Originally Posted by woodcraft

This has been studied, with the finding that basically helmet foam does not appreciably degrade

& 20 year old helmets test fine.

AFAS trailers, it's mostly wheel bearings and not tires that break down, and mostly boat trailers


https://asmedigitalcollection.asme.o...dFrom=fulltext


https://link.springer.com/epdf/10.10...z7MGB63zA_VQ==