Ive got hold of some genuine rstt's to refurb with two almost new 225 45 18 tyres. Going to get the wheels powdercoated and fit a full set of new rubber. In the meantime I was wondering if I could get away with running the 45 profile tyres on the rear of my current Reps and 225 40 18s that I run on the front? heared it could cause problems with the haldex and rolling radius etc. Anyone shine some light?