Epigram
Top Poster
The tyre size calculator in Webbah’s post above ( on tiresize.com) is a very useful reference tool for anyone wanting to investigate different rim/tyre combinations. There are still clearance and load hurdles to cross!
The diameter difference between 225/45/18 OEM on an MP Sport and 245/45/19 OEM on an AMG in Wheel Size Category 2 is about 3.5%. Therefore it is reasonable to assume a change in diameter within this percentage for an alternative wheel/tyre combination won’t upset the electronic control units.
I would expect anything more than this would not be considered acceptable by MB.
It would be interesting to know what diameter MB has set for accurate speedometer /odometer readings in each tyre/wheelsize category .
The diameter difference between 225/45/18 OEM on an MP Sport and 245/45/19 OEM on an AMG in Wheel Size Category 2 is about 3.5%. Therefore it is reasonable to assume a change in diameter within this percentage for an alternative wheel/tyre combination won’t upset the electronic control units.
I would expect anything more than this would not be considered acceptable by MB.
It would be interesting to know what diameter MB has set for accurate speedometer /odometer readings in each tyre/wheelsize category .