While on the subject of new tubes and advice, I like to mark my new tube with a pernament pen near the valve. I mark a star symbol on one side of the tube either the right side or the left side but not both. Then I also place a marking on the tire near the valve but only on the right sidewall (the gear side). Here's why, the next time you change tube, install the tube so that the marking is on the right side of the bike where the gears are. The next time you have a flat, you can pull out both the tire and tube. Inflate the tube to find leak. Then line up the two marking on the tube and tire and now you can see where the object has penetrated the tire.