Hubcaps kept flying off the Matrix. The dealer blamed my driving (!) but I've never had this problem with other vehicles. After spending over $400 to replace the first five I lost, I went to Walmart (which I usually avoid, but I was desperate...) and bought a set of 4 for under $20. They've stayed on much better than the factory/dealer hubcaps, but still sometimes fall off. I saw another Matrix where the driver had used plastic zip ties to hold theirs on, so I'm now doing the same and (knock wood!) so far it's working.