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Tyre Tread Depth on All Terrain - When to change?
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MintyHit
 


Member Since: 25 Jul 2017
Location: Bradford on Avon
Posts: 227

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3
Tyre Tread Depth on All Terrain - When to change?

Hi All.

My Pirelli AT+ tyres are now down to about 4.5 - 5mm.

I noticed when taking it out in the snow and ice my traction and breaking distances seemed pretty poor compared to when the tyres were new.

For those of you who run ATs... when do you usually change them?

I assume a big drop off in winter performance is to be expected.


  
Post #231848313th Dec 2022 1:31 pm
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Captain Crosscheck
 


Member Since: 03 Sep 2021
Location: Oslo
Posts: 302

Ukraine 2008 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

How old are they? I never run winter tyres more than four, five tops, seasons as the rubber hardens. Tread or no tread, I find that age is just as big a factor after driving 20+ seasons on snow.
  
Post #231861414th Dec 2022 12:21 pm
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qcnr
 


Member Since: 23 Nov 2017
Location: Norway
Posts: 102

Norway 

Minimum tread depth is 1.6mm for summer or 3mm for winter.
I would change them now, they are after all the only things that keep your car attached to the road.
  
Post #231862714th Dec 2022 2:00 pm
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LT
 


Member Since: 31 Dec 2005
Location: South West
Posts: 23244

United Kingdom 2016 Discovery 4 3.0 TDV6 Landmark LE Auto Santorini BlackDiscovery 4

Approx. 3mm is the point when I change.

If it’s in the summer I might go a little lower, but always by 2.5mm

Pirelli ATR’s were still performing well at that level. If they hadn’t been, I’d have changed them sooner.

Currently running GG AT3’s and anticipate they’ll need to be changed earlier from what I’ve read.

As has been said , tyres and brakes, never skimp. Thumbs Up
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Post #231863214th Dec 2022 3:06 pm
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MintyHit
 


Member Since: 25 Jul 2017
Location: Bradford on Avon
Posts: 227

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

Captain Crosscheck wrote:
How old are they? I never run winter tyres more than four, five tops, seasons as the rubber hardens. Tread or no tread, I find that age is just as big a factor after driving 20+ seasons on snow.


Excellent point!

I put them on summer 2017 and they have done at least a score of trips.

I think best change them out a bit early based on helpful comments.

Thanks all!
  
Post #231873814th Dec 2022 8:07 pm
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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 used to replace mine at 4mm. I took the view that anything less and you lost the advantage of the tread. Mind you I would still see over 30,000 miles out of them.
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Post #231879115th Dec 2022 8:00 am
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RRSTDV8
 


Member Since: 07 Apr 2014
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United Kingdom 

The AT+, like the Grabber AT3, are winter rated. Winter tyres are recommended to be changed at 4mm of remaining tread depth in order to maintain winter performance. They have a 4mm wear marker for this reason.

As Moo says, taking an AT down to the legal limit means you lose the benefit of the blockier tread when off road.

When my rear dampers are replaced next week, it's my intention to fit new tyres. I was thinking of fitting a fresh set of AT+ but Pirelli have done their usual thing of deciding to not supply 255/55/19 to the UK. Whilst they can still be found here and there, the risk of not being able to find some should I need a new tyre e.g. a non-repairable puncture, means I'll likely go back to the GG AT3.
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Post #231880315th Dec 2022 9:14 am
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grizzlymac
 


Member Since: 01 May 2010
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Scotland 2015 Discovery 4 3.0 SDV6 HSE Auto Montalcino RedDiscovery 4

I just put on new duratrac a month or so back and noticed huge difference when hitting standing water. Still probably years life left if taken down to legal limit but not worth going that. Did just over 55k on them
With all this crazy weather and the state of our roads I'd say change sonner rather than later.
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Post #232608410th Feb 2023 12:45 am
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Coo
 


Member Since: 01 Jun 2015
Location: Fife, Scotland
Posts: 284

Scotland 2005 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

When they start to slide, you start to lose confidence...
Time to change !
  
Post #232609510th Feb 2023 8:42 am
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
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England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

If the recommendation for winter tyres is 4mm what is the recommendation for normal road tyres in winter?
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Post #232611010th Feb 2023 11:17 am
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LT
 


Member Since: 31 Dec 2005
Location: South West
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United Kingdom 2016 Discovery 4 3.0 TDV6 Landmark LE Auto Santorini BlackDiscovery 4

The legal limit is as stated above (1.6mm ?). However, most people would agree that it is prudent to replace them before then.

Exactly when is down to the individual and also how the tyres are performing.

As per my previous post, I typically change when the tread is around 3mm. I definitely never go below 2.5mm
 2006 D3 HSE (Original & still the best)-GONE
2010 D4 HSE (A bit bling)-GONE
2014 D4 HSE (Almost too bling)-GONE
2015 D4 HSE (A heated what?)-GONE
2016 D4 Landmark (Written Off)-GONE
2016 D4 Landmark (Surely the last!) PD1881 rims-GONE
2017 FFRR SDV8 Autobiography 
 
Post #232613810th Feb 2023 2:57 pm
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