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R44dgf



Member Since: 25 Jul 2017
Location: Much Hadham Sg10 6hg
Posts: 30

United Kingdom 
275/45/20” GGAT3s

Just fitted a set of these on my 2012RRSSDV6 any suggestions on tyre pressures normal loading most of the time thanks in advance

Post #537262 Wed Oct 04 2017 1:07pm
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RRSTDV8



Member Since: 12 Aug 2011
Location: Northamptonshire
Posts: 5416

United Kingdom 2008 Range Rover Sport TDV8 HSE Stornoway Grey

Normal book pressures, I would suggest. 2012 SDV6
2008 TDV8 - it's a labour of love

Post #537293 Wed Oct 04 2017 4:14pm
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R44dgf



Member Since: 25 Jul 2017
Location: Much Hadham Sg10 6hg
Posts: 30

United Kingdom 
Tyres

Thanks didn’t know if they was standard fitment

Post #537295 Wed Oct 04 2017 4:17pm
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RRSTDV8



Member Since: 12 Aug 2011
Location: Northamptonshire
Posts: 5416

United Kingdom 2008 Range Rover Sport TDV8 HSE Stornoway Grey

They're not standard size but if you start with LR's pressures you can easily adjust them slightly to counter any adverse wear or other issues. At least you know you're starting from a reasonable pressure. 2012 SDV6
2008 TDV8 - it's a labour of love

Post #537306 Wed Oct 04 2017 5:03pm
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geoffsnook



Member Since: 19 Nov 2016
Location: cardiff
Posts: 650

Wales 2005 Range Rover Sport Supercharged HSE Java Black

So do you need to tell the car it has a larger diameter wheel/tyre diameter Thumbs Up

Post #537354 Wed Oct 04 2017 8:24pm
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Johnski



Member Since: 02 Sep 2015
Location: North Wales & North Yorkshire
Posts: 1373

Wales 2012 Range Rover Sport SDV6 HSE Lux Sumatra Black

You can adjust using a Gap IID BT Tool, (ensure you do backup) but I found the difference so small not worth bothering with to be honest.
Generally......If you have a separate sat nav that shows MPH try it before changing from 275/40/20 Tyres, then again with new Tyres fitted and you can decide for yourself. John

RRS MY12 SDV6 HSE. Sumatra Black/Ebony & Walnut + Dynamic Pack, + Cold Climate Pack + Memory Pack, Digital TV/DVD, Premium Leather, Cornering Lights, Cooler/Fridge Box, & most Options.

Post #537360 Wed Oct 04 2017 9:21pm
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geoffsnook



Member Since: 19 Nov 2016
Location: cardiff
Posts: 650

Wales 2005 Range Rover Sport Supercharged HSE Java Black

Thanks tried it today the speedo set 70 the cruise said 68 and sat nav said 72 so if you could let Mel ow where to find it on the iid I would be grateful Thumbs Up

Post #537363 Wed Oct 04 2017 9:32pm
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Col



Member Since: 02 Sep 2012
Location: Hawkes Bay NZ
Posts: 1450

New Zealand 2013 Range Rover Sport Supercharged Autobiography Santorini Black

The difference at 30mph would be about 1mph which would probably actually make the speedo more accurate, as John said not worth bothering with, even on mine with 275/45 x 21 the variation is minimal.

Cheers
Col

Post #537366 Wed Oct 04 2017 9:55pm
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geoffsnook



Member Since: 19 Nov 2016
Location: cardiff
Posts: 650

Wales 2005 Range Rover Sport Supercharged HSE Java Black

Thanks C||ol but my speedo was not reading as quick as i was actually going saying 70 and sat nav saying 72 so i could be in danger of getting a ticket so if its possible i would like to see Thumbs Up

Post #537435 Thu Oct 05 2017 2:36pm
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