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Home > Wheels & Tyres > 275/50/20 Tyres

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Mani

Member Since: 18 Jun 2016
Location: Uxbridge
Posts: 298

2008 Range Rover Sport TDV8 HSE Stornoway Grey

275/50/20 Tyres

Hi Chaps,

if I was to fit 275/50/20 on my 2008 L320 RRS would I have to re-calibrate the the ECU so the speedo reads the correct speed
and if so how many MPH would it differ by?

S&F

Mani G MY08 RR SPORT3.6TD V8 FULLY LOADED, COOLER BOX, GVIF UNIT, PIONEER AVIC-F980DAB HEAD UNIT, RETAINING 4X4 INFO OEM SCREEN AND TS-WX130DA SUB
REAR 9 INCH TOUCH SCREEN HEADREST TV SCREENS, WIRELESS HEADRESTS, IN-CAR WIFI MIRROR BOX FOR WATCHING INTERNET TVIE BBC I-PLAYER ETC... FROM ANDROID, WINDOWS AND IOS PHONES ON THE GO ON ALL SCREENS

Tue Feb 18 2020 3:13pm

aaronjb

Member Since: 26 Jun 2019
Location: Northampton
Posts: 447

I went to 274/45R20 and the speedo is now only 2mph or so out, much closer than it was.. you might be lucky and find 275/50R20 is bob-on, depending on the tyre.. 2014 BMW 530d Touring, 2006 BMW 650i, 2018 Mini Cooper S

Tue Feb 18 2020 3:34pm

Mani

Member Since: 18 Jun 2016
Location: Uxbridge
Posts: 298

Thanks Pal

Thanks, Pal
has it made the ride more comfortable? MY08 RR SPORT3.6TD V8 FULLY LOADED, COOLER BOX, GVIF UNIT, PIONEER AVIC-F980DAB HEAD UNIT, RETAINING 4X4 INFO OEM SCREEN AND TS-WX130DA SUB
REAR 9 INCH TOUCH SCREEN HEADREST TV SCREENS, WIRELESS HEADRESTS, IN-CAR WIFI MIRROR BOX FOR WATCHING INTERNET TVIE BBC I-PLAYER ETC... FROM ANDROID, WINDOWS AND IOS PHONES ON THE GO ON ALL SCREENS

Tue Feb 18 2020 4:00pm

aaronjb

Member Since: 26 Jun 2019
Location: Northampton
Posts: 447

Yep I think it has - only a 5% bump in profile but I also switched to Grabber AT3s and the ride is much more pleasant now. Maybe a little less suitable for chucking into corners (as a friend found out when he took us out for a spin - I thought we were going to end up in a hedge when he attempted to make it change direction like his Gallardo ), and no extra road noise that I can tell really. 2014 BMW 530d Touring, 2006 BMW 650i, 2018 Mini Cooper S

Tue Feb 18 2020 4:23pm

Col

Member Since: 02 Sep 2012
Location: Hawkes Bay NZ
Posts: 4843

2013 Range Rover Sport Supercharged Autobiography Santorini Black

Re: 275/50/20 Tyres

Mani wrote:
Hi Chaps,

if I was to fit 275/50/20 on my 2008 L320 RRS would I have to re-calibrate the the ECU so the speedo reads the correct speed
and if so how many MPH would it differ by?

S&F

Mani G

I fitted 275/45 x 21" wheels and tyres a few years back which according to a couple of tyre size calculation websites is 2mm smaller overall diameter 781mm as opposed to 783mm for the 275/50 x 20. We have a lot of those road side digital cameras here and also outside schools, the speed flashed up on the camera is exactly the same speed as shown on the digital readout on the speedo so I don't think you have anything to worry about the speedo reading being to far out.

Cheers
Col

Tue Feb 18 2020 11:31pm

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