So I go buy a new tube today to go with my new 110/90-19 rear tire. When I get home I notice that the box is marked 100/90-19. So I called the shop back and they said don't worry about it and that the 100/90 tube would be just fine in a 110/90 tire. What say ye of TT? Should I go ahead and use it, or should I go back (on Monday) and exchange it?