These flat blade screwdrivers and any other occasional tire changing hand tool are definitely better than replacing a 12" rear tire on a Honda XR50R. I pinched the tube and damaged the tire bead a few times until I rubbed some mineral oil on the bead and it worked great. Bigger tires like the 19" aren't too bad, but the oil still helps to lighten them up. I had baby powder (talcum powder) between the tube and the tire from the start, so I can't say much about the effect with and without it .