i have 175 60 13's on mine, nankangs like franks, mine were £35 fitted and ballanced, the lowest i have seen is 175 50 13, as i think frank also said, im not sure if there are lower profiles than that, but i could only get that size in a ''performance'' tyre and they jumped from £35 a corner to about £65-70 a corner so i took the decision and stuck with the 175 60 13