Ka-boom! and now the mystery is solved.

A few days ago Olivia and I heard something at the back of our house explode and despite having a good look neither of us could work out what it was, until today.
I noticed a wheel on our cart looked awry, on inspection the tube had exploded, I guess I must have over inflated it a little bit so be warned, the construction of the wheel isn't up to it.
I've ordered a new tube as I don't think I can repair this one, but doubtless there'll be plenty of folk in Philippines vulcanising shops who would leap at fixing this for a few Pesos.