Hello All,

My first post in this section I think. Nothing has happened here for a while and I recently had an opportunity to measure this, so here goes:
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2005 LeSabre 15" x 6.5" factory steel rim weighs 20lb 10oz:

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2005 LeSabre 15" plastic wheel cover with hub cap weighs 1lb 5oz:

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1997 LeSabre 15" x 6.0" factory aluminum rim 21-spoke weighs 17lb 5oz (with hub cap):

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The math:

20lb 10oz + 1lb 5oz = 21lb 15oz (15" steel plus plastic wheel cover)

21lb 15oz - 17lb 5oz = 4lb 10oz (weight loss to go to 21-spoke aluminum rims)

So, 21% unsprung and rotating wheel weight loss by switching from steel to aluminum.

The 15" steel rims were used on most GM FWD 5-lug cars without aluminum rims from at least 1995-2005.

Opinions vary on how much performance, economy, and/or ride improvements would be experienced based on this change, but a 21% reduction in unsprung rotating wheel weight for a car is nothing to shake a stick at.

I just thought a bunch of folks would like to know.