View Full Version : Tires/backspacing?

12-31-2002, 03:19 PM
I know this subject has been beaten to death, but I need some insight into some fit and a tire purchase for my '99 convertible. I picked up a new set of rims, 17x8, 5.5" backspacing for the front and 17x10, ~6.6" backspacing for the rear (6 5/8=6.625 :D ). Fronts are easy, but the problem is the rear.

1. Will I need a spacer to clear the IRS bolt?

2. What size tire for the rear? I was thinking a 295/35 would fit nicely, but if a 315/35 could fit, I wouldn't mind that either. :D

3. Lastly (I promise), any brand/type of tire you swear by? This will be a "spiffy" set of daily driving wheels ;) , so weather and wear will be factors.

Any info. would be much 'preciated. :thumbsup:

12-31-2002, 04:09 PM
from what i understand (so take this with a grain of salt) 285 is as wide as you can go on an IRS car on a 10.5 inch rim. i've heard of 295's rubbing the inside fenderwell.

tires? while of course i agree with everyone about bridgestone 730's or firestone sz50's, best bang for the buck tire i've ever had was the khumo 712. the khumo mx is supposed to be an even better tire, and you'll save some money for mods too...;)

12-31-2002, 04:12 PM
I use the firestone firehawks on my car. I've got the 17x10.5's in the rear. I haven't found any firestone firehawks in a 315/35 so i'm using Brigestone 730's on the rear. (swapping on some BF drag radials (or nitto) 315/35's soon.

12-31-2002, 05:57 PM
I was afraid of the rubbing issue, but I do know of some that have put the Saleen 18x10s on the rear with a 295/35 and didn't have a problem. Of course, those were 01s and since the 99 seems to be an oddball, I figured it wouldn't be so easy for me. :D

Also heard stories about rubbing with only certain brands of tires, since they all don't fit the same. I've been looking at Kumho and KDWs, and even Sumitomo (had them before and the tread pattern is pretty sweet). 17x11s on my Z28 was a simple call but this decision has been a tough one with the IRS. But I wouldn't have it any other way. :D

12-31-2002, 07:13 PM
a 295 on a 10 inch rim may not be an issue, remember the extra .5 inch will make a difference in how the tire sits width-wise.

i've gotten excellent wear out of the khumos. 25k miles and 4 track events and about 35-40% tread on the rear, 20% on the front (didn't rotate properly....:mad: LOL