I believe every road tyre has a tread wear indicator number on the side wall.
Is there any site that lists these?
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It's not on the side wall, but visible in the thread pattern when it is worn down to the point when the tyre is getting close to needing being replaced.
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Sorry - my fault - badly phrased post.
On most tyres there is a tread wear rating - which is a number normally between 100 and 500, which is printed on the sidewall of the tyre.
Is there any site or other location, which lists these in some form?
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A quick google found this:-
www.ntb.com/ntb_glossaryt.htm
Scroll down to the bottom of the page.
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It's not on the side wall, but visible in the thread pattern when it is worn down to the point when the tyre is getting close to needing being replaced.
Just before I go and get my tyres changed this afternoon....
With regards the wear indicators in the tyre tread grooves, are they set at the point where the type is illegal, or at the 1.6mm legal limit?
Or to put it another way, should I not have made myself clear, do you replace the tyre when there is no tread depth left above the indicator, or when there is slightly more than just 1.6mm of depth left?
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The tread wear indicator seems to be the maker's way of ssaying the tyre should be replaced. Searches indicate that makers are unwilling to commit themselves to a depth which these are set at, although 1.5 mm is mentioned on one site, and 1/16" (1.5875mm) on another. The MoT manual simply mentions that tyres should be replaced when the wear bars are level with the tread, and demands that the 1.6mm test is applied.
I'm guessing the vagaries of the rubber moulding process prevent them from being too precise, and they don't want a day in court either...
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drbe - some tyres do have the numbers you indicate i.e 100 120, 230 etc as this is used in the US . They are to show the hardness and expected wear of a tyre so a 200 tyre will last twice as long as a 100 tyre etc. Main problem is there is no industry standard for the testing, so these figures cannot be relied upon for accuracy.
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Ahem!!
www.nhtsa.dot.gov/cars/testing/utqg/UTQG_qna.html
www.nhtsa.dot.gov/cars/testing/utqg/
quote
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course
unquote
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Thanks for that Cyd and everyone else, the second URL>>>> www.nhtsa.dot.gov/cars/testing/utqg/ in particular; gave all the statistics that I was looking for. This is an American site, just to put the icing on the cake, is there a British version?
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As far as I know, you are talking about an American system, to which Europe does not suscribe.
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I would doubt the ability of any K^^k-F^t or other tyre depot to distinguish 1.5mm from 1.6 or 1.5875mm for that matter. Border line cases will be a matter for discussion.
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Agree Andrew.though Border line cases should not be open to discussion.once a tyre reaches 2mm min.it should be replaced.Thats my opinion anyway.:-)
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Was mech1
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>>do you replace the tyre when there is no tread depth left above the indicator, or when there is slightly more than just 1.6mm of depth left?
I wouldn't want to run tyres that low. Braking distance in the wet increases dramatically as tyres get close to the legal limit. Even my (very mean) leasing company will replace at 2mm.
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My (even meaner) leasing company wont change till its at the legal limit.
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Surely the trick is to arrange a puncture and sidewall damage at 2.5mm? ;-)
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Espada III - well if you have a family and need a Lamborghini, what else do you drive?
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