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

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

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?

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

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

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

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

Cheers
Col

Good to hear thanks Col

Ive got some 22's for sale.
https://www.rrsport.co.uk/forum/topic56210.html 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

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

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

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 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
MY2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

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

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.

I agree, Wayne. Kev

MY2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
MY2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey