No real help or answer but what I do know for sure is the Signature wheels are sweet. To give some perspective, my wife, who would normally drive a car with black steel wheels and not care, told me a few days ago, *I don*t care what model or color it just better have those wheels! If anything, I wish the dark wheels were darker yet.
Yeah, the signature wheels appear to be done in Hyper Silver over the standard ones used on the GT. I just wanted pictures comparing the two although I understand pics don't do the Signature wheels justice.
The best way to find out would be to speak to your local Mazda dealerships (they may have a wheel in their current stock that they can weigh for you), or by contacting Mazda Canada. When I asked the Service/Parts counter about the weight of the OEM 20" wheels on the CX-9, they contacted Mazda Canada for the information and relayed it back to me.