I just fixed up an old mountain bike for my girlfriend. The tires on it were super dry rotted and when she rode around they made an awful "squeaking/crinkling" sound with every rotation. It sounded almost like sitting on a very old mattress. Anyway, I had some newer/nicer spare tires in the shed. I threw them on and she went for a test ride. The newer tires make the exact same squeaking. It's super irritating.