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Plazmapete



Member Since: 05 Jun 2016
Location: Cannock
Posts: 118

United Kingdom 2006 Range Rover Sport TDV6 HSE Java Black
Different tyre sizes

I need to replace my 2 front tyres. At the moment they are 275-40-R20
Can I fit 275-45-R20 and leave the rears for a month or so and then change the rears? Or will it not be happy running different sizes. Thanks. New alternator.
Gearbox flush.

Post #520800 Mon Mar 13 2017 6:46pm
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Tyrefitter



Member Since: 19 Jul 2015
Location: Bridlington East Yorkshire
Posts: 3675

United Kingdom 2013 Range Rover Sport SDV6 Autobiography Fuji White

No,,,,they all need to be same size,,if you mix them it will Kn@@@@r your drive train.

Andy Andy.
21 Ford Ranger
Gone but not forgotten
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Post #520802 Mon Mar 13 2017 6:53pm
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Pufftmw



Member Since: 23 May 2012
Location: Carmarthenshire
Posts: 1047

United Kingdom 2007 Range Rover Sport TDV6 HSE Stornoway Grey

Quote:
No,,,,they all need to be same size,,if you mix them it will Kn@@@@r your drive train


Cock... 55 profile on my current set and 50 on the spare, which I've run for 50 miles back from Cambridge last night. Got the puncture fixed, better swap over now.

Post #520807 Mon Mar 13 2017 8:21pm
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DrRob



Member Since: 23 Feb 2011
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Post #520811 Mon Mar 13 2017 8:40pm
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Plazmapete



Member Since: 05 Jun 2016
Location: Cannock
Posts: 118

United Kingdom 2006 Range Rover Sport TDV6 HSE Java Black

Isn't the spare a different size anyway???
When I first got my sport the spare was 19 INCH. New alternator.
Gearbox flush.

Post #520815 Mon Mar 13 2017 8:49pm
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Tyrefitter



Member Since: 19 Jul 2015
Location: Bridlington East Yorkshire
Posts: 3675

United Kingdom 2013 Range Rover Sport SDV6 Autobiography Fuji White

Yes but the rolling circumference of the 19 would have been same as the 20.

Andy. Andy.
21 Ford Ranger
Gone but not forgotten
Focus RS Red Edition
2015 RRS AB Fuji.
2014 RRS SC Santorini
2016 VW Amarok
2014 RRS AB Fuji
2012 RRS Red Edition Fuji
2015 Nissan Navara
2012 RRS SE Santorini
2008 RRS White
2007 RRS Santorino

Post #520817 Mon Mar 13 2017 9:01pm
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grey17



Member Since: 18 Jul 2016
Location: London
Posts: 62

United Kingdom 2009 Range Rover Sport TDV8 HSE Stornoway Grey

Plazmapete wrote:
Isn't the spare a different size anyway???
When I first got my sport the spare was 19 INCH.


Hi mate.

You are quite correct in thinking that the rolling circumferences are different. Have a look on any tyre size comparison site and you'll get all the info you need.
I assume Land Rover tested running the spare 19" on the same axle as a 20" with no ill effects to be happy to market the vehicle so equipped.

The tyres ARE different to varying degrees depending on your set-up.

Best.

G

Post #521103 Thu Mar 16 2017 3:33pm
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