Quick update now that I've had the AD09s for about 3 months and done a few autocross events. I think the AD09s excel as a streetable 200tw tire. They ride well for this class of tire, gives good steering feel, and has really good dry grip.
I haven't tried the RE71RS yet, but I don't think it's quite at that level of dry grip (maybe 5% less). The AD09s are also surprisingly good in wet weather.
If you only have one set of wheels and want a "do it all" 200TW tire, the AD09s tick a lot of boxes. If you're purely looking for an autocross tire or track tire, there are probably better options.
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