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Tyre size / type

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Gid

Member Since: 22 Sep 2013
Location: Southampton
Posts: 30

2015 Discovery 4 3.0 SDV6 HSE Auto Firenze Red

Tyre size / type

Hi All looking for some guidance on tyres, need to replace present Pirelli’s on D4 with maybe General Grabber (if not too noisy) AT3 but not sure on size, original size is 255/50/20 but have seen some people increase profile to 55 and width to 265 or 275, questions are does the extra height/ width make much difference and would they still fit in spare wheel position? And what’s the road noise like? Thanks in advance Gid.

16th Mar 2022 10:42 am

qcnr

Member Since: 23 Nov 2017
Location: Norway
Posts: 117

Understand tyre sizes so you can make an informed decision.
255 is the width of the tyre in mm.
50 is the profile size as a % of the width.
20 is the hole in the middle.

So any adjustment to the width or profile or both will result in a taller, wider or taller and wider tyre.

16th Mar 2022 11:00 am

ronp

Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15264

2014 Discovery 4 3.0 SDV6 HSE Auto Corris Grey

I’m running AT3s at 275/45/20.
That size equates roughly to the same sidewall height (& rolling radius) as the 255/50/20.

No noticeable noise with these tyres ….. and a great all round choice for the Disco.

Be aware that the AT3 is offered at different speed ratings, I’d suggest going for the higher rating.
No real reason (apart from the obvious), it’s just because you can.

16th Mar 2022 12:23 pm

Trailered Movements

Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1200

2011 Discovery 4 3.0 SDV6 Commercial Auto Sumatra Black

Also bear in mind that LR used 8.5" wide wheels with 255 tyres, and 9.5" wide with 275 tyres.

Dave 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago)

16th Mar 2022 12:45 pm

Gid

Member Since: 22 Sep 2013
Location: Southampton
Posts: 30

Thanks for the reply’s if I change the profile from 50 to 45 or 55 will speedo still be accurate and will they fit in spare wheel position if I go to 275?

16th Mar 2022 1:02 pm

nigethecat

Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4244

2016 Discovery 4 3.0 SDV6 Commercial XS Auto Corris Grey

Same as ronp I ran AT3's at 275/45/20 and they would fit in the wheel well but it was a squeeze ! More of an issue to get down than up surprisingly ! I want to see the sweets before I get into your windowless van... I'm not stupid!

Corris Grey D4 Commercial SE 2016
Zermatt Sliver 2007 D3 SE manual (gone)
Indus Silver D4 HSE 2015 (gone)
Bonatti Grey D3 HSE 2006 (gone)
White D3 S (LHD) 2007 (gone)
Firenze Red D4 HSE 2014 (gone)
Black RRS 3.6TDV8 2008 (gone)
Rusty Green Defender 110 1997 (gone)
Black FL2 HSE 2013 (gone)

16th Mar 2022 1:29 pm

Trailered Movements

Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1200

I couldn't get a 255/55x20 in the well, but a 275/45x20 fits.

Dave 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago)

Last edited by Trailered Movements on 16th Mar 2022 3:22 pm. Edited 1 time in total

16th Mar 2022 1:43 pm

NJSS

Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10806

2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo Grey

I have Yokohama Geolandar A/T G015s - 255/55 R19 111H and can get the spare in the well.

NJSS

16th Mar 2022 3:15 pm

Gid

Member Since: 22 Sep 2013
Location: Southampton
Posts: 30

Hi All thanks for all the reply’s but I have been reading tooo much stuff on tyre size and would like to know if fitting 255/55/20 general grabber AT3’s will cause any rubbing issues? As don’t want to buy then regret it 🫤

23rd Mar 2022 3:23 pm

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