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Hydroplaning, Tires, PSM

Wheels and Tires

Model: C4S, Year:2002, Mileage:38000, Type of use:Street use only
I had an accident last week ... in heavy rain at about 60MPH...My tires are Michelin PS2 235/35ZR19 in front and 295/30ZR19 in rear...I am searching for answers on why this happened and how to avoid it in the future... my questions are: 1) Any general thoughts on what is the cause? 2) Do you expect a C4S to hold the road in heavy rain or at least recover from a hydroplane or is what I experienced typical for heavy rains in a C4S? 3) Could a PSM malfunction contribute to the event? If so what should I ask the dealer to check? 4) Would a C4S hold the road reliably in the rain with new all season tires? 5) Would different tires hold better in the rain, like 225/40-18 front, 295/30-18 (orig spec)? 6) Does the tire size combination (front to back) sound strange? 7) How could an AWD drive car function with tires of different circumferences and could this be a clue? Brian West [SFL]3/16/2010 8:09:23 PMCan you measure the minimum tread depth for me on all 4 tires? Also would like to know the manufacturing date code, it is imprinted on one sidewall of each tire. This is a 2-digit week of the year followed by a 2-digit year. 4502 is a tire made in week 45 of 2002.Joel Reiser [UPC]3/22/2010 2:11:51 PMMr. Reiser:Min tread depth is 3/16" to 4/16" depending on tire or groove for the main grooves. Wear looks pretty even but outer tread grooves are thinner than the main three central grooves. Rear tires date codes are 3704 and 4704, front tires date code is 5004. They are all N1 rated. Wheels are Champion 19x9 front and 19x11 rear. I read about the Lexus SUV getting a "don't buy" rating from Consumer Reports recently for doing the same thing on the test track that my C4S did on the road (it did not recover from a skid on wet pavement - traction control was said to be too slow). Thanks very much for any insight you may offer to help me improve the safety of rain driving in my C4S. PS - I had to show up at the auto body shop and make the measurements above since they have had the car since my original post!!!

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