Member Since: 05 Dec 2017
Location: Ingatestone
Posts: 266
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!!!)
You may need, & it would certainly be prudent, to check with your insurers.
NJSSAm I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
1st Mar 2018 12:02 pm
Space Cadet
Member Since: 05 Dec 2017
Location: Ingatestone
Posts: 266
(….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…?!
1st Mar 2018 12:12 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72768
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.
1st Mar 2018 12:48 pm
Space Cadet
Member Since: 05 Dec 2017
Location: Ingatestone
Posts: 266
Thanks, that makes perfect sense, glad they saw the logic.
I wonder what the logic is though regarding the D4 ‘needing’ a W?
1st Mar 2018 12:52 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72768
Is it a case of what suits the car or what tyre size/spec is available from tyre manufacturers?
1st Mar 2018 12:53 pm
Space Cadet
Member Since: 05 Dec 2017
Location: Ingatestone
Posts: 266
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???
1st Mar 2018 1:03 pm
mz mini
Member Since: 02 Jul 2014
Location: Sunny Devon
Posts: 1759
Or perhaps could it be the higher the rating the higher the price Land Rover 90 - deceased
Discovery 3 - deceased
Discovery 4 2013
Mini Cooper S 1964 Mk1 - International Rally winner red & white
Mini Cooper s 1964 Mk1 - Road Rally champion green & white
Mini Cooper S 1971 Mk3 - original and unrestored
Porsche 911 997
Porsche Boxster 3.4S
VW Polo 1.2
Citroen Xsara Picasso - shed/run around
1st Mar 2018 2:44 pm
Space Cadet
Member Since: 05 Dec 2017
Location: Ingatestone
Posts: 266
That's it, must be!!
1st Mar 2018 3:00 pm
mz mini
Member Since: 02 Jul 2014
Location: Sunny Devon
Posts: 1759
Sea Cadet hi in the Porsche world its called Porsche tax EG clutch plate prices
in a Porsche box around £800
Car Parts 4 Less Sachs £350
both made by Sachs
both same part number
enough said Land Rover 90 - deceased
Discovery 3 - deceased
Discovery 4 2013
Mini Cooper S 1964 Mk1 - International Rally winner red & white
Mini Cooper s 1964 Mk1 - Road Rally champion green & white
Mini Cooper S 1971 Mk3 - original and unrestored
Porsche 911 997
Porsche Boxster 3.4S
VW Polo 1.2
Citroen Xsara Picasso - shed/run around
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"
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