>There are also magnesium alloy wheels. Good point. There are probably quite a few new alloys of various metals being used in the making of modern wheels/rims. That only makes it more difficult to know when those alloys would melt under fire conditions. I suspect some of these modern alloys have quite low melting points since they were designed for use due to their other properties of strength, resilience and weight rather than high heat since the generally will no see high operating temperatures in normal use. I wonder if we could find some burned out tire and wheel shop images that have melted wheels too. That could be an important find that could make the discussion more realistic and accurate.