Well I just put them on about 1200 miles ago. I read a bunch of reviews and they were all pretty good. I haven’t heard anything about bad tread life. But I do think that these are way better than the federal 595rsr-rr tires I had before these. The grip is really good for a street tire and the ride is smooth! Hope that helpsHow do you like the ps91? Is the tread life as bad as I hear it is?