CE750

I just upped my CDI from the stock 16" wheels (OEM) to the 17" (OEM) wheels from the E500... the tire went from a 225/55R16 to a 245/45R17...

Do I need to adjust my tire pressure differently? The gas door has a set of numbers, are those still valid?

Also, is there a minus to running slightly higher PSI? I've got 42psi all around..

Jkw

I would think there would be a difference, my door sticker says 28 front(225/45-17), 32 back (245/40-17).
I believe 5psi over is better than 2psi under, 42 sounds high.
Jkw

CE750

Your car is a C? That would explain the different tire pressure... I think the E's are 29PSI.. I'm going to bump them down to 35psi, since I prefer a firmer feel.

Luke@tirerack

MB recommended pressures are based on the cars' weight .... stick with what the sticker says

x15jq

if your car is lowered with lots of negative camber, will a higher pressure help prevent the inner tire wear by pushing more of the center tread section out?

CE750

Thanks, I'll take that to the bank.

Quick follow up.... if the sticker says 29psi, and I run say... 35... will that cause pre-mature wear in the middle of the tire, or is that only if the pressure is way higher? I tend to like how it drives when they're firmer, but don't want to do it at the risk of damage to the tires.