So my Honda Shadow VT400 shaft-drive cruiser all of a sudden has a flat on the rear tyre & I was gonna replace it with a tubeless at a tyre shop but figured that it might cost too much & my tyre still has heaps of tread left as it has only went 6500km. How it happened I don't know because I changed the oil & filter on my bike & didn't ride it until two days later only to find out I had this issue. It sucks it had to be the rear wheel because I think I have to take off alot of parts just to get to the thing & possibly the final drive oil might have to be emptied out too. Does anyone know how I can determine if a tube tyre is leaking or not. Ideas, suggestions & recommendations are greatly appreciated.