Well I went to check brakes and hubs today ant stumbled on to my tire having cracks in it. So I did what most would do and looked at the other three and they all have cracks/splits on the inside side wall only. Some are just cracked/split but a couple spots have a flap of rubber down to the belt on them. I have never seen one do that let alone all 4. Anyone have any clue as to what might have happened?

2012 truck
305/70/18 Cooper stt pro
Nearly 2 years old and 60k on them with at least 5/16 tread on them

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