With 20k miles on the clock I need to replace the full set - (I could
maybe have stretched this out by swapping the tyres Right to Left as the
left tyres get more use. I guess I am happier pushing harder on a right
hand bend than on a left hand bend.)
The tyres are Michelin Pilot Sport 225/45 ZR17 with an "MO" which
indicates a Mercedes specific tyre. I can't find anything definitive
about whether the MO indicates a different tread pattern (according to
one thread) or whether it is due to a different tyre wall thickness
(local tyre dealer said this might be the case) or whether there is a
difference in the bead seat profile on the MB wheels. There are
different variants of the PS for Audi, Porsche and MB in additional to
the plain vanilla PS or PS2.
Can anyone give a definitive explanation as I am not sure whether to
hold out and wait for some MOs on special order or simply go with the
plain PS2s that the local tyre dealers have in stock.
Thanks Tiger, I was looking for a more specific response really. If the
tyres are 'special' then what's the difference? I suspect that the MO
isn't just an anti theft stamp like they put on government property that
makes it hard for MB staff to refit their vehicles with factory stock.
This is possible though and I expect that there is no major harm in
fitting standard PS tyres but I am curious to know what the difference
is before I discover that the ride or handling aren't quite as smooth as
a 'special' can provide.
I don't know how it work in your country... but tire is tire and shouldn't
make any difference at all. You don't even need to fit the same brand and
model as you have unless you are absolutely happy with it.
You said this set of tire only lasted you 20,000 miles... I would not be
happy with that kind of treadlife.
I got 15,000 miles out of the tires on my 928,
I was slightly dissapointed, but this is the sort of
life you get from truely *sticky* tires
It is a trade off, if I got 50,000 mile tires, I
micht just fly off the road rounding a corner
when i reach the limits of the tires adhesion.
Since the car is much more expensive, I choose
to spend my money replacing tires more often. :)
There is no *operational* difference between them and
the "generic" tires of the same type. The MO designation
is put on them to comply with certain countries unwieldy
regulations requiring all parts of the car to be certified
*together* including the exact tires. (I forget which countries,
but someone should chime in here with them) If your country
has no regulations as far as replacing tires with factory only,
then I would suggest the PS2 pole positions, unbeatable
grip in my experience.
I got some answers from Michelin...
"The 'MO' notation, stated on the tyre sidewall, indicates that the
specific tyre has been fully homologated/accepted by Mercedes, when
tested by the vehicle manufacturer for fitment as original equipment.
Concerning Michelin tread pattern 'Pilot Sport', the included angle on
the 'V' shape of the directional pattern has actually been altered/tuned
(sharper angle) for Mercedes vehicles. "
and fitting advice...
"Ideally full vehicle set of 'Pilot Sport MO'
Ideally full vehicle set of 'New Pilot Sport (PS2)'
Acceptable, although not ideal: Front axle pair 'Pilot Sport MO', with
rear axle pair 'New Pilot Sport (PS2)'"
So, I'll be fitting a set of PS2s at the weekend and making a note of
the mileage so that I can think about rotating them to make them last a
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