30mm lowering will be absolutly fine with the 235/60/17; Mine is 20mm lowered and there is still plenty of room.Hi Chris, quick one, do you foresee any issues with lowering 30mm (got a quote from local dealer to do this and keep warranty) and using the 25mm H&R spacers, on 215/60/17 tyres? I will eventually get the 235 Nokians when I need to replace the current Conti's...
I think (maybe) you could go 50mm lowered and still be OK, but personally thats not for me.