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Anyone understand the speed rating on tyres?
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charlietortoise
 


Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 446

2010 Discovery 4 3.0 TDV6 HSE Auto Barolo BlackDiscovery 4
Anyone understand the speed rating on tyres?

I bought two trailer wheels and tyres from e bay. As advertised 145/80R10, what I got was 145/80B10

So I think I have been had and that a B rating is only good for 31mph. Where as an R is good for 108 mph. Granted that I wont be needing the full capability of an R I am sure that I will need a bit more than 31mph.

These are the only markings I can find in the tyres and in the load index it has a B.

Have I read this correctly?

Thanks




 Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch πŸ˜‚  
Post #222695326th Apr 2021 9:04 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Darkest Norfolk
Posts: 3286

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

No, the B is for 'Bias Ply'. The speed/load rating is the 74N - 87mph, 387kg max load Thumbs Up
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 


Last edited by rrhool on 26th Apr 2021 9:37 pm. Edited 1 time in total 
Post #222695526th Apr 2021 9:18 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 9082

England 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

https://www.tyre-shopper.co.uk/tyre-advice...eed-rating

Sorry ... think you've received wheelbarrow tyres.
 .


Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer Sad ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms 
 
Post #222695626th Apr 2021 9:18 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Darkest Norfolk
Posts: 3286

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

https://www.tyre-shopper.co.uk/tyre-advice...load-index

Speed Load chart

Dean beat me!
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 
 
Post #222695726th Apr 2021 9:19 pm
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nigethecat
 


Member Since: 11 Sep 2016
Location: Aberchirder
Posts: 1592

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Indus SilverDiscovery 4

What happened to Z rated tyres?
 I want to see the sweets before I get into your windowless van... I'm not stupid!

Back in a D4 😎
Indus Silver D4 HSE 2015
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) 
 
Post #222695826th Apr 2021 9:21 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Darkest Norfolk
Posts: 3286

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

Mmm. Not sure
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 
 
Post #222696026th Apr 2021 9:24 pm
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charlietortoise
 


Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 446

2010 Discovery 4 3.0 TDV6 HSE Auto Barolo BlackDiscovery 4
Load rating

I think the 74 is the load rating
 Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch πŸ˜‚  
Post #222696126th Apr 2021 9:27 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Darkest Norfolk
Posts: 3286

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

Yep, N = 87mph 74 = 387kg
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 
 
Post #222696226th Apr 2021 9:31 pm
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charlietortoise
 


Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 446

2010 Discovery 4 3.0 TDV6 HSE Auto Barolo BlackDiscovery 4
Relief

Very Happy Thats good then, they are ok then speed wise. I only need 60mph

Thanks for the clarification
 Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch πŸ˜‚  
Post #222696326th Apr 2021 9:36 pm
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gareth71
 


Member Since: 10 Apr 2016
Location: North-east Wales
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Wales 2009 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

...
 

Last edited by gareth71 on 27th Apr 2021 3:34 pm. Edited 1 time in total 
Post #222697426th Apr 2021 10:24 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Darkest Norfolk
Posts: 3286

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

^^

Did you not read any of the previous replies? Rolling Eyes
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 
 
Post #222697926th Apr 2021 10:55 pm
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L319
 


Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2030

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

The letter in the tyre size is nothing to do with the load and speed rating. No letter is cross ply construction, B is bias ply and R is radial ply.
My 1955 Land Rover came with 6.50 x 16 tyres, which were cross ply, I now use 6.50R x 16 , Radials.
  
Post #222705127th Apr 2021 11:32 am
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charlietortoise
 


Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 446

2010 Discovery 4 3.0 TDV6 HSE Auto Barolo BlackDiscovery 4
Ply

Can a Bias ply run on the same axle as a Radial ply? I am thinking not but I would like to confirm. Thanks
 Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch πŸ˜‚  
Post #222705227th Apr 2021 11:37 am
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ronp
 


Member Since: 29 Nov 2006
Location: 🌲Gallowayβ›°
Posts: 14206

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4
Re: Relief

charlietortoise wrote:
Very Happy Thats good then, they are ok then speed wise. I only need 60mph



For a D3 I think your insurance company would disagree.

And NO, I wouldn't mix tyre construction on the same vehicle, never mind same axle.
 πŸŒ²πŸŒ²in the forest & the hills β›°β›°  
Post #222705427th Apr 2021 11:43 am
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charlietortoise
 


Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 446

2010 Discovery 4 3.0 TDV6 HSE Auto Barolo BlackDiscovery 4
Thanks

Thanks for clarifying the ply mix. It is for a trailer so that why it tops out at 60mph. I am sending them back. The ebay tyre place was a bit shirty over it, all the adverts said it was a 145/80R10 and what I got was a B10
 Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch πŸ˜‚  
Post #222705727th Apr 2021 11:50 am
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