this season I change to a wider tire 30x12.5x15 I had backhoe front tube in the old tires 29x11x15 they would not flatten out in the new tires so I bough proper hoosier inner tubes they were surpose to fit up to 31x13x15. I had the tube in the right way and backwards but there was always a hallow spot in the sidewall. I tried powder to see if it was sticking but nothing helped, after 4 time switching the tube split along the side I never went over 25psi. hooiser said I had it in backwards. no warranty. anybody got any pointers??