Will I have to change the alignment when I put on 17"x9.5" wheels with 275/40/17 tires?

Steve

 

No. If you lower the car than yes you will.

 

Thanks Shifty.

Steve

 

No prob. You only need an allignment when you alter the suspension. That can be as simple as changing stock parts or going aftermarket. This is for the front end only of course for our cars. The rear cannot be alligned.

 

My rear can be aligned! Thanks Spohn!

 

If you havn't already done so maybe go to negative camber so that you're expensive new tyres don't wear the outer edges prematurely.

 

How much negative camber is too much? I assume the wider the tire the more -camber is required. But then again I guess that would depend on the wheel offset.

Steve

 

There are some specs posted somewhere. Stock is +1 for my 83 and presumably other years as well which is bad. I think aggresive street is like -.5

I'm running -.7 with 275/40/17s. The car is allways driven hard and used for lap days on road courses as well. I should have more neg on it really but the outside and inside edges are holding up fine wereas previous normal usage with stock specs and 235s caused a lot of outside edge wear.

Check into for yourself but I would think -5 would be a good starting point.

Also, the agressive street settings suggest a lot of caster which I found to be impractical on my car with 275s on the front because of rubbing issues.

 

Thanks for the info George. I have my 86 IROC set to those specs -.5* camber I just didn't know if running the 275/17's would be any differant on my RS.

Steve

 

Yeah -5 degrees here too. 17" 245/45 fronts. Seams to wear a little faster on the inside edge of the tire so each year I rotate left to right. A bit of a drag as they have to come off the wheels but I feel its worth it to get the most out of the pricey rubber.

 

Runnin NEG 1 deg. here. If pos 1 deg. is OK then Neg 1 deg. is better! Besides our cars are known for a positive camber curve during cornering, so a little extra neg will really help through the twisties.