track rims weigh like 18lbs give or take a few. performance rims weigh 27 give or take a few, Id imagine G35coupe rims to come in at about the same 27lbs+-2lbs.

 

If twelve oclock is 0 degrees then 1 oclock would be negitive on the driver side and 11 oclock would be neg on the pass side. You need some neg to help the tire hold contact with the pavement. Too much pos or neg and then only part of the tire is in contact, inside or out side. Look at a road race car and you can see what neg camber is, the bottom of the tire looks tilted , with the top closer to the frame. Toe in is easy, and caster is like your bicycle forks when you where a kid, if the forks lean away, you get a smoother ride, if you turn them around the steering was very jerky.
Hope that helps explain it a little.
John

 

that was perfect.thanx