Tyre pressures are pretty subjective really - although there are MB reccomendations out there there are also limits set by the tyre manufacturers too. Basically I'm finding that a few psi more than the usual MB suggestion works well with mine at the moment. I have the AMG 17" monoblocks on my C43, currently running them at 36psi rears and 34psi fronts - this seems very good so far. Before I was running 34psi rears and 30psi fronts - that was also ok though I'm finding that I'm preferring the higher pressures. My suggestion - try 34psi rears, 32 front for a couple of weeks, then 34psi all round, then maybe 36 rear and 34 front like I have at the mo if you can be bothered - then just pick whichever one feels better to you. I found turn in better and understeer less with 34psi in the fronts. Just as another example, the W210 E55 with 18" wheels had 36psi all round in some of the tests I read, hence my suggestion to match the pressures front & back for a bit and see how it goes. Hope thats of some help
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