Collected my TDV6 RRS 3.0 on Friday, absolutely delighted with it – but one question re tyres, please.

The 4 on the car are 20” diameter with 275/40/20 tyres, but the spare is a 19” with 175/80/19 tyre – the dealer says this is standard as the rolling radius of the spare is very close to that of the main four wheels, but I’d have expected the 5 to be identical.

Anyone actually used a spare akin to this to confirm all is well, please?

Many thanks,
Stuart

Yes, daft as it sounds, that's correct.
On my new MY12 RRS, I have 20" wheels on the car and a 19" wheel spare.

You can if you choose to, buy a similar spare 20" and store it in the same place, instead of the current 19", but it will protrude slightly under the car a little more and change your 'exit angles' should you choose to put it through its paces a little off road.

HTH  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

same here as well Range Rover Vogue ‘17 TDV6

Gone: Range Rover Vogue '11 4.4TDV8, Range Rover Sport ‘59, Range Rover Sport ‘56

Eh? That 80 profile looks wrong to me.

a 175/80 R19 has a diameter 35mm larger than that of a 275/40 R20. Its rolling radius is almost 5% out.

A 175/70 R19 would be an exact match for the rolling radius. RRS 3.0D HSE 11MY - Fuji White, a few extras.

Will check my profile tonight and report back . I know its a 19", but not sure what the others details are  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

Just had a look under mine to save beancounter getting dirty and the 80 profile seems correct
My tyres are 275/40 R20 Contis on the car and a rubbish 175/80 R19 space saver thing underneath.
I keep meaning to treat myself to a full size spare, I wanted one when I ordered the car but was told this is no longer an option, not sure if I beleive that.
If you still want a full size spare Stuart, ebay is a good option. 12MY RRS Orkney Grey HSE Lux
12MY FF Santorini Black VSE

Excellent speedy responses, thank you all – agree with Mr Chesterfield’s view that while the spare wheel and tyre look pretty robust (unlike a spacesaver), the rolling radius appears to be 3.5 cms. too big, so have asked the dealer to clarify – will let you know their view. Presumably the air suspension wouldn’t compensate for one bigger wheel?

Great forum, as good as the RRS !

Stuart

essexfarmer wrote:

Just had a look under mine to save beancounter getting dirty

Thanks EF
Of course, wouldn't have been me getting dirty, oh no, one of the staff dear chap  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

175 80 19. = standard issue for those with 20inch alloy!!

I would have thought the larger rolling radius would have played havoc with the traction control systems as one wheel would have been rotating at a faster rate than the other in all sorts of conditions.

Maybe the pressure or sidewall strength on the spare are lower and allow for more compression, therefore equalling the rolling radius out?

I know after looking at getting a set of winter wheels and tyres, the specification in the handbook shows a differing profile for winter tyres, Im assuming more compression in the rubber counteracts the extra profile height. RRS 3.0D HSE 11MY - Fuji White, a few extras.

That clever stuff is all beyond me but the sidewall of the spare states "INFLATE TO 60 psi"
So perhaps that solves the equation

whippetman wrote:

That clever stuff is all beyond me but the sidewall of the spare states "INFLATE TO 60 psi"
So perhaps that solves the equation

No!
"INFLATE TO 420 K.P.A. (60 PSI)"
Mine is in the cellar and easy to read

Get a wheel protector for your spare otherwise at some point it will go walkies!!!!

Good advice and I have mine on the full size alloy.
C'ant really understand why they nick the space savers unless they sell them to the V.W. van owners??