you can actually gain a lil clearance from where it's located in the hub, slacken the pinch bolt and knock the hub downto increase the distance from the centre of the hub to the base of the spring cup. you may on gain a few mm, but sometimes it's enough other than that you have the wrong tyre's or you could get away with with a pair or spacers.

but generally it's caused by incorrect tyre size running 19's doesnt help.