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The old rule of thumb I learned from an engineer is simple.
The square root of your tire pressure times 10 is the speed you would hydroplane if the water is deeper than the tread.
The easiest one to calculate is 36 PSI Square root is 6 multiply bt 10 and bingo 60 MPH.
That is one reason big 18 wheel simis with tires running 90 PSI can blast bast you in the rain.
It is not a hard and fast rule but a good guide. If it is raining much at all I slow down to 55 maximum.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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