What I need is the depth of the drop center and the width of the drop. I am thinking about getting tire pressure monitors. But I just cant convince myself I want to use the fobo cap type. They seem to work well, but they also depress the schrader valve core to read pressure. So if the seal should leak in cap your air leaks. I do suppose the monitors would tell you the pressure is low. But if possible I may be able to source out inside transmitters that would fit in the wheel.