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JAMES-SURREY



Member Since: 26 May 2020
Location: KT14 7EJ
Posts: 5

United Kingdom 
21" L405 Wheels on a L320 RRS?

Hi everyone.

I apologise if this has been covered before.

I'm looking to change the Alloys / Tyres on my Supercharged 2010 RRS.

I have considered most options and I want to fill the arches / have a bigger look alloy than my Present 20" Alloys with 275/40/20's.

22" Rims with 285/35/22 are not an option as I don't want a harsher ride & there is much coverage of 22" cracking / requiring welding because of the lower profile tyre.

I'm seriously considering OEM L405 21" Diamond Face Alloys and fitting new 275/40/21's or as a cheaper option buying second hand OEM Rim/Tyre set with already fitted 275/45/21's or OEM L405 22" Rim/Tyre set with .40 profiles.

They are also 9.5J and the Offset is only slightly different at 49mm rather than standard 53mm.

The Standard Fit 275/40/20's give a 728mm Running Diameter.

The 275/40/21's will give a 3% increase in running Diameter
The 275/45/21's will give a 7% increase in running Diameter
The 285/35/22 will give a 4% increase in running Diameter.
The 275/40/22's will give a 6.8 % increase in running Diameter

I know on here some people have ran with 275/45/20's (3% increase in running Diameter).

I know the increase in Rim Dia/Tyre Increase Diameter and weight will affect braking efficiency.

Any body had experience with 21's with .45 Profiles or 22's with .40 Profile please and/or running Diameter Delta's from Standard?


Last edited by JAMES-SURREY on Tue May 26 2020 3:41pm. Edited 1 time in total

Post #599299 Tue May 26 2020 8:55am
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Col



Member Since: 02 Sep 2012
Location: Hawkes Bay NZ
Posts: 3315

New Zealand 2013 Range Rover Sport Supercharged Autobiography Santorini Black

I have been running 275/45 x 21" SVR wheels and tyres on my MY13 S/C L320 for nearly 5 years now and have had absolutely no issues with the brakes or anything else whatsoever. The speedo is spot on and the ride fine, the offset is no issue either. Oh and welcome to the forum. Can I ask how you deduced there would be a 7% reduction in braking efficiency?

Cheers
Col

Post #599302 Tue May 26 2020 9:27am
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JAMES-SURREY



Member Since: 26 May 2020
Location: KT14 7EJ
Posts: 5

United Kingdom 

That's much appreciated Col. Thank you.

I was also considering the 21" 'Satin SVR' wheels - May I ask if you have a picture of them fitted on your L320?

Post #599303 Tue May 26 2020 9:34am
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Col



Member Since: 02 Sep 2012
Location: Hawkes Bay NZ
Posts: 3315

New Zealand 2013 Range Rover Sport Supercharged Autobiography Santorini Black

The SVR rims I have fitted are the old original diamond cut 21" style wheels that were on the first cars, hence why they are nearly 5 years old now. Don't have many pictures I'm afraid.

Click image to enlarge


Cheers
Col

Post #599306 Tue May 26 2020 9:52am
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JAMES-SURREY



Member Since: 26 May 2020
Location: KT14 7EJ
Posts: 5

United Kingdom 

Col wrote:
I have been running 275/45 x 21" SVR wheels and tyres on my MY13 S/C L320 for nearly 5 years now and have had absolutely no issues with the brakes or anything else whatsoever. The speedo is spot on and the ride fine, the offset is no issue either. Oh and welcome to the forum. Can I ask how you deduced there would be a 7% reduction in braking efficiency?

Cheers
Col


Sorry yes in answer.

If the Radius is 7% larger you have a 7% longer moment of fulcrum/Road contact dimension that the brakes are trying to stop.
Also heavier the wheel the higher Inertia of the spinning wheel that the brakes are trying to counteract.

Interesting read here if you ever want some bed time reading:

https://beefedupbrakes.com/blog/heavier-wh...-distance/

Post #599307 Tue May 26 2020 9:55am
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JAMES-SURREY



Member Since: 26 May 2020
Location: KT14 7EJ
Posts: 5

United Kingdom 

Col wrote:
The SVR rims I have fitted are the old original diamond cut 21" style wheels that were on the first cars, hence why they are nearly 5 years old now. Don't have many pictures I'm afraid.

Click image to enlarge


Cheers
Col


Thank you - I must say it looks 'right' for the arch

Post #599308 Tue May 26 2020 10:00am
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Col



Member Since: 02 Sep 2012
Location: Hawkes Bay NZ
Posts: 3315

New Zealand 2013 Range Rover Sport Supercharged Autobiography Santorini Black

I think I'll give the read a miss and just put my faith in the six pot brembos thank's. Laughing never had any problems so far.

Cheers
Col

Post #599309 Tue May 26 2020 10:12am
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JAMES-SURREY



Member Since: 26 May 2020
Location: KT14 7EJ
Posts: 5

United Kingdom 

Good to hear thanks Col

Post #599310 Tue May 26 2020 10:27am
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Tyrefitter



Member Since: 19 Jul 2015
Location: Bridlington East Yorkshire
Posts: 3460

United Kingdom 2013 Range Rover Sport SDV6 Autobiography Fuji White

Ive got some 22's for sale.
https://www.rrsport.co.uk/forum/topic56210.html Andy.
Now
Focus RS Red Edition
2015 RRS AB Fuji.
Before
2014 RRS SC Santorini
2014 RRS AB Fuji
2012 RRS Red Edition Fuji
2012 RRS SE Santorini
2008 RRS White
2007 RRS Santorino

Post #599311 Tue May 26 2020 11:57am
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Dave B



Member Since: 10 Oct 2019
Location: Bramber, West Sussex
Posts: 185

United Kingdom 2010 Range Rover Sport TDV8 HSE Santorini Black

I had to decide which to fit to mine, both 245/45x21", the first in Sparkle Silver

or these from an SVR in Satin Polish

Click image to enlarge


I chose the former in the end, but have a set of each for sale if you're interested, both delivery mileage only.

Dave 2010 3.6 TDV8 HSE
2011 SDV6 Discovery 4 Commercial

Previous LR Product
1980 OBLIC 4.0ltr Range Rover

Post #599318 Tue May 26 2020 6:57pm
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Julio



Member Since: 24 Jul 2020
Location: Mere
Posts: 8

England 2007 Range Rover Sport TDV8 HSE Zermatt Silver

Hi all,
very much on the same point, I have 20" 275/40/20 knackered wheels and tyres on my 2007 TDV8.
I have an opportunity to by a set of 21' with 275/45/21LR alloys with half used tyres from a 2015 Autobiog. Will there be any problems with fitting or running ?
Thanks in advance

Post #602597 Sat Aug 01 2020 8:01am
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knwatkins



Member Since: 09 Sep 2018
Location: Poole, Dorset
Posts: 1001

United Kingdom 2010 Range Rover Sport 3.0 TDV6 HSE Stornoway Grey

I have 255/55/20 which are 787mm diameter. 275/45/21 are 780mm diameter so no problems there. The width however is 20mm greater. As above, Col has been running the same size so it appears you'll be fine.

Just bear in mind that your car wasn't designed for wheels larger than 20". People have reported vibrations when going larger, especially if the vehicle has not been fitted with a damped steering rack. From personal experience, I have had issues with vibrations at >70mph but this was purely down to wheel balancing. I had to take it to 3 different places until it was done right. Yes, I'm very fussy but likewise, I also think my car is fussy about wheel balancing too! Kev

MY2014 RR Vogue SE 4.4 SDV8 in Corris Grey
MY2010 RRS HSE 3.0 TDV6 in Stornoway Grey

Post #602599 Sat Aug 01 2020 8:39am
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Julio



Member Since: 24 Jul 2020
Location: Mere
Posts: 8

England 2007 Range Rover Sport TDV8 HSE Zermatt Silver

Cheers Kev, appreciate your advice.
Just spotted another set on this site, with better tyres. Just dropped him a line, fingers crossed ...

Post #602605 Sat Aug 01 2020 9:46am
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RRSTDV8



Member Since: 12 Aug 2011
Location: Northamptonshire
Posts: 7280

United Kingdom 2012 Range Rover Sport SDV6 HSE Orkney Grey

knwatkins wrote:


Just bear in mind that your car wasn't designed for wheels larger than 20". People have reported vibrations when going larger, especially if the vehicle has not been fitted with a damped steering rack.

Any vehicle that came with 20 inch as standard has the damped steering, and all later models have it fitted too. So any SC or TDV8 will have the damped steering rack anyway. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Post #602633 Sun Aug 02 2020 7:38am
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knwatkins



Member Since: 09 Sep 2018
Location: Poole, Dorset
Posts: 1001

United Kingdom 2010 Range Rover Sport 3.0 TDV6 HSE Stornoway Grey

I agree, Wayne. Kev

MY2014 RR Vogue SE 4.4 SDV8 in Corris Grey
MY2010 RRS HSE 3.0 TDV6 in Stornoway Grey

Post #602636 Sun Aug 02 2020 7:52am
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