SO i just got a new wheelset and tires. Velocity Deep Vs and Schwalbe marathon 700x35 tires. Ive ridden on them for a whole week at work no problem and the other day i wake up to a flat rear tire. The puncture in the tube is on the side facing the rim. I patched the whole pumped it up put the wheel back on my bike and 5 seconds go by and a hear psssssss of air coming out and it goes flat. Removed the tire and tube to check it out and there's another puncture just like in in a different spot on the tube. I patch a second hole and check the rim for any defects the rim strip was slightly off center from the valve whole so i straightened it out. I went for a 40 ride on this bike yesterday and when i woke up this morning the tire was flat again! If it is the rim/tire combination why hasnt this happened on my front which is the same as the rear? Can someone provide some insight about why this keeps happening.