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Speed rating W vs Y
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Space Cadet
 


Member Since: 05 Dec 2017
Location: Ingatestone
Posts: 251

United Kingdom 2014 Discovery 4 3.0 SDV6 XS Auto Santorini BlackDiscovery 4
Speed rating W vs Y

Is there any reason why I wouldn’t want to put a tyre (Y) with a higher speed rating than my current, and advised for the D4, (W)??

I don’t very much the D4 could get anywhere near the 168 mph listed for the W, whereas the Y can apparently go up to 186 mph (which would be very scary in a Disco!!!)

Thanks
  
Post #19205111st Mar 2018 11:01 am
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Hardware17
 


Member Since: 28 Jun 2016
Location: Manchester
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England 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

i'm surprised you've found "SUV" tyres with that rating. what are they ?
  
Post #19205151st Mar 2018 11:12 am
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Space Cadet
 


Member Since: 05 Dec 2017
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United Kingdom 2014 Discovery 4 3.0 SDV6 XS Auto Santorini BlackDiscovery 4

Scorpion Zero, 255/50R20 109Y XL

My question was if there's any reason why I wouldn't want to fit a higher rated tyre?
  
Post #19205331st Mar 2018 11:52 am
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NJSS
 


Member Since: 06 May 2009
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United Kingdom 2016 Discovery 4 TDV6 Landmark LE Auto Waitomo GreyDiscovery 4

You may need, & it would certainly be prudent, to check with your insurers.

NJSS
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Post #19205381st Mar 2018 12:02 pm
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Space Cadet
 


Member Since: 05 Dec 2017
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United Kingdom 2014 Discovery 4 3.0 SDV6 XS Auto Santorini BlackDiscovery 4

(….I am an underwriter….!!)

Decreasing a risk would not have to be declared. Perhaps reducing from W to V may increase the risk so therefore you would have a point, but on the basis that V’s are meant to be capable of 149mph they are probably still overkill for a D4!

Perhaps there is something though to do with the weight or weight distribution or the heat generated etc. etc. that warrants a D4 needing a W 168 mph capable tyre even though it won’t do anywhere near that speed??

There are ‘better’ V rated tyres available, but am not going to risk anything by going lower than a W, my question still stands though if there is any reason why I shouldn’t fit a higher rated tyre??

Surely there can’t be…?!
  
Post #19205451st Mar 2018 12:12 pm
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DSL
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United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Zermatt SilverDiscovery 4

I'm going the other way, from Vs (Wranglers) to H (Pirelli ATRs). Insurer (NFU) quite happy with that, I just explained that H = up to 130mph and the car is limited to 112mph. Besides, I usually plod along at 60mph on long hauls and will be going nowhere near 112mph. Thumbs Up
 

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Post #19205641st Mar 2018 12:48 pm
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Space Cadet
 


Member Since: 05 Dec 2017
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United Kingdom 2014 Discovery 4 3.0 SDV6 XS Auto Santorini BlackDiscovery 4

Thanks, that makes perfect sense, glad they saw the logic.

I wonder what the logic is though regarding the D4 ‘needing’ a W?
  
Post #19205671st Mar 2018 12:52 pm
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DSL
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United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Zermatt SilverDiscovery 4

Is it a case of what suits the car or what tyre size/spec is available from tyre manufacturers?
 

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Post #19205711st Mar 2018 12:53 pm
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Space Cadet
 


Member Since: 05 Dec 2017
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United Kingdom 2014 Discovery 4 3.0 SDV6 XS Auto Santorini BlackDiscovery 4

I'm guessing probably the later.

If the former, then perhaps higher rated tyres have, say, stronger side-walls or different compound rubber, or perhaps its just that they're stronger???
  
Post #19205771st Mar 2018 1:03 pm
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mz mini
 


Member Since: 02 Jul 2014
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United Kingdom 2008 Discovery 3 TDV6 XS Auto Bonatti GreyDiscovery 3

Or perhaps could it be the higher the rating the higher the price Whistle
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Post #19206551st Mar 2018 2:44 pm
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Space Cadet
 


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United Kingdom 2014 Discovery 4 3.0 SDV6 XS Auto Santorini BlackDiscovery 4

That's it, must be!!
  
Post #19206651st Mar 2018 3:00 pm
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mz mini
 


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United Kingdom 2008 Discovery 3 TDV6 XS Auto Bonatti GreyDiscovery 3

Sea Cadet hi in the Porsche world its called Porsche tax EG clutch plate prices
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both made by Sachs
both same part number
enough said Whistle
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 Land Rover 90 - deceased Sad
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Mini Cooper S 1971 Mk3 - original and unrestored Smile
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Post #19206731st Mar 2018 3:08 pm
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Hardware17
 


Member Since: 28 Jun 2016
Location: Manchester
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England 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

going back a lonnnnnggggg way, I had a mate get an alternator for his VW Scirocco and the guy in the parts department said "definitely for a VW?" ….
"Yes" ….
"that's £24 then sir … if you'd said Audi I would have to charge you £48 or if you said Porsche, it would be £96"
  
Post #19207851st Mar 2018 6:39 pm
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