I was told the chainstay of a Specialized Enduro was not covered under their 5 year frame warranty, as they class it as a suspension component, despite even their technical description listing it as part of the frame.

Yeah. Pretty frustrating. I’ve had similar experiences with other companies. It’s unfortunate the experiences aren’t more uniform.

Trek replaced a hardtail xc mtb frame that cracked at the bottom bracket/chainstay interface with the next model up in the series. Was quite a painless process with the dealer.