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Tread depths and snow
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mack1979
 


Member Since: 01 Dec 2008
Location: Buckinghamshire
Posts: 70

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4
Tread depths and snow

I have the stand fitment pirelli scorpion M&S on 20". Never had a problem at home or in the Alps uphill but coming down a local today the hdc was the only thing that stopped me crashing. I was barely moving and the car just turned sideways. It takes a lot of restraint as you nearly crash to not brake and let the hdc sort it out.

Anyway, I have 5mm+ on all 4 tyres and this journey has shaken me up. I know many countries require a legal min of 4mm and in the UK on summer tyres I would change them at 3mm for a legal limit of 1.6mm. Am I just at the point they need changing out are these tyres just that bad in snow. Never been a problem uphill but it's a damn heavy car.

Obviously I'm sure this will also spark the usual debate on proper winter tyres which I'm also willing to consider but am thinking of changing the car next year so might not get a lot of wear and at about £1000 a set it's a big investment.
  
Post #188882110th Dec 2017 11:21 pm
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markate
 


Member Since: 17 Sep 2011
Location: England
Posts: 702

2016 Discovery 4 3.0 SDV6 HSE Auto Aintree GreenDiscovery 4

I'd say at 5mm you're getting close to the point where they start to become less effective in snow. The 4mm limit in most of Europe is just that a limit and most will consider changing before they reach 4mm.
Also consider how old your current tyres are as they start to degrade over time and when they reach about 5 years should probably be discarded.
  
Post #188885111th Dec 2017 8:21 am
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Moo
D3 Decade 


Member Since: 13 Aug 2010
Location: Wiltshire
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Ukraine 2005 Discovery 3 TDV6 S Manual Zambezi SilverDiscovery 3

I always change my tyres at 4mm. Currently have 19inch Duratracs on which I find excellent. Thumbs Up
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Post #188885611th Dec 2017 8:40 am
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72740

Ukraine 

On SWMBO's Conti winters there are 2 sets of tread depth raised bits, one at about 4mm & one at "normal" depth. As I understand it the reasoning for changing winters at a higher remaining depth isn't the tread depth itself but the depth of the sips. Deeper the sips the better the deck shoe effect. I think it was Ken that said here words to the effect that sips are king. Thumbs Up
   
Post #188885711th Dec 2017 8:44 am
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4398

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

I run Scorpions in the summer, but I change to winter tyres as soon as the the roads become permanently wet and muddy.

Tyres also harden up as they get older, regardless of the tread depth. Winter tyres have a softer compound rubber, which works more effectively at temperatures less than 7°C.

Get some winter tyres on before you dont manage to stop the car! Thumbs Up
 Richard


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Post #188885911th Dec 2017 8:45 am
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J@mes
 


Member Since: 10 Nov 2008
Location: Bomber County
Posts: 4544

England 2014 Discovery 4 3.0 SDV6 XS Auto Corris GreyDiscovery 4

There's plenty of used sets of winters about, including on this forum.

Buy a set with alloys, and then when you change cars sell them on again. You won't lose a great deal I expect.
  
Post #188886411th Dec 2017 8:53 am
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Washwipe
 


Member Since: 19 Apr 2013
Location: Bucks Oxon Herts Border
Posts: 3169

England 

Even with winter tyres they say at 4mm they are past their best, so Scorpions at 5mm, I wouldn’t.
  
Post #188911011th Dec 2017 6:16 pm
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Mole734
 


Member Since: 12 Aug 2016
Location: Derbyshire
Posts: 161

United Kingdom 2005 Discovery 3 TDV6 S Manual Java BlackDiscovery 3

Proper winter tyres have 2 tread depth indicators one at 4mm and one at 1.6mm

  
Post #188912311th Dec 2017 6:32 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
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Ukraine 

That sounds familiar!! Laughing
   
Post #188912511th Dec 2017 6:37 pm
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Mole734
 


Member Since: 12 Aug 2016
Location: Derbyshire
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United Kingdom 2005 Discovery 3 TDV6 S Manual Java BlackDiscovery 3

Whoops didn't see your earlier post!
  
Post #188912811th Dec 2017 6:39 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72740

Ukraine 

No problem, good to see my thoughts were vaguely correct. Thumbs Up
   
Post #188912911th Dec 2017 6:41 pm
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