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Eirik34



Member Since: 16 Dec 2014
Location: Norway
Posts: 420

Norway 2007 Range Rover Vogue SE TDV8 Stornoway Grey
Is this OK?

On a trip to Denmark the rear left tyre got damaged (long rift on the inner edge), and it was really difficult to get a replacement of the 275/45 R21 Pirelli Scorpion Verde tyre. I managed to get hold of a new Continental SportContact 6 in the exact same dimension (275/45-21), but afterwards I’ve found out that the circumference isn’t 100% identical to the 3 remaining Pirelli’s.
Is it OK to drive with 3 Pirelli’s and 1 SportContact 6 in the same dimension, but with slightly different circumference?
Or will this cause excessive wear on the center differential?

Post #518357 13th Jun 2019 4:46pm
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stan
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whats the difference in tread depths??

can you fit the spare if its roughly the same as the rest of the road tyres..

Post #518359 13th Jun 2019 4:51pm
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jim4244



Member Since: 31 May 2012
Location: UK
Posts: 843

England 2005 Range Rover Vogue Td6 Zambezi Silver

You should never mix different tyre types on the same axle as each make of tyre has different grip, stopping and breakaway characteristics.

All tyres on the vehicle should be the same size. No arguments, this is a must and you will be breaking the law (in the UK) if you fit a mix of tyre sizes to your car.

I hope that the above clears up your predicament?

Jim

Post #518363 13th Jun 2019 5:34pm
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Alistair



Member Since: 11 Feb 2011
Location: Peterborough / Bordeaux / Andorra
Posts: 7724

United Kingdom 2013 Range Rover Vogue SE SDV8 Santorini Black

There’s no law against mixing tyres - except cross ply and radial and the former no longer exist really.

I agree that all 4 should be the same and never understand people economising with tyres, but many do for their own reasons.

Post #518367 13th Jun 2019 6:06pm
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Eirik34



Member Since: 16 Dec 2014
Location: Norway
Posts: 420

Norway 2007 Range Rover Vogue SE TDV8 Stornoway Grey

The spare is of the original 255/50R20 size, and due to that this is 2.3% less in diameter than the 275/45R21, I haven’t used this spare lately.
The tyre diameter difference between the Pirelli and the SportContact is around 0.8%; the SportContact is 768 mm in diameter, and the rear Pirelli is around 762mm, even if the thread depth on the new Conti is 1mm less than the 2 year old rear Verde (4mm vs 5mm)..

Just to be clear: all tyres are of the same dimensions: 275/45R21, but still the circumstance is slightly different. And yes, I agree that ideally all tyres should be of the identical brand and size, but I would hope to avoid to replace all 4 tyres due to this...

Will the 0.8% difference in circumstance on the rear tyres cause wear on the center diff?


Last edited by Eirik34 on 13th Jun 2019 6:46pm. Edited 4 times in total

Post #518369 13th Jun 2019 6:20pm
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Boxbrownie



Member Since: 19 May 2018
Location: FF gone now....FL2 i6 to play with
Posts: 245

United Kingdom 2008 Range Rover Vogue SE TDV8 Java Black

jim4244 wrote:


All tyres on the vehicle should be the same size. No arguments, this is a must......



Jim


Except that, on the same axle...... otherwise it is perfectly acceptable to have differing sizes front to rear as in a staggered set up. David

Please let me know if my comments upset you, I may wish to upset you again.

Post #518370 13th Jun 2019 6:23pm
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Eirik34



Member Since: 16 Dec 2014
Location: Norway
Posts: 420

Norway 2007 Range Rover Vogue SE TDV8 Stornoway Grey

The rear diff will of course handle a difference in diameter between the two rear tyres, but the question is if the 0.8% difference in circumstance on the rear tyres will cause wear on the center diff? The local workshop claimed that all permanent 4x4 cars need to have the exact same tyre circumstance on both axles to avoid wear or breakage of the center diff. Is this the case for L322 as well?

Post #518372 13th Jun 2019 7:04pm
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CS



Member Since: 14 Apr 2015
Location: Edinburgh
Posts: 1335

Scotland 2017 Range Rover Autobiography 5.0 SC V8 Corris Grey

ownerinfo.landrover.co.uk (the online source for manuals, one can choose Norway too) for the 2017 model year says that tyres should ideally be replaced in sets of four, and if that is not possible then two the same on each axle. The choices available in the UK on that site seem the more recent models, you may of course be able to consult a hard copy manual for your own car.

My understanding is that the more modern cars are a bit more tolerant of minor differences than would have been the case with older technology, but as others have observed it is not ideal. If I were you I'd either get another Conti for the other side of that axle or, if your Pirellis are not much worn, another Pirelli to make a matched set and then when you come to replace the Pirellis buy three Contis and use the one currently on the car (assuming you find their characteristics acceptable).

I would be wary of running your smaller spare wheel for any length of time alongside the 21" wheels/tyyres, just at low speed to the repair shop. Only Range Rovers since 1988

Post #518393 13th Jun 2019 8:12pm
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