Lighter is much, much better. 1 lb of rotational weight is equivelent to I believe 10 lbs of dead weight.. so if you get wheels that are 5 lbs lighter, you've effectively cut 200 lbs off the weight of the car.
The Spickle
New Car: Infra Red '04 FSVT
Former Car: Black '98 CSVT, #3137/6535 "The Unluckiest car.. ever"
