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No spacers on my car, all around stock 18" double 5 spoke AMG rims, they are just chromed. The rear tires were changed to Pirelli Pzero Nero 255/35/R18 instead of the factory Pirelli Pzero Rosso 245/35/R18
The 265's I wrapped around 8.5" wheels are filled to 40 PSI and have no bulge. If you use spacers you will need to get bolts that add the thickness of the spacer.
Even 255s on stock wheels look like they barely fit - there is a good quarter inch of rubber outside the rim. 265 might need a wider rear wheel to fit properly.
2005 Mercedes Benz C55 AMG..1967 Lotus Europa..1987 Lotus Turbo Esprit HCI..2020 Mercedes Benz E350
Guys....
For the last 4 years, I've been running Michelin Pilot Sport 4S 275/38/18's on 9.5" rear wheels with 2 year old OEM springs and Bilstein B6's all around. I needed to roll the inside rear fender arches, Occasionally, I'll hear rubbing rolling over parking lot speed bumps and more noise hitting dips at speed.
Next time, I'm dropping down to 265/35/18's and expect no noise whatsoever in both conditions. Here's a pictures......