Wheel/Tire size computer found, is it correct?

infernosg · 03-10-2016, 08:11 AM

I've seen 17x8 +35 and 17x9 +35 called the "ideal" front and rear wheel dimensions and I've seen a few examples in person. Based on that I'd think your 18x8 +35 optons would be okay. I guess the only concern would be the extra 1" diameter since the springs get larger in diameter.

Even though I have adjustable coilovers, I can share my experience. My old wheels were 16x8 +32 with 225/50R16 tires. I had two issues: the inside sidewall rubbed one of the coilover lock collars and the outside sidewall would catch the lip on the inside of the fender. To get around these I used a camber bolts to rotate the hub away from the coilover and ran about -1.5 degrees of negative camber to get away from the fender, which still had to be rolled. Had I run a 17x8 +35 I don't think I'd have run into either of these problems.

03-10-2016, 08:11 AM	#2
infernosg IT'S ALIVE! Join Date: Dec 2009 Location: Richmond, VA Posts: 811 Rep Power: 16	I've seen 17x8 +35 and 17x9 +35 called the "ideal" front and rear wheel dimensions and I've seen a few examples in person. Based on that I'd think your 18x8 +35 optons would be okay. I guess the only concern would be the extra 1" diameter since the springs get larger in diameter. Even though I have adjustable coilovers, I can share my experience. My old wheels were 16x8 +32 with 225/50R16 tires. I had two issues: the inside sidewall rubbed one of the coilover lock collars and the outside sidewall would catch the lip on the inside of the fender. To get around these I used a camber bolts to rotate the hub away from the coilover and ran about -1.5 degrees of negative camber to get away from the fender, which still had to be rolled. Had I run a 17x8 +35 I don't think I'd have run into either of these problems. __________________ '86 Mazda RX-7 Base '79 Mazda RX-7 GS