Azenis RT 660 missing strips of tread

[NoHaveMSG]

Originally Posted by Lynxis

My experience is that the 660s can take a bit more heat than other tires in it's class. I'm primarily HPDE/lapping and just do autocross when something local is going on but at the very least, they hold up to lapping in comfortably warm weather (28c/82f) without significant fall off.

My impression in autocross on hot days (33c/91f) is that I can feel more grip in later runs as I get more heat into the tires, although perhaps my experience should be taken with a grain of salt given that I was the second slowest twin out of about a dozen at regionals this year, the only slower car was a complete novice while I've done track and autocross casually for the last ~6 or 7 years.

Interesting. Myself and a few other local guys ran the RT660's and had similar experience. They loved them for autoX though. I don't do autox so can't comment on that.

Originally Posted by cmiovino

I'll chime in with my pressures on 225/45/17 660's. 31 front, 26, rear. Car also has a 19mm Perrin FSB on stiff, Sachs dampers, and that's about it.


As far as pressures, the general way I get to a certain pressure setup is to lower the front as low as possible to hit the triangles on the sidewalls. For this tire, that ended up being 31.

The rear is then tweeked to match the balance you want. With only -1.1 degrees of camber up front, 31 is the magic sauce there, but the rears need to be kept lower down at 26. I'm basically right on the triangles there and the car is general is going to push before the rear kicks out hard. I've set them to 28PSI with my co-driver and he immediately notices a difference and asks to lower them 2PSI... even when I didn't tell him I set the to 28.

I'd suspect with more camber up front, I could lower the front into the 28PSI range and the rears probably a bit lower too.

As far as the tire in general after 170+ runs the year, I'm not totally impressed. Price-wise, they're a good value. The wear well, but will heat cycle out near around 125 runs with more than half tread left. After about 150 runs, they really start losing grip. I've had RE-71R's and the drop off is about the same with those.

I had the A052 Yoks last year even on a ~1 degree low camber setup and they wore fine for me. Noticeably more grip and a better balance. I really like these more than the 660's, but they're $230/tire vs $165 in my size. For autox only purposes - if you're doing track too, the 660 is likely the ticket there.

Anything under 33 felt terrible to me but again, I don't autoX.

[andys_garage]

Originally Posted by Lynxis

My experience is that the 660s can take a bit more heat than other tires in it's class. I'm primarily HPDE/lapping and just do autocross when something local is going on but at the very least, they hold up to lapping in comfortably warm weather (28c/82f) without significant fall off.

My impression in autocross on hot days (33c/91f) is that I can feel more grip in later runs as I get more heat into the tires, although perhaps my experience should be taken with a grain of salt given that I was the second slowest twin out of about a dozen at regionals this year, the only slower car was a complete novice while I've done track and autocross casually for the last ~6 or 7 years.

i'll say i had a similar experience at mid-ohio. they had good consistent grip throughout a lapping session, my confidence in them only dropped after ambient temps got to 85+ and a lot of rubber went down from NASA racing in the afternoon of a sunny day.