It seems to be just off the top center and toward the road edge, not road middle side of the bike but that is kinda a guess as I only have two tubes to look at and really only payed close attention today. The problem seems to happen as soon as I put pressure on the tire as it will hold air over night and only slowly go flat as I ride. I ride on debris filled roads but that really hasnt been a problem since I have ridden on this bike since April and have put 1200 miles on it. I have increased bike time lately getting up now to the 200 miles per week mark in the last few months. I pretty much want to rule out the rim and if you guys think that I dont have rim issues I want to just buy a new tire and see if that helps.