I had 18" on the z3 and to me i believe thats what they should of been fitted with. 19" are to OTT Some really nice wheels around and you can get a full set of staggered simular to mine with tyres for between 750 and 1000. Bearing in mind the price depends on the make of tyre. Have a look at Rimstyle, they also have a car check and if you are not sure then give them a call very knowledgable and friendly. I have had 3 sets of them now and they have all fit perfectly without the need of spacers or anything