- Tire puncture- tube or tubeless, doesnt matter which since both should then be looked into after a puncture.
- Brake wear/noise/rub- disc or rim, doesnt matter since rub happens with both due to many random factors.
- Rough shifting- usually easy fix, just a cable tension adjustment, but its still a mechanical problem and can sometimes take longer if you need to reset the derailleur position and cable tension due to the FD or RD being bumped too hard.
- Mounting bolt loose/missing- another usually easy fix, assuming you notice it early enough or you have a spare.
- Tent issue- zipper break, seam leak, seam tear, pole snap, etc.


Not all are bike related, but I would view these as the most likely mechanical problems I/others face.