I swapped out my ///M wheels for a track event and went ahead and weighed them out...here is the comparison.
Front Stock 18" OEM wheel with 225/45 Michelin PS2 - 49.5lbs
Front ZCP 19" Comp wheel with 245/35 Michelin PS2 - 45.5lbs
Rear Stock 18" OEM wheel with 255/40 Michelin PS2 - 55.0lbs
Rear ZCP 19" Comp Wheel with 285/30 Michelin PS2 - 51.5lbs
Not only is it more tread...but it's also lighter...and you can tell.
Front Stock 18" OEM wheel with 225/45 Michelin PS2 - 49.5lbs
Front ZCP 19" Comp wheel with 245/35 Michelin PS2 - 45.5lbs
Rear Stock 18" OEM wheel with 255/40 Michelin PS2 - 55.0lbs
Rear ZCP 19" Comp Wheel with 285/30 Michelin PS2 - 51.5lbs
Not only is it more tread...but it's also lighter...and you can tell.