Hello All,
I am currently running my winter set up and the size is the same as the
OEM set up being 275/40/20 on 9.5Jx20

I am looking to get a new set of 22" wheels,
as I made a mess of two of the ones I have,
but my question is this,
I have been running 285/35/22
but surely to keep the correct aspect ratio it should be 295/30/22

Is there a reason everyone runs 285/35/22?
and does that mean the speedo is always 4% out
30mph really being 28.8mpg

Can they be adjusted with the IID tool to correct the speedo??
if so I will possibly increase the side wall to 285/40/22 ===========================================
2012 Range Rover Sport Autobiography 3.0 SDV6 8 speed Automatic
Indus Silver with Hockenheim premium two-tone leather Ebony/Lunar,

I think you may find 285/30 x 20" is actually the closest to the 275/40 x 20", and no it will not make a blind bit of difference to the speedo reading that you will notice by changing the tyre size in the ccf files, however the 285/35 would proably make the actual speedo reading more accurate than the orginal 275/40 as I'm sure by law a speedo has to read fast by a certain percentage, or at least that used to be the case. If you are talking about winter tyres I would have though smaller dia. rims with higher profile tyres would be the better option, as 22" rims were never a factory option on the L320 in either case.

Cheers
Col

When I had my L320 on 22’s I was running 285/35r22 & the actual Speed was slightly lower.



[/b] 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

When I fitted my 22" wheels I had 285/35/22 and the speedo was under, I now have 285/40/22 and the ride is better by a long shot and the speedo is about perfect to my GPS.

Great info guys, thank you all very much.. ===========================================
2012 Range Rover Sport Autobiography 3.0 SDV6 8 speed Automatic
Indus Silver with Hockenheim premium two-tone leather Ebony/Lunar,

Hi all,
Just to update,
I am running 285/40/22 Summer Tyres.
Do not put in access when parking
Speedo is spot on, tested with several apps..
Comfort is so much better with the current state of the roads,


I am running 275/40/20 Winter Tyres.
Much easier to get in and out of in the cold

Not sure what the future holds as with the mild winters in the S/E
once the Winters wear out I may just get rid, probably 2-3 years
left still though... ===========================================
2012 Range Rover Sport Autobiography 3.0 SDV6 8 speed Automatic
Indus Silver with Hockenheim premium two-tone leather Ebony/Lunar,

There is a great free app that I am using, called "Tire Expert". It allows you to compare any tyre sizes and tells you the difference between them