TPMS

I just put the 507s (not flo thru) on our new 5er. Before ordering the set I emailed with them as the stems that came new were rubber. They said the weight of the sensors would not cause a problem. I had the rig at the tire shop for balancing and asked the cost of having metal stems installed. It was the cost of the stems with only being charged for two dismounts since they only break the bead on one side of the tire/wheel assembly. I went with it for the peace of mind. We are at the half way point of a 3000 mile trip and love the system.