There was just a slight interference with the spokes on the caliper in a couple different spots. I think with a thin spacer on the front, they would fit just fine. And even then, the wheel still rotates, it just makes a little noise as the spoke passes over the caliper. If you drove on it, something would end up clearancing itself and the noise would go away. Or just get a 3mm spacer. It might also be just the casting marks on the caliper that were rubbing. Some time with a grinder "might" take care of that. Or just get a 3mm spacer.
The offset of the Protege wheels are 50mm. The Speed3 wheels have an offset of 52.5mm.
So if anyone is looking to keep that Mazda look while rocking cheaper winter tires (when compared to 18" sizes) and more sidewall (not the tires pictured), then this option is available.
Here's a guy in Seattle with 16" steelies on his Speed3:
http://www.themazdaforum.com/showthread.php?t=6400

