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phminell
Member Since: 26 Mar 2018
Location: paris
Posts: 11
  
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Hello, quick question : Can I put just 2 new tyres in the back, keeping my 2 worn tyres in the front (like 60% worn) ?
Thx! V8 Addict
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 7th Sep 2023 2:31 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8224
  
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Yes! It can when others can't,
It will when others won't,
It goes where others don't.
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| 7th Sep 2023 3:51 pm |
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RRSTDV8
Member Since: 07 Apr 2014
Location: Here
Posts: 13541
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I believe that's the recommended approach anyway as it means the rear has the best wet weather performance and thus less likely to spin the car in the wet. Visiting from rrsport.co.uk
2012 RRS SDV6
2008 RRS TDV8
"When you fire that first shot, no matter how right you feel, you have no idea who's going to die! You don't know who's children are going to scream and burn. How many hearts will be broken. How many lives shattered. How much blood will spill, until everybody does what they were always going to have to do from the very beginning: SIT DOWN AND TALK!"
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| 7th Sep 2023 4:01 pm |
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phminell
Member Since: 26 Mar 2018
Location: paris
Posts: 11
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I'm sorry I have not been precise enough in my question :
I'm not worried about Worn tyres in Front and New in the back, I agree, this is the way to install new tyres.
I'm more worried about the different diameter between new Tyres and Worn Tyres (1 or 2mm), which might cause problems to the central differential because of the different rotation speed of front/rear wheels.
Perhaps this is not significant and I'm worried for nothing... V8 Addict
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| 7th Sep 2023 8:00 pm |
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Maddpuk
Member Since: 25 Aug 2023
Location: Barnard Castle
Posts: 39
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I did think it’s best practice to have matching tyres all round on a 4wd setup, to avoid over working the central diff.
1-2 mm difference would probably be ok, but if fronts are 60% worn surely the delta is nearer 4 mm? 2014 Discovery 4 HSE
2013 Insignia Sports Tourer BiTurbo 4x4 SRi
2004 S2000
Honda FourTrax TRX300
- Paul
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| 7th Sep 2023 8:35 pm |
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LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23823
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I don’t bother to rotate the tyres so the fronts wear a bit faster than the rears.
Therefore, I tend to buy new tyres a pair at a time. Always fit the new pair on the rear, with the ‘old’ rears moved to the front.
So for a few thousand miles I might have a difference of up to 4mm (max) in the tyre tread depths between the two axles. I’ve never experienced any problems as a result.
I do recall the AWD Volvo V70R’s were prone to issues if there was even a small difference in tread depths. 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 (now semi-retired)
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| 7th Sep 2023 9:10 pm |
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Moo
D3 Decade
Member Since: 13 Aug 2010
Location: UK
Posts: 14383
 
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I've always replaced mine as a set of four. 60% worn sounds like too much of a difference. New Defender L663 110 SE (known as Noddy!)
Sold Volvo XC90 R-Design (known as Basil)
Sold - D4 HSE (Known as Gerty)
No longer the Old Buses original owner 
231,000 miles and counting
05 S manual owned from March 2005
D4 Face lifted
Still original injectors and turbo
V8 Front brakes
BAS Remap, Allisport Intercooler and deCat
EGRs blanked
T-Max split charge
Hanibal Expeedition rack
Prospeed ladder
Duratrac tyres
IID BT
BAS FBH control
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| 7th Sep 2023 9:12 pm |
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RRSTDV8
Member Since: 07 Apr 2014
Location: Here
Posts: 13541
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phminell wrote:I'm sorry I have not been precise enough in my question :
I'm not worried about Worn tyres in Front and New in the back, I agree, this is the way to install new tyres.
I'm more worried about the different diameter between new Tyres and Worn Tyres (1 or 2mm), which might cause problems to the central differential because of the different rotation speed of front/rear wheels.
Perhaps this is not significant and I'm worried for nothing...
Not a problem with the D3/D4 as it has an open centre diff most of the time.
On vehicles with viscous coupling centre diffs, running different circumference tyres at each end can lead to premature wear of the coupling. Visiting from rrsport.co.uk
2012 RRS SDV6
2008 RRS TDV8
"When you fire that first shot, no matter how right you feel, you have no idea who's going to die! You don't know who's children are going to scream and burn. How many hearts will be broken. How many lives shattered. How much blood will spill, until everybody does what they were always going to have to do from the very beginning: SIT DOWN AND TALK!"
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| 7th Sep 2023 9:36 pm |
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LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23823
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Moo wrote:I've always replaced mine as a set of four. 60% worn sounds like too much of a difference.
Which is the ideal, but even on a permanent 4X4. you need to do tyre rotation to ensure even wear across all four tyres.
Unless you want to scrap a pair of tyres that still have plenty of life left. 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 (now semi-retired)
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| 7th Sep 2023 10:04 pm |
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