BOB Trailer Duallie

I love this stroller, but would want others to know about its major drawback. We purchased this stroller in navy last year. It is very easy to push, with a smooth ride and easy turning (if you want). We also love that you can lock down the front tire if you want to run with it. However, we have had three flat front tires so far. It can be difficult to find and buy the 12.5 inch inner tube the front wheel requires. We have only gone over street and sidewalks with the stroller, so we don't know what to attribute the flat tires to. It seems every time we want to go out for a walk/jog, we find the tire flat again. I would think it is a defect with our stroller, but other BOB owners I have talked to in the neighborhood have complained of the same problem. Maybe it is a problem with this particular design.