We in the EUC (electric unicycle) community can sing you a sad song a bout that. Sooo many wheels, (by different manufacturers too) have caught fire lately and riders are really worried. Look up "Kingsong S20 fire NYC" on youtube to see what that can look like. It could easily kill several people if it were to go off in a car on the freeway or in a crowded subway train. That thing turned into a frigging flamethrower.