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Old 06.07.2019, 14:08
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Driving on winter tyres in summer

The thread depth of my winter tyres is still well over the legal limit (1.6mm), however not enough for driving on the snow (4-5mm), so was planning to wear them out in summer and replace with fresh winter tyres next winter.

My question is, is this legal in CH? Or could it have insurance implications in case of an accident? Googled around and could not find anything against this, in fact it seems like a fairly common practice but you never know.

Cheers
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Old 06.07.2019, 14:23
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Re: Driving on winter tyres in summer

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The thread depth of my winter tyres is still well over the legal limit (1.6mm), however not enough for driving on the snow (4-5mm), so was planning to wear them out in summer and replace with fresh winter tyres next winter.

My question is, is this legal in CH? Or could it have insurance implications in case of an accident? Googled around and could not find anything against this, in fact it seems like a fairly common practice but you never know.

Cheers
Main impact is significantly longer braking distances in hot weather - ADEC state up to 16m longer from 100 KmH. Whether this would have any influence if that results in you hitting a pedestrian is another question...don't know the answer.

But you do see people doing it.
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Old 06.07.2019, 14:24
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Re: Driving on winter tyres in summer

I think this is quite common practice, although the TCS advise against it for the reasons given here:

Est-il judicieux de finir des pneus d’hiver usés en été ?

Rien ne l'interdit. Mais si un pneu d’hiver a une profondeur de profil inférieure à 4 mm, ses qualités spécifiques pour la conduite hivernale seront péjorées. Pour des raisons de sécurité, il est déconseillé de « finir » ses pneus usés jusqu’à atteindre la limite légale de 1.6 mm.

Des tests du TCS ont montré que, lorsque les températures sont douces et le sol sec, la distance de freinage d’un pur pneu d’hiver comparée à celle d’un pneu d’été est nettement plus longue. Le profil mais aussi la composition du caoutchouc ne sont pas conçus pour des chaussées sèches et pour des températures estivales.
En roulant en été avec des pneus d'hiver, vous vous exposez aux dangers et inconvénients suivants :

Stabilité amoindrie en raison des pains de sculptures plus petits
Vitesse maximale plus basse (moins de profil = danger d'aquaplaning)
Bruit de roulement plus élevé
Plus forte consommation de carburant
Usure plus rapide
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Old 06.07.2019, 15:02
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Re: Driving on winter tyres in summer

Tyres are so cheap here, a set of 295x30x19 cost less than Chf 1'000.-- fitted, a set of 185x60x15 (VW Polo) cost Chf 280.-- fitted.


Why bother dicking around for such small money when it is all their is between you and an accident ?


Sure you can drive on them, no problem, they are legal but it you have a serious accident with people injured, the police come automatically (if a person is injured) and they will rule you are not properly equipped, the fault is yours.


The only worry the police have is to find somebody who is responsible and if it's this easy.....well tough shit.
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Old 06.07.2019, 15:16
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Re: Driving on winter tyres in summer

No problem. Have done it myself.
Like the others have said, stopping distance is greater.
Also I would refrain from doing any long trips on really hot days.
Anything under a couple of hours should be OK.
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Old 06.07.2019, 18:34
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Re: Driving on winter tyres in summer

Perfectly legal.

Tom
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Old 06.07.2019, 19:00
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Re: Driving on winter tyres in summer

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Perfectly legal.
So is driving on summer tyres at -20 on snow and ice in the middle of winter.
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Old 06.07.2019, 19:42
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Re: Driving on winter tyres in summer

Two things I want working well on a car. Brakes and tyres.
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Old 06.07.2019, 21:36
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Re: Driving on winter tyres in summer

Most of our cars are fitted with winter tires.

Except the Boxster, that gets summer tires.

Also, the bikes all have summer tires. Most have race pads as well.

Tom
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