On 20/02/2020 at 00:00, Carlston said:

 

Car speedos under-read by about 5% when on standard tyres.

 

 

 

This is incorrect.

Car speedos to be legal must never under read i.e. show a speed less than actual. 

They are, however, allowed to over read i.e show a speed higher than actual, subject to certain tolerances. 

 

Tom

8 hours ago, Sanqhar said:

Car speedos under-read by about 5% when on standard tyres.

This is incorrect.

Car speedos to be legal must never under read i.e. show a speed less than actual. 

They are, however, allowed to over read i.e show a speed higher than actual, subject to certain tolerances. 

 

Tom

 

Typo...Car speedos over-read by about 5% when on standard tyres.

Yes Carlston.  Sorry, I got it wrong what you were saying about 215 wide tyres and 6J wheels, & presumably 'stretches' the sidewalls in the opposite way to using 7J wheels.  The tyre/ wheel size options tyou mention hat might work well are mostly non standard for Karoq, so inclined to keep clear of them.

215/60 R16 tyres on 6Jx16 wheels are approved by Skoda.
I have them in winter version - they look nicely paired and resist curbing.

Yes Agedbriar, but it is interesting what Carlston says about the best match of wheel and tyre widths and it got me thinking.  Nevertheless, I think I'll stay with my decision to change to the Skoda approved size 215/60 R16 tyres on 6Jx16 wheels for next winter, PLUS I see one or 2 people have been saying good things about Goodyear 4 season tyres on the Karoqs, so they're still my top choice too.  I'll maybe get a 5th wheel of same size as a spare, but could fit a 185x60 tyre to make boot floor a bit lower, by 30mm presumably.

6 minutes ago, croquemonsieur said:

Yes Agedbriar, but it is interesting what Carlston says about the best match of wheel and tyre widths and it got me thinking.  Nevertheless, I think I'll stay with my decision to change to the Skoda approved size 215/60 R16 tyres on 6Jx16 wheels for next winter, PLUS I see one or 2 people have been saying good things about Goodyear 4 season tyres on the Karoqs, so they're still my top choice too.  I'll maybe get a 5th wheel of same size as a spare, but could fit a 185x60 tyre to make boot floor a bit lower, by 30mm presumably.

 

If you have four 215/60R16 tyres, then a 185/60R16 tyre would be completely the wrong size to use as a spare.

 

The 215/60 tyre has a sidewall height of 215 x 0.60 = 129mm, whereas the 185/60 tyre has a sidewall height of 185 x 0.60 = 111mm.

 

60 means that the sidewall height is 60% of the width.

 

60 is the aspect ratio.

 

If that wasn't all, another problem is that a 185/60 tyre has a much lower load index than a 215/60 tyre. It simply can't support anywhere near the same amount of weight.

Cheap steel rims and tyres for the Skoda Karoq

 

On the Skoda Karoq, if you've got 288mm diameter front discs rather than the larger 312mm diameter front discs, then 15" wheels would fit. 15" wheels are a non-standard size.

 

Skoda Octavia MK3/VW Golf MK7 steel rims are available in size 6Jx15 ET43 for £28.60 each on mytyres.co.uk

 

Alcar 7755 6Jx15 ET43 5/112 57.1

 

https://www.oponeo.co.uk/steel-wheel/alcar-kfz-7755

 

(link to oponeo for just the photo. mytyres are usually cheaper for steel rims)

 

Alcar 7755 is an 18-hole design.

 

205/70R15 tyres have about the same outside diameter to 215/60R16 tyres. Vredestein Quatrac 5 in 205/70R15 96T are available for £56.55 each on camskill.co.uk

 

https://www.camskill.co.uk/m138b0s7998p144823/Vredestein_Tyres_All_Season_Car_Vredestein_Quatrac5_Vredestein_Quatrac_5_-_205_70_R15_96T_TL_Fuel_Eff_%3A_C_Wet_Grip%3A_C_NoiseClass%3A_2_Noise%3A_70dB

 

T-speed rated tyres are rated up to 118mph (190km/h) so only 115HP Karoqs don't go faster than this. However, Vredestein Quatrac 5 tyres are 3PMSF (3 Peak Mountain SnowFlake) approved, which means they are winter tyres so could probably be officially used on more power versions that can officially go faster than 118mph. Don't drive at more than 118mph on T-rated tyres.

 

Tyre pressure for the 205/70R15 tyre size can be the same as the 215/60R16 tyre size or even 1psi less as the standard load index for 205/70R15 tyres is 96 (710kg) whereas the standard load index for 215/60R16 tyres is 95 (690kg).

Edited 23 February, 20206 yr by Carlston

Drivers beware of poor guidance.  It is your Licence and your insurance that matters,

http://oponeo.co.uk/blog/tyre-speed-rating

*There are mistakes here on the Speed Ratings Table if you look.*

 

 

When fitting All Season / All Weather / or 'have them on all year tyres in the UK'

treat the speed rating as you are required to with Summer Tyres.

 

The Manufacturers recommendations are not just by the maximum speed that a car can officially reach. 

As it is there are people Remapping / fitting tuning boxes.  Also taking vehicles out of the UK.

 

Edited 23 February, 20206 yr by Roottootemblowinootsoot

I doubt any Skoda Karoq fitted with 288mm front discs has more than 115hp, so won't have a top speed of more than 118mph. Hence, 115hp Karoq's don't need more than T speed rated tyres...at least in the UK.

@Carlston   Some of your advice is dangerous.  It needs taken not with a pinch of salt but lots of thought over where you get your information.

Assumption can be the cause of the mother of all F**k-ups.

 

Speed and load rating and manufacturers guidelines are not just based on top / max speeds but on cornering forces.

 

 

 

 

 

Edited 24 February, 20206 yr by Roottootemblowinootsoot

Another thought regarding the spare.  Be careful regarding the difference between the diameters of the wheel/tyre on the same axle.  This is especially relevant for 4wd cars where there is a diff on the front and back axles.

I have a classic skinny spacesaver on my 2wd Karoq.  For a front tyre puncture I would fit the spare to the front just to get me moving and out of danger however as soon as possible and safe I would put it on the back moving one of the good rear wheels to the front.  If I had a 4wd car I would seriously consider carrying a full size spare.

 

tom

If travelling in Winter or bad weather, on Bank Holidays, Festive Season Holidays  (especially in Scotland or rural areas),

& you have on Winter or All Season tyres, or ones difficult to source a match for maybe carry a spare pair of wheels / tyres.

 

If you have on your winter wheels / tyres maybe put a pair of your summers in the car or vice versa.

 

That is if you do not want to spoil a trip or motoring holiday etc by being limited in speed you can travel or even left waiting for days to travel.

1 hour ago, Sanqhar said:

Another thought regarding the spare.  Be careful regarding the difference between the diameters of the wheel/tyre on the same axle.  This is especially relevant for 4wd cars where there is a diff on the front and back axles.

I have a classic skinny spacesaver on my 2wd Karoq.  For a front tyre puncture I would fit the spare to the front just to get me moving and out of danger however as soon as possible and safe I would put it on the back moving one of the good rear wheels to the front.  If I had a 4wd car I would seriously consider carrying a full size spare.

 

tom

Yep, I'm amazed at how many vehicles I see running around with a tiny 'space saver' wheel on the driving axle - I cringe when I see this on front wheel drive motors being driven without caution - noticed one last night, a beat up Laguna on a fast roundabout with the little spare on the nearside looking well stressed........

A "fast roundabout" is not a command or an obligation.

 

When I have to do a wheelchange in a dodgy roadside position I am not going to faff around removing front and back wheels with the car balanced on the toolkit jack, i will put the spacesaver on in place of whatever tyre is punctured and drive slowly and cautiously to a place of safety.

I see lots of cars that run the 'Space Savers' for week after week.

 

There is a particular car model from a particular country that seems to often have a Space Saver on while running pretty fast on motorways in the UK.

It is not the same car, but they are VW Passat Estates on Polish Plates.

1 hour ago, J.R. said:

A "fast roundabout" is not a command or an obligation.

 

 

A1(M) / M18 junction roundabout.......traffic light controlled and certainly in the ‘fast roundabout’ category.......

12 hours ago, Roottootemblowinootsoot said:

@Carlston   Some of your advice is dangerous.  It needs taken not with a pinch of salt but lots of thought over where you get your information.

Assumption can be the cause of the mother of all F**k-ups.

 

Speed and load rating and manufacturers guidelines are not just based on top / max speeds but on cornering forces.

 

There's nothing dangerous about fitting T-rated tyres to a car that has a top speed lower than 118mph. If it was dangerous, the car wouldn't pass its MOT.

 

My car's top speed is less than 118mph and has T-rated tyres. My local MOT tester checks them very carefully every year. Last time he said "these are good". I wasn't surprised he said that because my tyres have no cuts, no bulges, no exposed cord, and have over 1.6mm of tread depth. He didn't say "I'm failing your tyres because they are not H-rated and therefore might explode if you go round corners quickly".

 

There's plenty of 205/70R15 tyres that are H-rated, so if you did feel the need to fit them to a car that has a top speed of less than 118mph you could.

 

Two of the tyre sizes that are approved for the Skoda Fabia MK1 are 155/80R13 and 165/70R14. They are T-rated. The insurance companies don't say "we are going to have to charge you a big premium because these T-rated tyres might explode if you go round corners quickly as they are not H-rated". In fact, lower profile tyres such as 195/50R15 and 195/45R16 that have H and V speed ratings are more worrying for insurance companies and consequently have higher insurance premiums. High performance cars are more likely to be involved in an accident than low performance cars.

Edited 24 February, 20206 yr by Carlston

@Carlston  You are  Legal and just a wee bit risky, and giving out duff gen.

A UK MOT is meeting a safety standard.   As to what you think and what your MOT tester decides that is lovely.

What you or any Insurance Loss Adjuster or examiner agree on will be interesting if it ever comes to that.

 

You just keep on trucking along in your Fabia or what ever but people really need to get second opinions on your opinions.

Edited 24 February, 20206 yr by Roottootemblowinootsoot

2 minutes ago, Roottootemblowinootsoot said:

@Carlston

You just keep on trucking along in your Fabia or what ever but people really need to get second opinions on your opinions.

 

I would hope anyone who modifies their car gets as many opinions as they can, and if in doubt keep it standard.

@Carlston

People do not need to keep cars standard, just modify safely and declare mods.    The problem with your attitude is always about going narrow, finding the cheap option, 

and looking at what is available on other countries cars but forgetting that people take cars abroad and some do put the pedal to the metal.

 

The OP of this thread said he was getting a 190ps Karoq delivered.   Others here have a 1.0TSI that down hill with a back tail wind will exceed 118 mph, 

not that that will be blowing the tyres off or the doors.

Edited 24 February, 20206 yr by Roottootemblowinootsoot

1 hour ago, Carlston said:

There's nothing dangerous about fitting T-rated tyres to a car that has a top speed lower than 118mph. If it was dangerous, the car wouldn't pass its MOT.

 

An MOT tester does NOT check the speed rating or the weight rating of car tyres.

 

To pass an MOT test they need to have a speed rating above 70 MPH only and be sized matched on each axle.

 

You can pass an MOT with a mixture of summer, winter, all season, directional, asymmetrical, sided, symmetrical, normal load, extra load, and commercial tyres on the same vehicle so long as the size per axle is the same.

 

Thanks AG Falco

True. 3 winter tyres and one directional summer on the Polo this morning; all same size. No comment at all from tester.

Thanks Carlston (from a few days back).  I wasn't thinking, a 185 tyre isn't as tall as a 215 of same profile and whell diameter.  Will probably stick with my space-saver, rather than lose the boot space and just accept I'll have to potter along to a garage if I get a puncture.  I had 2 punctures in my previous Yeti but were slowish and pumped them up & managed to get to tyre places for repairs  both times - lucky they were close by.   Had 2 punctures in Saab before that, one similar procedure, but one did involve a wheel change - that was some years ago.

Merlin man,

We have an Edition on Craters and the ride is not good. If you want your new car to ride like the Yeti I humbly suggest you wait till the Karoq arrives and then try it on the Annapurnas you have. Unless you are insensitive I think you will find it like night and day

Perhaps your roads are in good condition but where I live I would switch to 16 or 17 inch rims in a heartbeat. Better choice of winters in these sizes as well.