Well said and explained Truckbus UK.

 

Expect at least one red downward arrow for your troubles!

I have CrossClimates on my 2013 Yeti which have covered over 50,000 miles and still have 4 - 5mm left. Oh! and they are quiet and grip well in low temperatures and snow. 

I have been running these for the last 3 years can't fault them.

https://www.oponeo.co.uk/tyre/nexen-n-blue-4-season-225-50-r17-94-v#311746500

On 28/08/2020 at 19:33, TruckbusUK said:

the rating actually means the speed that the tyre can sustain for 600 seconds before suffering a catastrophic carcass failure

That is the biggest and most dangerous load of crap I have ever heard, it is the highest speed the tyre can safely maintain within the load limits of the tyre.

I am still confused as to why my Yeti is spec'd at 225/50/R17/94W when it is not capable of achieving that speed (W = 168MPH)

even when going downhill, fully loaded with hydrogen balloons.

 

Here's a paragraph from the RAC website within its What is a tyre speed rating? - everything you need to know article

Speed ratings are achieved through tests performed by engineers who run the tyre at 6.2 mph steps, in 10 minute increments, until the required speed has been met.

 

Is this from whence some confusion has arisen? 600 seconds / 10 minutes? Unfortunately, the RAC article does not explain further regarding these engineers' tests.

There is an excellent thread on here full of info about what tyres it came from the factory on.  That would seem to be a good starting place to decide on what could be used.  It also has comments from people who have used various brands of tyres.  https://www.briskoda.net/forums/topic/148948-yeti-tyre-and-rim-guide/

 

It seems that over the years Skoda has supplied tyres from different manufacturers at different speed ratings for the same vehicle. Basically anything at or above the specified minimum speed rating is fine. Checking back my first Yeti (2012 1.2 Tsi DSG) was supplied with V rated tyres, my latest Yeti (2017 1.2 Tsi DSG) was fitted with H rated tyres. Looking again at the speed ratings per tyre, H are approved up to 130 MPH. Now unless you are crazy and driving down a steep hill flat out you are not going to get anywhere near 130MPH in a Yeti - and at that speed in a Yeti your greatest worry won’t be the tyres but the hedge into which you are going to crash!

My Yeti, purchased near the same time as Expatman's, left the factory with W rated Pirelli Cinturatos.

I suspect there will be an official minimum tyre size, load and speed rating listed somewhere for your car.

 

Here in Germany this information is printed on the log book.

 

If you still have the Certificate of Conformity this information should be on there.

 

I don't know how strict it is at MOT with tyre sizes and ratings and if they'd even notice. But in Germany on the TÜV they are super strict and check the size and ratings are suitable.

The EU certificate of conformity for my 108hp Yeti type 5L Variant ACCFHFX1 shows only one homologated tyre & wheel combination for front & rear axles.

 

205/50 R17 93T 6Jx17 ET45

 

Only problem is that it left the factory with 16" wheels 🥴

 

I wish I hadn't checked it now, I registered it in France using a newly issued UK MOT (a car cannot be sold or registered by a new owner without a test certificate issued within the last 6 months) which is now valid for 2 years here! However its likely to fail on the wheels/tyres at the next CT test.

 

Update, under section 52 Remarks it shows several other 16" & 17" wheel & tyre combinations with speed ratings of 91T, 95T & 94T.

 

So I am relieved now, maybe even my winter wheels will be compliant.

16 hours ago, Urrell said:

That is the biggest and most dangerous load of crap I have ever heard, it is the highest speed the tyre can safely maintain within the load limits of the tyre.

 

Well that took longer to come than anticipated, but many thanks for your kind words Urrell, but sorry your are incorrect in your defn/assumption, it is the highest speed the tyre will maintain, but only for 600 seconds, as that is all it has been tested to (testing is done in 10km per hour steps and usually stop once the tyre design parameters have been reached.)

I accept that tyres will all be different and some will fail earlier than others, but are you willing to take that risk ... catastrophic failure (delamination, sidewall failure or blowout) are all are likely as the tyre has not been tested for that, unless you are promoting skills as a "tyre whisperer" you will never know as its impossible to tell, hence stick to the sidewall speed rating.

 

As to the comment " biggest and most dangerous load of crap I have ever heard" you are entitled to your opinion, but that is how the rating is calculated and what it means, I am unsure why erring on the side of caution is dangerous, but so be it in your world.

 

🙂

Edited 30 August, 20205 yr by TruckbusUK

It justs needs the words re-arranging that is all!

 

It is the highest speed the tyre can safely maintain within the load limits of the tyre.

 

That is the biggest and most dangerous load of crap I have ever heard!

On 28/08/2020 at 19:33, TruckbusUK said:

the rating actually means the speed that the tyre can sustain for 600 seconds before suffering a catastrophic carcass failure

Post a shortcut to where it says ""the rating actually means the speed that the tyre can sustain for 600 seconds before suffering a catastrophic carcass failure ..."""
I know I am not getting a sensible reply to that.

1 hour ago, Urrell said:

Post a shortcut to where it says ""the rating actually means the speed that the tyre can sustain for 600 seconds before suffering a catastrophic carcass failure ..."""
I know I am not getting a sensible reply to that.

Oh you could but Im far to polite .... if you think its wrong link to your counter evidence.

https://en.wikipedia.org/wiki/Tire_code

 

Speed rating[edit]

The speed symbol is made up of a single letter or an A with one numeral. It indicates the maximum speed at which the tire can carry a load corresponding to its Load Index.^[18] The testing method consists of pressing the tire against a large diameter metal drum to reflect its appropriate load, and run at ever increasing speeds in 10 km/h (6.2 mph) steps in 10 minute increments until the tire's required speed has been met.^[20]

 

 

^{Thanks, AG Falco}

A pass on the test means that the tyre can be taken up to the rated speed under full rated load for 10 minutes without it exceeding a temperature and pressure threshold, if it remains within those parameters for 10 minutes with the temperature and pressure stable then it is likely to maintain the rated speed under full load all day long without any risk.

 

If it exceeds the temperature & pressure threshold then if the test were continued or the vehicle driven on the autobahn for an extended period then the tyre would fail and it would not take long at all with the temperature and pressure continually rising.

 

At that speed there would be only one failure mode, - catastrophic!!!!

5 hours ago, Urrell said:

Post a shortcut to where it says ""the rating actually means the speed that the tyre can sustain for 600 seconds before suffering a catastrophic carcass failure ..."""
 

 

"Without" rather than "before" would have been a better choice of word but the end result is the same, if you run a tyre at full rated load continously above its maximum rated speed it is likely to result in a catastrophic failure, the ambient temperature will either hasten its demise or might possibly save it but usually the temperature and pressure will keep climbing and like any pressure vessel without a safety blow off valve it will finally go bang.

1 hour ago, J.R. said:

if you run a tyre at full rated load continously above its maximum rated speed it is likely to result in a catastrophic failure,

 

That is not was said earlier, for reference it said """the rating actually means the speed that the tyre can sustain for 600 seconds before suffering a catastrophic carcass failure """
Of course it will likely fail if above either rated load or speed, but should run safely continuously up to rated load or speed not as above for 600 seconds before suffering a catastrophic failure.
There is a world of difference between those 2 comments.

5 hours ago, TruckbusUK said:

if you think its wrong link to your counter evidence.

 

I'm the one calling you out on stupid and dangerous comments, I knew you would not provide evidence that """the rating actually means the speed that the tyre can sustain for 600 seconds before suffering a catastrophic carcass failure """

I do not agree that the certification process and the testing regime give any assurance that a tyre can run safely continously at its maximum speed and load, they do attest that it will be safe for 10 minutes under those conditions.

 

If you can find any vehicle that has a maximum speed of 118mph that is homologated with T rated tyres & not H rated then it would be convincing but if there were one and you looked at the maximum axle weight you will probably find that it would be well under the load rating.

 

I dont think that I have ever had a vehicle that didnt have tyres rated well above its maximum speed, I was surprised to see that my Yeti with its supposed 108mph top speed was homologated with only T rated tyres but I bet it was fitted with H or V rated tyres from new like it currently wears. In fact i am pretty sure that the sticker on the fuel filler flap specifys H & V rated tyres, too late & dark to go looking now.

 

But for having to reregister my car in France & needing a CoC I would never have known what tyres were homologated.

We did not have much snow this winter but I was surprised how good the crossclimates was on ice. I have lots of experience with studded and winter tyres in other countries but in England I cant see any reason to go with proper winter tyres.

Took me a little while to get there but finally sorted this morning with 4 x Vredestein Quatrac Pro purchased on Black Circles and fitted at ATS. Thanks for the information all.

 

Looks like I timed it right to buy them too. They have gone up almost £23 each now!

Edited 16 September, 20205 yr by Bertha108
Added information

Good choice.

I have been running Vredestein Quatrac as my winter tyres for years. Always good for me.

 

Thanks, AG Falco

 

 

25 minutes ago, AGFalco said:

Good choice.

I have been running Vredestein Quatrac as my winter tyres for years. Always good for me.

 

Thanks, AG Falco

 

 

I hope so! Reviews look good and they were a sensible price.

On 29/08/2020 at 22:26, Expatman said:

It seems that over the years Skoda has supplied tyres from different manufacturers at different speed ratings for the same vehicle. Basically anything at or above the specified minimum speed rating is fine. Checking back my first Yeti (2012 1.2 Tsi DSG) was supplied with V rated tyres, my latest Yeti (2017 1.2 Tsi DSG) was fitted with H rated tyres. Looking again at the speed ratings per tyre, H are approved up to 130 MPH. Now unless you are crazy and driving down a steep hill flat out you are not going to get anywhere near 130MPH in a Yeti - and at that speed in a Yeti your greatest worry won’t be the tyres but the hedge into which you are going to crash!

Skoda don’t make tyres, but you have managed to highlight that over time tyre manufacturers have increased speed rating.    If no one is making the lower speed rated ones anymore then have to use a higher speed rating for the size.

 

If you go shopping in a supermarket, and if trolley is big instead of smaller, doesn’t mean you have to fill it.  Same concept, don’t have to drive at the highest speed just because excessive maximum exists.