4", and it may cause issues with you ABS. Are you sure you want those tires on the rear?? 265/35/18 or 285/30/18 would be a better fit. IMHO

[TriGem2k]

DJ, I concur with both Timothy and Topless. Say with the OEM tire sizes. Either 265/35 or 285/30

[porsche986spyder]

Originally Posted by TriGem2k

275/40 will be too tall. You need to run a 35 series. I don't even think the 40 series would fit. You could even get away with a 285/30.

He's right. A 285 would look sweet, and a 40mm side wall will be to tall and will rub against your fender when you hit a pot hole.

[markab986]

Use this as a simple guide...

http://www.discounttire.com/dtcs/infoTireMath.dos#