In Reply to: Re: How I rotate... posted by Dave M. on January 04, 2001 at 14:13:58:
"As far as tires being directional, many brands (like the Pilots on my M Coupe) are marked as to which direction they are supposed to rotate. If you have tires like this (which I assume from your response that they arent) then it makes your only option for rotation to be front to rear and not diagonal."
The original tires were MXM 225/50-ZR16s. Not marked for rotation direction. But some Pilots are directionally marked.
"The reason for the directionality as I understand it is that the tread is made to pump water outwards when rotating the correct way. If you put it on backwards it would suck water inwards instead which wouldnt be good for traction..."
I agree; Michelin Pilot Sports are V grooved and do this.