Garry,
Sorry to differ from your response, maybe all those miles in the Jag has tainted your memory.
I believe I can support what Michael was saying. As demonstrated by Joe at PUB 2011, I remember:
The steel wheels were in the very low 20's, let' say something like 21 lbs.
The bundts were approximately 15 lbs.
The early '80's aluminum wheels (pressed aluminum) that look like a steel wheels were approximately 10 or 11 lbs.
I weighed my steel and pressed aluminum wheels a year or so ago. I remember figures just like this. I'll have to dig up the data.
And yes Frank Mallory, you can really feel the difference !!. I hadn't heard the 1 lb to 4 lb relationship. My butt agrees with your math.
You really feel the car "spin" up faster any time you lean on the throttle and the front wheels are more free to change direction (less gyroscopic effect).
Once I get my suspension fully sorted I'll be able to appreciate even more from those wheels.