To add my two cents to this thread. I have a stock 260 2+2 and recently replaced the suspension with springs which lowered the car by approx 25-30mm. After reading this forum and doing some measurements, I landed on a full set of Rota RB 16 x 7 +4mm offset fitted with Re003 225, 50, R16. Am very pleased with the result. Ride is definitely firmer than the last 265 65 R14's that were installed, but the improved responsiveness is a major improvement.
A small chaff on the front rh below bumper area (when turning left) was easily solved by a light touch on the fender to pull outwards. Otherwise clearances all round are healthy.