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Old 07.09.2021, 19:57
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(urgent) MFK needed for new alloys?

I am looking for winter tyres for my car and spotted some brand new winter tyres on alloys (official manufacturer) for a very good price. Seller wants to meet up now.

However the alloy wheel is a different size to my current ones. Will this require a new MFK?
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Old 07.09.2021, 20:10
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Re: (urgent) MFK needed for new alloys?

Check the instruction manual of your car. This should indicate which wheel/tyre combinations are allowed. Or search it on google.
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Old 07.09.2021, 20:10
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Re: (urgent) MFK needed for new alloys?

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However the alloy wheel is a different size to my current ones. Will this require a new MFK?
No.
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Old 07.09.2021, 20:13
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Re: (urgent) MFK needed for new alloys?

Don't think so.

A car model is homologated for more than 1 wheel/tire size. If you have an 18 in wheel now, quite probably there's a 16in wheel size compatible for winter. Just search online which wheel and tire sizes are compatible with your car.

In my car there's a sticker on the driver door frame indicating the recommended air pressures for the compatible wheel/tire sizes. Lots of cars have this too, it may save you the online search.

Finally, most of people understand what 245/40R18 means. But one overlooked measurement is the offset. A wheel/tire combo of the same size you have installed today, but with different offset, may rub the mudguards or make the steering feel like crap. Some crazy people use spacers to fix offset, don't do this https://www.lesschwab.com/article/wh...el-offset.html

PS. A past thread on homologated/non-homologated wheels https://www.englishforum.ch/transpor...es-wheels.html

Last edited by Axa; 07.09.2021 at 20:26. Reason: added the PS
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Old 19.10.2021, 23:57
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Re: (urgent) MFK needed for new alloys?

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Some crazy people use spacers to fix offset, don't do this[/url]
Why not, it's a perfectly valid solution.

Tom
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Old 20.10.2021, 00:20
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Re: (urgent) MFK needed for new alloys?

Not a new MFK but should come with a certificate to cover them short term. They will need to be officially shown at a testing station before or latest during the next MFK, if you wait until the actual inspection the inspection of the new rims must be additionally booked. BTDT about a year ago.

This assumes you do the MFK with the new rims!
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