Originally Posted by papap
It's not the stem or extensions that are the problem. It's the hub cap. You can pull it off by hand. Then when it comes off it pulls stems out of rim. Caps need to be bolted to wheel.
I don't think you can know for sure. In my opinion, however, the caps are on as tight as any hubcap I've ever had on a vehicle, and I've never had one fly off in 40 years of driving. Also, I do not see or hear about these types of caps flying off all the time, and there are thousands of them on the road.
So, I don't think its the cap. I do know, however, that the problem has not reoccurred since I took my steps.