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Eaters



Member Since: 11 Apr 2016
Location: East Sussex
Posts: 877

United Kingdom 2008 Range Rover Sport TDV8 HSE Zermatt Silver
Mixing 40 profile and 45 profile?

Can I run 275 45 R20's on the rear and 275 40 R20 on the front? I guess not as it will screw up something.

Currently have 275 40 R20 all round but would like to change to 45 profile for a bit more comfort. However front only went on 8000 miles ago so still have quite a bit of life in them. Robin
2008 Range Rover Sport TDV8
Awaiting rebuild: NGTF
Gone:
Jaguar S-Type V8 4.2 Sport
MGZTT 190 2.5

Post #551180 Tue Mar 13 2018 9:22am
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Buckster



Member Since: 05 Mar 2015
Location: Hampshire
Posts: 1299

England 2013 Range Rover Sport SDV6 HSE Orkney Grey

Not recommended mate 2003 BMW M5 - 5 Litres of V8 Optimax Slurping Goodness in Carbon Black

2013 SDV6 HSE Black Edition- Orkney Grey with Ebony & Ivory. LR Facelift RAI, Genuine G4 Expedition Rack, 4x Warn SBD-160 Spotlights, Warn 9.5XPS Winch, Mantec Underbody Protection, Full Easy Lift Suspension Module, LR Light Guards, 19"s on Goodyear Duratracs, ARB fridge, TuffTrek awning 😎

Post #551183 Tue Mar 13 2018 10:04am
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Eaters



Member Since: 11 Apr 2016
Location: East Sussex
Posts: 877

United Kingdom 2008 Range Rover Sport TDV8 HSE Zermatt Silver

Cheers Buckster. I thought as much but worth asking Thumbs Up Robin
2008 Range Rover Sport TDV8
Awaiting rebuild: NGTF
Gone:
Jaguar S-Type V8 4.2 Sport
MGZTT 190 2.5

Post #551186 Tue Mar 13 2018 10:15am
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Cymruambyth



Member Since: 27 Feb 2017
Location: North Wales
Posts: 1316

Wales 2006 Range Rover Sport Supercharged HST Zermatt Silver

You`d be increasing the diameter of only 2 wheels then.

It`ll look something like this Laughing


 Steve.


2006 Zermatt Silver, Range Rover Sport HST 4.2 Supercharged.

Post #551195 Tue Mar 13 2018 12:13pm
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jzive



Member Since: 23 Feb 2014
Location: Essex
Posts: 54

England 

Agreed, would advise against mixing profiles.

Post #551204 Tue Mar 13 2018 1:23pm
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Eaters



Member Since: 11 Apr 2016
Location: East Sussex
Posts: 877

United Kingdom 2008 Range Rover Sport TDV8 HSE Zermatt Silver

Cymruambyth wrote:
You`d be increasing the diameter of only 2 wheels then.

It`ll look something like this Laughing




Rolling with laughter Robin
2008 Range Rover Sport TDV8
Awaiting rebuild: NGTF
Gone:
Jaguar S-Type V8 4.2 Sport
MGZTT 190 2.5

Post #551206 Tue Mar 13 2018 1:36pm
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Scrumpy



Member Since: 11 Nov 2016
Location: London
Posts: 330

United Kingdom 2005 Range Rover Sport Supercharged Java Black

Rolling with laughter Rolling with laughter Rolling with laughter Rolling with laughter --------------------------------------------------------------------------------------------------------

If we all point our RR's in the same direction and accelerate at the same time can we turn back time?

Post #551209 Tue Mar 13 2018 2:50pm
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Socast



Member Since: 25 Sep 2014
Location: Somerset
Posts: 586

United Kingdom 2006 Range Rover Sport Supercharged Santorini Black

http://www.rrsport.co.uk/forum/topic35871.html

Mixed wheel sizes cause headaches Thumbs Up

Post #551210 Tue Mar 13 2018 2:53pm
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riverblanche



Member Since: 11 Jun 2011
Location: Retford'ish
Posts: 539

United Kingdom 

Put a decent pair of part worn tyres on to match the others Robin

Then change all four next time for the other size your after Thumbs Up Corris HSE Dynamic 2016

Always pick up stick in the middle !!

Post #551263 Tue Mar 13 2018 9:40pm
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Eaters



Member Since: 11 Apr 2016
Location: East Sussex
Posts: 877

United Kingdom 2008 Range Rover Sport TDV8 HSE Zermatt Silver

Now there’s a thought. Thumbs Up Thumbs Up Robin
2008 Range Rover Sport TDV8
Awaiting rebuild: NGTF
Gone:
Jaguar S-Type V8 4.2 Sport
MGZTT 190 2.5

Post #551288 Wed Mar 14 2018 12:06am
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RallyXS



Member Since: 07 Oct 2016
Location: Devon
Posts: 82

United Kingdom 

Yes, you can. A lot of BMW's have wider wheels on the back, and therefore have a different profile. Eg, you would have say a 305/45 on the rear. You would need to work out exactly which on a calculator. The 40 just means 40% of the width. 2012 RRS SDV6
2014 BMW 320d X-Drive Touring
1999 VW Polo stage rally car

Post #551299 Wed Mar 14 2018 8:46am
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Col



Member Since: 02 Sep 2012
Location: Hawkes Bay NZ
Posts: 1895

New Zealand 2013 Range Rover Sport Supercharged Autobiography Santorini Black

Yes, you can. A lot of BMW's have wider wheels on the back, and therefore have a different profile. Eg, you would have say a 305/45 on the rear. You would need to work out exactly which on a calculator. The 40 just means 40% of the width.

If my calculations are correct, if you run a 275/40 x 20 tyre on the front you would need to run a 245/45 x 20 on the rear to get almost the same rolling radius. 275/40 x 20 is 228.71cm a 245/45 x 20 is 228.87cm not sure I would want to put a 245 tyre on a 9.5J rim. and run it on a 2.5 ton Sport. Also kind of defeats what Robin is trying to achieve surely.

Cheers
Col

Post #551305 Wed Mar 14 2018 9:58am
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RallyXS



Member Since: 07 Oct 2016
Location: Devon
Posts: 82

United Kingdom 

Agreed, no-one suggested putting a 245 on a 9.5j rim from what I can see. I just said it can be done. 2012 RRS SDV6
2014 BMW 320d X-Drive Touring
1999 VW Polo stage rally car

Post #551307 Wed Mar 14 2018 10:08am
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Cymruambyth



Member Since: 27 Feb 2017
Location: North Wales
Posts: 1316

Wales 2006 Range Rover Sport Supercharged HST Zermatt Silver

RallyXS wrote:
Yes, you can. A lot of BMW's have wider wheels on the back, and therefore have a different profile. Eg, you would have say a 305/45 on the rear. You would need to work out exactly which on a calculator. The 40 just means 40% of the width.


The 40/45 is the profile (height), not the width though. The staggered setup on the likes of M3`s won`t affect the overall circumference just because the rears are wider. Steve.


2006 Zermatt Silver, Range Rover Sport HST 4.2 Supercharged.

Post #551318 Wed Mar 14 2018 10:50am
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RRSTDV8



Member Since: 13 Aug 2011
Location: Northamptonshire
Posts: 6008

United Kingdom 2008 Range Rover Sport TDV8 HSE Stornoway Grey

RallyXS wrote:
Yes, you can. A lot of BMW's have wider wheels on the back, and therefore have a different profile. Eg, you would have say a 305/45 on the rear. You would need to work out exactly which on a calculator. The 40 just means 40% of the width.

The BMW are designed with this odd tyre arrangement from the outset, however. The RRS is designed to run the same all round.

Just because you can, doesn't mean you should. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Post #551327 Wed Mar 14 2018 11:23am
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