For street: 15, 16, 17, 18 wheels with 225 or 245 tires is all that's needed. 15 and 16 are more proportional for looks (my opinion).
For autocross and track: 15, 16, 17(?) wheels with 245 to 275 tires. I like a square set, but you might find that a staggered set better for this venue. (?) It's your bank account for experimenting. It's your preference on looks and choices of wheel and tires. limits are bolt patterns and availability of size.
My Stalker did perfectly fine with a square set, 245 size for doing FTD's. I'm at around 1750 pounds and front heavy. I did go to the same tire as
@JBINTX AR 10x15 the last year, but it was not necessary to maintain a great feel or times. Although it made the margin of FTD a bit more. I ran/run a 500 spring front with 250 rear.
When my sons began driving I was on 285 front and 175 rear with Falken Azena 615 tires. 225x15. I told the boys, when you beat the Zo6 I will begin upgrades. But first you have to learn the car and control it.
My Lotus Europa (mid engine) is on 175,13 (right try to find replacements) Has 115 springs front and 75 rear at 1500 pound car. That was right for it in 1971. Autocross dedicated those wouldn't work competitively, but again, my son was within 2 seconds of the Stalker. Go figure!!
Now I understand the younger folks desire for bigger - wider, but please don't carry it to extremes.
Big tire companies and car manufactures have spent billions on designing, engineering, development and research. Lotus, Toyota Mr2, Porsche 914 though Cayman, Acura NSX, some other French cars, plus the high end folks Lamborghini, Ferrari, Audi and beyond.
Lonny has given you valuable information with references. Lonny probably recommended
Another thing is just going to a higher grip tire doesn't necessarily get you to where you think you want to be. You have to have the correct (or near correct) suspension setup. It all works together. You pick a spring, but forget the tire is also a spring -- so did you pick the right combination?
@ Justin Reed -- probably has the most experience in track focused setting -- what is his advise?
Others have some autocross experience now -- what is their advise?
At the meet ups we've had, there are skinny tires, wide tires different wheel sizes. All seemed to do okay on the spirited drives. Maybe the pace was to slow? I know, speed limits enforced - a good thing. Street driving is not for racer type driving anyway.
Just opinion from an outsider looking in!!
Dale
These tires are on my Stalker and are three years old now. They have a few autocross runs, drives in the Georgia, Carolina, Tennessee roads and tail of the dragon. They have been to 3 seven/Goblin meetups.
Toe is 1/16 - 1/8, camber .5ish, 20 pounds street and 24 - 26 pounds autocross. I don't know how you all Goblin folks are wearing out tires so quickly! Just an old guy still trying to learn!