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Originally Posted by Quickurt
As long as the total diameter of the TIRE and the cross section of the TIRE are no larger, which they are not with corresponding sizes, there is basically no difference between clearance for an 18" or 19" WHEEL. Back spacing needed will be the same for either size. Backspacing is the distance between the mounting face of the hub and the overall back side of the wheel rim. MOST, not always, but MOST of the time, the tire sticks out farther than the wheel.
Clearance issue for the wheel are the backside of the spokes not hitting the face of the caliper, or in the case of SMALLER diameter wheels, the inside of the rim not hitting the caliper on it's outside edge.
Inside face clearance (determined by backspacing) is not hitting the coil spring and not rubbing the inner fender when turned all the way one direction or the other and this is almost always the tire rubbing, not the wheel.
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Understood ... don't forget the e-cable rubbing as well.
I would prefer not to go with spacers if at all possible as I do at times like to take corners a wee bit faster & harder ... Faster is not better and if caught doing 50 km over the limit, car is impounded, lose of licence for 7 days and possible $10,000 fine for "stunt driving" ...hence the mover from a turbo to a bit slower ...