Originally Posted by
woodcraft
I think the point was to compare the performance of smooth and knobby tread tires, and showed little penalty using the knobby ones- all-road, right?
I don't know. Did they test smooth tires on smooth vs rough surfaces or knobby tires on rough surfaces? Or only Knobbie + Smooth roads. FWIW, their conclusions are about the same anyway as Silca's from about 2 years ago (ie. chart below). I'd love to see something like the below with another 6 or 9 plotted lines for different tire types though.
