It really depends on the design of the rims especially the spokes. I have +33 at the front and it didn't clear the calipers. Had to put in a real thin spacer. 2-3mm to clear them. The rears are usually not a problem.
This is a DIY to Prevent thieves from making off with your Car. Since Car Theft is a Problem in Malaysia, This is a Sure way to confuse Criminals who prefer getting in and out...