I confirmed the distance between the exhaust and tires is the same as with the stock 14" rims. The car rides much tighter with this rim/tire combo.
My tire project was done on the cheap $620 total ($80 for 4 good condition CLK rims on Craigs, $120 for spacers and lugs, $420 for new Contentials and I had the MB logo center caps). I spent a good portion of the afternoon sanding out curb rash from 2 of the rims and taking it to the buffing wheel. Overall, it's the look I was going for.
To Jeffc280sl, I read all about your 15" hubcaps and challenges finding rims. That turned out really great!!!