I just got my first bmx bike a month ago (united supreme su3) and I've had 4 flats already (3 in the last week). This is kinda getting annoying I don't want to have to keep changing or buying inner tubes. Like today I was practicing my bunny hops on flat and I'm about at a foot high. I just changed my rear innertube yesterday and hadn't ridden it yesterday. I started practicing today and then I realized I had a flat!! Annoying af!! Any tips on preventing this crap?!