So it seems I need the 4 wheel tracking done. Noisy and uneven wear on the rears.

I sit on the motorway. I do have fun, but generally in a straight line and not hard cornering etc. Looking on asda tyres (yes-they do tyres too!) I see a tyre rated 'b' for fuel efficiency and also for wet weather performance. It is £70 and according to the ratings outstrip tyres twice the price.

There must be other factors, as this seems a bargain. It is a Sailun 225/40R18 92W XL Z4+AS Atrezzo. What is xl z4+as? What does it mean and is it a good price, or false economy?

Jamie

Who's rating is making these claims?

What pressures do you run?

Most issues I've seen, including others at work, are down to using the wrong pressures. Every other person in our fleet has had issues with inner wear except me. The only difference is I run higher pressures than they do because we carry loads. They use the min values, their own allowence on top, or until they 'look right'.

What pressures do you run?

Most issues I've seen, including others at work, are down to using the wrong pressures. Every other person in our fleet has had issues with inner wear except me. The only difference is I run higher pressures than they do because we carry loads. They use the min values, their own allowence on top, or until they 'look right'.

errm, 48. looked at tyre, saw '55 max pressure', so went a bit under to be safe.......

it was pointed out t service the other day pressures were all over the place and to look under fuel flap for correct ones, however there has always been excessive road noise from tyres and he looked at wear pattern and said I need 4 wheel allignment.

as for the ratings, they are now given for all tyres. rated a to g for efficiency and wet performance, I guess from the manufacturers, or are they independantly tested?

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A good fuel rating generally will mean they are quite hard and so offer poorer grip. Being some chinese no-brand, it being made of hard rubber/plastic does not surprise me.

The XL generally means extra load rating, but at 92 it doesn't appear that great, unless their standard version is much weaker, again I wouldn't be surprised, I've seen no-brands that you could only just inflate to the minimum rating for the car (they came off within days of purchase).

AS will likely be asymmetric tread pattern.

The EU lettering also generally bears next to no relation to tyre reviews by both magazines and people and I don't bother with it at all.

ok, so bearing in mind I have a service, 4 wheel allignment, new brakes and a pair of shocks to do, I am not flushed for cash. any recommendations on a tyre that is ok, but not made out of twenty pound notes.

happy to pay extra if worth it. not racing around, or driving like a nutter, mainly cruising on motorway and occasional trip into town....

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Both of you - look on a tyre site and you'll find useful information. I'm using Camskill and mytyres for this reply ...

The XL generally means extra load rating, but at 92 it doesn't appear that great, unless their standard version is much weaker

The standard load rating in this size is 88, and the common XL rating is 92.

I am not flushed for cash. any recommendations on a tyre that is ok, but not made out of twenty pound notes.

Looking at what is available, and assuming you prefer to avoid the makes that people who have any interest in decent tyres generally avoid, you should probably expect to pay anywhere from best part of £100 per corner for a fitted tyre.

You really should check your handbook or maybe a label somewhere on the car that specifies what tyres are required. For instance, if your car needs XL tyres and you save money by using non-XL tyres you might be setting yourself up to fail an MOT, (notwithstanding potential safety issues).

If you are buying tyres for the Octavia, WiseBuyer's Guide says the standard wheel/tyre size is 225/45R17. The standard load rating in this size is 91, so if you are using a different wheel/tyre size you probably need to choose tyres with a load rating of 91 or higher. In the case of 225/40R18 then this does indeed mean XL (92).

'EC 1222/2009 Tyre legislation

In November 2012, new EU tyre labelling regulations (EC 1222/2009) will come into effect standardising the information presented to the consumer of three critical factors that may influence a buying decision.

These factors will include ratings for fuel efficiency, wet grip and external rolling noise. The ratings assigned to tyres will allow the consumer to make an informed decision.

This means that before a purchase is made, the consumer must be provided with information regarding rolling resistance, wet road braking performance, how well the tyre meets noise standards and the external noise value measured in decibels made by the tyre. This information must be presented to the consumer where the product is displayed online, in print or in store. The tyre must be accompanied, or displayed online with a pre-approved label in each of these circumstances.'

Fuel EffIcIency

~7.5% loss of fuel economy between best and worst class for a full setof tyres fitted to an average car. Much more for trucks.

WET GRIP

30% shorter braking distance between best and worst class for a full set of tyres fitted to an average car. Eg 18 m shorter when braking from 50 mph.

EXTERNAL ROLLING NOISE (displayed as a scale of black bars accompanied by a sound pressure level in dB (A) )

3 black bars: above future EU limit

2 black bars: meets future EU limit

1 black bar: at least 3 dB below the future EU limit

If memory serves, 3dB represents an approximate doubling in sound pressure level.

"EC 1222/2009 Tyre legislation" quotes the results of tests done by the tyre manufacturers themselves. It makes EU standard fuel economy tests look sensible as an idea!

"EC 1222/2009 Tyre legislation" quotes the results of tests done by the tyre manufacturers themselves. It makes EU standard fuel economy tests look sensible as an idea!

so a chinese tyre where they are not under the eu umbrella could exagerate figures knowing there would be little comeback? could that be why the 70 quid one rates so well?

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so a chinese tyre where they are not under the eu umbrella could exagerate figures knowing there would be little comeback? could that be why the 70 quid one rates so well?

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{Francis Urquart} You might think that: I could not possibly comment. {/end}

errm, 48. looked at tyre, saw '55 max pressure', so went a bit under to be safe.......

it was pointed out t service the other day pressures were all over the place and to look under fuel flap for correct ones, however there has always been excessive road noise from tyres and he looked at wear pattern and said I need 4 wheel allignment.

as for the ratings, they are now given for all tyres. rated a to g for efficiency and wet performance, I guess from the manufacturers, or are they independantly tested?

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48?!?! That seems way too high unless you're always fully laden. I thought most ran their 18's on 36.

What brand do you currently have? Some are worse for uneven wear and noise than others.

You should be able to get some Primacy 3s for around £100 each and typically they're good for over 20k. I've never had less than 30k from Michelin and that's not miss daisy driving

Cheap tyres are a false economy IME.

48psi is way too high. My mrs just had her brother,his mrs and daughter come over from France for a week and I thought I would up the pressure from 33 all round to 36 because of the extra weight. I suspect your uneven wear is inside edge and caused by too much negative camber. Mine had it bad when I got it,read on here it was a common problem on the VRS. Got the alignment done to the 'revised' settings for the VRS and it's been fine.

errm, 48. looked at tyre, saw '55 max pressure', so went a bit under to be safe.......

That's advice for tyre fitters, as to the maximum pressure that they should use to mount the tyres.

Skoda are reasonably "generous" with the range of sizes they advise recommended pressures for. IF and only if you start getting edge or centre wear at the recommended pressure start varying from these, going up in steps of about 2PSI for edge wear, and down similarlt for centre wear, until it stops.

just lolked at the rears which looked fine, but on inside there is wear, fine, wear, fine all the way round about 3 - 4 inches apart. can't be pressures, getting 4 wheel track and new tyres asap.....

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just lolked at the rears which looked fine, but on inside there is wear, fine, wear, fine all the way round about 3 - 4 inches apart. can't be pressures, getting 4 wheel track and new tyres asap.....

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What pressure are you running?

it was way too high, but the wear, accompanied by the excessive road noise is I think what is called 'sawtoothing', which I read on here once a dealer describe it as a 'characteristic' of the VRS

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just lolked at the rears which looked fine, but on inside there is wear, fine, wear, fine all the way round about 3 - 4 inches apart. can't be pressures, getting 4 wheel track and new tyres asap.....

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That could be

1. geometry,
   
2. or "saw-toothing" which is caused by hard braking. If you're running asymmetric tyres (marked "this side out"), swap the rears side to side and most of it should sort itself out in the next few thousand miles.
   

Edited 22 April, 201313 yr by KenONeill