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Wheels, Tyres, Brakes & Suspension Discuss all wheel related matters

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Old 19-11-2016, 09:08 PM   #1
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MO Tyres

Friend of mine has been told by a tyre fitter that unless a tyre (on a Mercedes)has an MO rating then it may invalidate the cars insurance.

Any truth in this?
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Old 19-11-2016, 09:13 PM   #2
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Would be interesting to see if the Hankooks etc. that are now Factory fitted are MO spec or if that is just the domain of the premium tyre companies.
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Old 19-11-2016, 09:15 PM   #3
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No truth whatsoever
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Old 19-11-2016, 09:30 PM   #4
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Nope, as long as they are of a size and rating which is fitted as standard and have the correct EU approval markings then they will be fine.

Last edited by 400ixl; 19-11-2016 at 09:54 PM.
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Old 19-11-2016, 09:33 PM   #5
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Mercedes Original (MO) tyres are 100% optional. No insurance implications whatsoever.

The size and rating of the tyre must of course be as per the owners manual, otherwise the insurer must be notified regarding any deviation from the original specifications.

But MO is not an issue.
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Old 19-11-2016, 09:33 PM   #6
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Tyre fitters are not the brightest of people,,
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Old 19-11-2016, 09:51 PM   #7
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Much discussion as to whether MO tyres are in any way different to their non MO equivalent. One suggestion was that they had a slightly more compliant tyre compound mix to give a quieter ride at the expense of wear- I somehow doubt it. There are certainly no insurance implications provided they are to the same speed/load rating.
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Old 19-11-2016, 10:18 PM   #8
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The only difference I'm confident of is MO tyres are selected from those that comply with much tighter QC limits. As advised by Michelin tyre development manager.
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Old 19-11-2016, 10:26 PM   #9
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Well it is MOvember?

I'll get my coat.
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Old 19-11-2016, 11:03 PM   #10
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My own experience with manufacturer-approved tyres (not just Mercedes) is that they all seem to have the exact same colour rings in the same location.... while non-approved tyres seem to come with coloured rings all over the place.

This is based on two sets of manufacturer-approved tyres and two sets of non-approved tyres, so admittedly it is not 100% conclusive (ie it may have been a coincidence), but it's enough to make me believe that this is most probably the case.

The importance of having the coloured rings in the same location is that one of these rings is crucial to ensure there is no tyre drift at the front (pulling to one side).

There may be other differences but none that I could notice.
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Old 22-11-2016, 11:29 PM   #11
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Quote:
Originally Posted by LTD View Post
Would be interesting to see if the Hankooks etc. that are now Factory fitted are MO spec or if that is just the domain of the premium tyre companies.
My GLC came with factory fitted Yokohama tyres.

Blackcircles lists them in a MO variation (they're 235/60 R18 103V).
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Old 22-11-2016, 11:45 PM   #12
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MO = Muppet's Opinion
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Old 23-11-2016, 12:13 AM   #13
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I contacted my insurer Aviva about upping the rears from 285 to 295, due to more availability and being a bit of a poseur, and they said they weren't interested in tyres for insurance purposes.
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Old 23-11-2016, 01:52 AM   #14
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Quote:
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I contacted my insurer Aviva about upping the rears from 285 to 295, due to more availability and being a bit of a poseur, and they said they weren't interested in tyres for insurance purposes.
Presumably following the backlash over increased premiums for winter tyres, they are now (sensibly) looking only at different/larger wheels but not tyres...

On a related note, the need to notify the insurer regarding modification is one thing, but the driver is still responsible for ensuring that the vehicle is safe and roadworthy at all times. The fact that the insurer is not interested in tyres does not give drivers a carte blanche to fit whatever tyres they wish... in the event of a claim, having incorrect tyres fitted to the vehicle can in principle be used by the insurer to avoid pay-out if they can convince that the car was unsafe or not roadworthy (though they will probably require something more substantial than an increase from 285 to 295).

Last edited by markjay; 23-11-2016 at 01:54 AM.
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Old 23-11-2016, 07:25 AM   #15
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As long as load and speed ratings are still as stipulated by the manufacturer and the tyre size to rim width is within the tyre manufacturer's specifications......
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