rexneffect
Ready to race!
I suspect everyone here is gti / r but I'm on 15x6" GSW stock wheels and thinking about better tjres for stock class autox, run only on event day. Wheel width keeps me at around 195-205 tire width.
There are some max perf summer tires in 195-205 with 50 aspect (Falken Azena, RS-4s, Re-71). Diameter is around 23" compared to stock 25" and load rating is 85-87...
First thought is those will be too small diameter wise, but you'd pick up some pep. You can go wider due to tall sidewalls and you'll want some stiff sidewalls for the same reason. Azenis 615x are ok, dunlop z2, re71r, with the 71r wearing 2x faster than the other two. If you need to be 2% faster, get the 71r. If you want the tires to last twice as long, get the star specs or others. Hankook sidewall is reportedly softer. I'd think 215 or 225/50 or 55 are doable, especially if mostly just for auto-x. I started with 225/50 16 tires on my 6.5" wide stock wrx wheels in '02