i have the pzeronero all weather AAA tread, and they started wearing real quick as soon as it went past 80degrees, all over the 4 tires/1 formed a bubble, so i replaced them with Kuhmo Ultra High Summer Performance SPTs, plenty sticky, have great water handling for this monsoon season, and are as cheap as hell. I know a bubble is a defect, but to me it just means i ripped it on a hot day and the all weathers couldnt take it. also remember i just had an alignment before summer hit, so that would be ruled out.