Have you let them know your not comftable with it, they should do somthing about it like assist you (they might take the piss a little mind, just do it back), the pop is quite loud (but not deafaning) and it makes me jump in college, but its over in a flash, you could keep a pair of ear plugs in your pocket if your realy bothered about it, moving tyres and wheels around ain't too bad, they can roll, if your struggling with lifting them then get help, there not allowed to make you lift somthing that cause injury, good luck with it