Its a ballon in the form of a circle..
so you didn't get the tube while you were in the store ? oh you called on the phone..
do you know the difference between a 700c wheel and a 27" one?
math: 27 aka 630... is just 8mm bigger where the rim meets the bead . 622 for 700c
tire fit matters, tube doesn't. get the right width 1.25" is darned close to 32mm,,