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Tyre size / type
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Gid
 


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

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4
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.
  
Post #228376216th Mar 2022 10:42 am
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qcnr
 


Member Since: 23 Nov 2017
Location: Norway
Posts: 103

Norway 

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.
  
Post #228376516th Mar 2022 11:00 am
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ronp
 


Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15208

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

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. Thumbs Up
  
Post #228377716th Mar 2022 12:23 pm
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Trailered Movements
 


Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1198

United Kingdom 2011 Discovery 4 3.0 SDV6 Commercial Auto Sumatra BlackDiscovery 4

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) 
 
Post #228378016th Mar 2022 12:45 pm
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Gid
 


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

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

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?
  
Post #228378216th Mar 2022 1:02 pm
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nigethecat
 


Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4138

Ukraine 2016 Discovery 4 3.0 SDV6 Commercial XS Auto Corris GreyDiscovery 4

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
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Post #228378716th Mar 2022 1:29 pm
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Trailered Movements
 


Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1198

United Kingdom 2011 Discovery 4 3.0 SDV6 Commercial Auto Sumatra BlackDiscovery 4

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 
Post #228379116th Mar 2022 1:43 pm
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NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10464

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

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

NJSS
  
Post #228380316th Mar 2022 3:15 pm
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Gid
 


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

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

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 🫤
  
Post #228484323rd Mar 2022 3:23 pm
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