I have Azenis RT615 in the 245\40X18 size and notice the front tires are wearing more on outsides. Meaning, even after 3 days of HPDE sessions, the inside 1" of both front tires are not really hitting the road. The outsides are making contact down to the correct location. Alignment and tire balance are smooth at triple digit speeds.

What makes this wear pattern occur? Can it be fixed to wear evenly without throwing off street \ track performance? If so, how?

I know nothing of castor, camber etc but assume they are part of the answer.

 

you got negative camber

 

your alignment is fine, if you have positive camber and run on the track, usually the tire rolls and eats away the outside of the tire on a turn depending on which direction. My Azenis are almost done on the outside (no tread) but the inside still has a lot of tread so I will probably flip the tires around, it has already been proven that directional tires even if they are flipped the other way are just bad in the rain, in a timed lap it has the same lap times.

 

oh my bad... wear on outside... that's postive.

 

So my options are tire rotation front to back and \ or remounting from side to side?

Or

What happens to performance if the camber is adjusted back towards zero to balance the tire wear?

 

I would make sure you have some good camber on the fronts to conteract the track abuse. (1.0-2.0 negative) This setup will wear the insides a little driving on the street, but it sounds like you've got lots of inside tread left.

You may also want to put a little toe out on the front for quicker steering response. This will also slightly wear the inside of your tire.

With these changes made, you will find your car wants to dart around when driving over unevn pavement, like in the ashphalt grooves made by heavy trucks, but it's going to be really responsive in the corners. Lowering a car with springs usually gives you a little more positive camber and toe out without any adjustment.