Once all of that mass is spinning, it doesn't want to stop. Once you're up to speed, this will make the car harder to stop, and this helps fuel economy (once you're moving). As you can see, changing the weight goes both ways.

The biggest danger of a manufacturer making lightweight wheels is them bending or breaking. This is probably the main reason OE wheels are heavy (besides cost).

Mirror|rorriM
I've ridden a total of 52 days so far this season
I got to snowboard a total of 45 days in the 06-07 season.
I got to snowboard a total of 58 days in the 05-06 season.
I got to snowboard a total of 139 days in the 04-05 season.
RYAN SMITH ("GOLFRSI" or "BIADesigns") STOLE MY A-PILLAR. DON'T DO BUSINESS WITH THIS FRAUD

RYAN SMITH ("GOLFRSI" or "BIADesigns") STOLE MY A-PILLAR. DON'T DO BUSINESS WITH THIS FRAUD

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