I tend to have a hard time with using the search engine on these forums. I will post my question, but if anyone has a link to previous threads where this was discussed, i would appreciate getting the link or search terms. I need to replace my tires, they are now worn out, i think the last tread was 2/32 on three of them. One of them consistently has 10/32, i replaced one due to road hazard. i got the 2007 Prius in 09 and info on these forums led me to replace the Integrities that were on the car with Good Year Triple Tread Assurance P195 60 R15. i wanted the safest tires for holding the road because i was using the car for work with a lot of driving all over the place, lots of miles, all kinds of conditions. I am not driving the car very much now, i have a different car i'm using for work which i will sell when i retire in a year or so, and will go back to driving the Prius full time but i don't think it will be very much. The tires i got in 2009 are now discontinued, Discount Tires said they are replaced by Assurance Triple Tread A/S which are different and better. Does anyone have any info on this? In spite of replacing the stock tires on my car with the more expensive Assurance Triple tread tires, i experienced hydroplaning for the first time in my life. Are there any tires that would prevent that? No other car i ever drove, same road, same conditions, had hydroplaning, where i was changing lanes even though i was driving straight and narrowly missed the car on my right because they got out of the way, very scary. At one of the two Discount Tires i called today, they said they have Michelin Primacy XV4 which they said was better than the Good Year, costing slightly less, $117. The Assurances are $129. The Michelins have a 60K warranty. The Assurance Triple Treads have 80K warranty. I only put 40K miles on those tires and they need replacing now. I'm hoping Good Year will pro-rate them. Is the warranty meaningless? The guy at one of the Discount Tires said that if the wear was even on the tires, Good Year would probably not pro-rate them. i also have a Life of Tire warranty that extends the warranty on the tires. Is this all meaningless? thanks for any clarity or guidance.