Reedy

A052 are better for Ax. I’m pretty sure they were specifically designed for it due to their rapid heat up.
AD09 is slower but handles heat better without dropping off.

beez

that could be, but I don't know what pressures they were running, just noticed the relatively expensive carnage. I'm a pro instructor/racing coach, so that's my concern with the Bridgestones.

If you wouldn't mind reporting back after your track event with them, I'd appreciate the feedback!

beez

Unfortunately, the CS-doesn't come in the sizes I need, and I live in Las Vegas and run at Spring Mountain, but also Big Willow, Thunderhill, Buttonwillow, Laguna, Sonoma, etc., so not sure the Bridgestones will like the heat. That's pretty much why I'm going to try the AD09s first, and see how they do. I'm using SC2s now, so obviously I'm not looking for the ultimate lap time. I think the other manufacturers have made strides the last few years in their compounds, while Michelin hasn't commensurately updated the SC2 compounds since they came out in 2014/2015. So hoping the AD09s are stickier.

0-Day

Like Reedy said, for stock 20" wheels, you want the Yoko A052 for autoX. They are incredible in cold temps. The A052 DON'T like being hot at all. They need to be sprayed with water in between every run on a 80+ deg day. The rears are especially needing water spray to keep them cool because they are a half inch away from a 700 degree GPF on the exhaust. Shutting the engine off between runs helps keep rear temps under control too.

Tigers10

As an advanced/instructor driver I've been happy with the RE71RS. That's after using the Goodyear Supercar 3 which I loved for longevity.
My last set of RE-71RS I got 4 weekends/~35 sessions out of them (usually 20 min).
My current set I have 2 weekends/20 sessions at a pretty abrasive track and the tires still look pretty healthy.

I try to target a hot pressure of 32.

Reedy

I’ve been very happy with the AD09’s. They wiped the floor with my Cup 2 lap time and are more durable, also quite a bit cheaper.


I’ve posted this before but since it’s a new thread for a new year I’ll re link my comparison that I made when I first tried them.

My longer term review is much the same. However one criticism that I have is that when they start to wear, they tend to develop a lot of high speed vibration that the Michelins don’t seem to suffer. 260kph at Bathurst brought it out in them pretty quickly.

I want to try A052 next for a speed comparison but there is plenty of data to know they are a faster tyre over a single lap, but then tend to overheat.

For track days or racing the AD09 is the one to have
For AX, time attack or tarmac rallies the A052 is the better option

beez

Great information, thank you! I haven't bought the Yokos yet, there's still some meat on the SC2s, so this is making reconsider the Bridgestones.

What tracks have you used them on, and what are the ambient temps like?

Your video is what got me thinking about the AD09s in the first place. Having a longer view is also very helpful, thank you. A few other people I've talked have similar views of them. Do you think the vibration has something to do with the tread pattern?

Reedy

I think it is yea, the wavy grooves collect pickup unevenly, perhaps some resonance in the tyre construction at certain speeds. They have quite a low speed rating for this type of tyre as well. I haven't tried having them re balanced either, that might help.

People report the same thing with AR-1's as well and the workshop that does track support for some of us believes its tread pattern related in both cases.

Sean in Texas

I am an advanced/instructor group driver and I had no issues with them. As was pointed out, I too had better results with lower pressures.

enduro

The RE71RSs are putting down very very good times at my track, on par with SC3R for the GT4, like 1.5s/min faster than I've seen with Cup2. It's not a big track and doesn't have super high friction, so this will matter, but I will say that they appear to be handling heat much better than did the RE71R. Guys are running hard for 10+ laps on them.

85Gold

71RS benefits, really needs a true heat cycle, with 24 hour rest cycle. They are prone to tearing up the center rib especially if over driven when new. I had over 25 HC on my last pair. 2023 1Lap 3500 miles and Sebring twice, Road Atlanta TT, Roebling and The Firm. The only time they were really unhappy was Sebring in July and mid 90 degree weather.

Peter

ExMB

Same pressures to start out with? I know the Cup 2s tend to heat up and increase pressures a lot toward the end of a 15 min session. How did the AD09s do?

beez

Cool, thanks for the info!

beez

This is excellent stuff... thanks to all of you!

Reedy

Pressure growth behaviour is mostly the same as the Cup 2's. They do slightly better with lower starting pressures than the Cup2's do so you can start with them a bit lower. As long as you're prepared to deal with TPMS warnings.