excessive rear tyre wear

Rotorhead500

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Used to have a C63...
Interesting thread is this. I say this because I've recently bought a 2013 SL350 and the rear tyres are supposed to have 39 psi in them as do the fronts (I think) I thought at the time that this was a bit excessive. The ride is quite firm and they are run flats, which I'm going to change to standard once they wear out. So my question is should I drop the psi and to what level. My previous car was a Jaguar S Type with 18 inch wheels and the pressure recommended was 30 psi but I used to run them about 28/29
Your thoughts please :confused:

The recommended pressures on my C63 were 44 psi when lightly loaded. I was... pretty surprised, as that was the most I'd ever seen on any road car of mine.

Suffice it to say, I tried it... it lasted one day before I went back to usual 34-35 on front and 32-33 on rears. In 4 yrs, never got uneven nor obviously premature tyre wear, just a far better ride, better steering response (at 44, it felt like I was steering on ice), and lower road noise.

I'm pretty certain the intention was purely to coax more friendly fuel consumption figures out of it
 

Bay Leaf

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SL 350 R231 2013
Thanks for that. I might try mine at 32 all round and see how it feels.
 

John Laidlaw

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My SL had 18s and I ran them on 32 with good ride and no problems (36 on winters)
 

Bay Leaf

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Thanks. Yes I thought that might be a happy medium to start with. I'll keep my eye on them to see how they wear. Incidentally when I first got the car I went through it to make sure everything was ok and I noticed that the tyre pressures were well below 39 psi So looking back now I bet the previous owner was running them at a reduced pressure.
 

Bay Leaf

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I'm ashamed to admit this but I was reading the wrong wheels / tyres size inside the fuel cap. They should be 30 psi rear and 32 front. :eek:
 

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