Quote:
Originally Posted by Donster
OK, is there some rule of thumb that generally takes these factors into account?
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No.
Tires are made out of different compounds, roads are made of different materials. Each has their own coefficient of friction differing from dry to wet. To have a rule of thumb, you would have to know all the variables as mentioned.
The only rule of thumb is, whatever traction you have when dry, there is less when wet.