A weight being proprietary? You should have told her that she might as well tell you because you were going to find out either the easy way or the hard way. I wonder what response that would have generated.

iautobodyparts.com thinks that they are 20 lbs each.

http://shop.iautobodyparts.com/37306...loy_wheel.html

Wheel is 16 lbs. and tire is 19 lbs.

If you want some light weight wheels check out the Kosei K1-TS on Tire rack. I have a set of these 15's on my 92 Saturn SC electric conversion and I shaved 8 lbs of rotating wheel per corner. The 15's are 12.6 lbs each! It made a big difference in acceleration power required. They are a bit wider, but the existing tires should fit just fine.