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#1 27-02-07 17:40:55

ExAdiNigel
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From: Plymouth, Devon
Registered: 13-12-04
Posts: 4,739

Tyre Wear Indicators

Can anyone find a definative statement from any of the Tyre manufacturers saying at what depth these indicators are set at?

I always thought they were set to about 2mm but the Pirelli site simply says they should be changed as soon as the indicator is reached, the Kwik-Fit site says they are 'often set to 1.6mm'.

I have had a 'discussion' with the owner of a chaufeur company I sometimes do some work for about the level he lets the tyres get to.  personally I think they should be changed by 3mm, but I can't push that one.  It would be great if I could direct him to a site that says the twi's are set at 1.6mm.

Nigel


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27-02-07 17:40:55

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Re: Tyre Wear Indicators




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#2 27-02-07 18:28:48

captainhook
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Re: Tyre Wear Indicators

They should be set at 1.6mm mate as that is the limit. I am a city and guilds trained fitter for my sins and thats what it always appeared to be when we were testing tyre wear with a tyre guage.


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#3 27-02-07 19:01:57

Disky
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From: Central Scotland
Registered: 10-03-05
Posts: 1,333
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Re: Tyre Wear Indicators

remember,, like speed, the law states that 1.6mm is the LEGAL MINIMUM smile i try to change mine just before it gets to the wear blocks

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#4 27-02-07 19:55:30

captainhook
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Re: Tyre Wear Indicators

Dimmy judging by your site url tires spelt USA way is the american dunlop not the british tyres. So not sure about that-but I will agree that the tread is 1.6 LOL


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#5 27-02-07 20:46:04

Jimothy
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Registered: 19-04-06
Posts: 224

Re: Tyre Wear Indicators

I think that the TWI is set at greater than the legal minimum.

Why not measure the actual depth of tred on a tyre, and the measure the depth to the top of the TWI then subtract one from t'other.

Then you will know hoe much tread is left when it is worn down to the TWI.


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#6 27-02-07 20:48:49

pegasus
Verified Member
From: north west
Registered: 25-02-05
Posts: 3,302

Re: Tyre Wear Indicators

hi

I think that the TWI is set at greater than the legal minimum.

Why not measure the actual depth of tred on a tyre, and the measure the depth to the top of the TWI then subtract one from t'other.

Then you will know hoe much tread is left when it is worn down to the TWI.

But that involves MATHS yikes

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#7 27-02-07 20:59:27

Jimothy
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Posts: 224

Re: Tyre Wear Indicators

but nothing more than simple arithmetic.

yikes


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#8 28-02-07 06:30:28

ExAdiNigel
Member
From: Plymouth, Devon
Registered: 13-12-04
Posts: 4,739

Re: Tyre Wear Indicators

I think that the TWI is set at greater than the legal minimum.

Why not measure the actual depth of tred on a tyre, and the measure the depth to the top of the TWI then subtract one from t'other.

Then you will know hoe much tread is left when it is worn down to the TWI.

Good idea!  Thanks


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#9 28-02-07 06:52:15

captainhook
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Registered: 12-06-06
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Re: Tyre Wear Indicators

Why do you even need to do that-just measure the twi with a guage and that will tell you-dont need any maths then LOL :?


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#10 28-02-07 07:00:28

ExAdiNigel
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From: Plymouth, Devon
Registered: 13-12-04
Posts: 4,739

Re: Tyre Wear Indicators

depends if the side-bars on the guage will fit into the tread.

Nigel


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#11 28-02-07 08:40:20

captainhook
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Re: Tyre Wear Indicators

true big_smile


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#12 28-02-07 08:44:26

kjs
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From: Rossendale Lancashire
Registered: 20-05-06
Posts: 976
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Re: Tyre Wear Indicators

Even if the TWI is set a little bit higher than it should be, dose it really matter?

New tyres average around £30-£35 around here. I think my life is worth a bit more than that !

p.s. there'll be some that says it isn't.  big_smile big_smile

kjs

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#13 28-02-07 16:31:49

ExAdiNigel
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From: Plymouth, Devon
Registered: 13-12-04
Posts: 4,739

Re: Tyre Wear Indicators

I will change my tyres sooner than 1.6mm, but I can't force someone else to do the same!

Nigel


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#14 23-03-07 14:55:36

kev elliott
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Re: Tyre Wear Indicators

In the ADI mag that came this morning IBM have developed a system where silicon chips are embeded in the tyre, as they disappear though wear a sensor detects the tread left and gives a warning. IBM is currently looking for a manufacturer to use the system

#15 23-03-07 18:18:07

Jimothy
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From: Cheshire
Registered: 19-04-06
Posts: 224

Re: Tyre Wear Indicators

I was in my friendly local tyre fitters yesterday.

They confirm that the TWI is 2mm.


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