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 Posted: Mon Dec 26th, 2011 07:09 pm
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Mana: 
In regards the centre 3/4 (75)% rule I normally use the following method;

75 / 100 = 0.75

Look at the tyre width, i.e. 195

195 x 0.75 = 146.25

so the centre 3/4 width is 146.25mm

Just as with the tyre measuring guage some human judgment must take place, this is normally deciding where the centre of the tyre, i.e. the origin actually is!

Common sense normally decides where the centre is and then the 3/4 width can be worked out from that.

Sorry forgot to add the formula:D

Which is an expression of the relationship between quantities as an equality, which is a formula:P

TW = C x n

where;

TW = Tyre width

C = constant, i.e. 0.75

n = number of mm's of the width of the tyre

:D:D

Last edited on Mon Dec 26th, 2011 08:48 pm by

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 Posted: Mon Dec 26th, 2011 12:32 am
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removalizer
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Mana: 
as mentioned before you really need the tyre width measuring kit, I had a VE in the other day authorising a tester for me, and he said this kit was the only reliable way of measuring

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 Posted: Fri Dec 23rd, 2011 09:42 pm
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castrolrob
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Wesley wrote: castrolrob wrote: Wesley wrote:
Hi mark,

there are companies out there who specialise in providing simple to use "vosa approved" tyre width measuring kit

 
so using a piece of A4 is too complex for you guys?god help us.

it all depends on which way you fold it, lol;) no cutting allowed.:P
i have a black belt in origami:Dno need to cut....

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 Posted: Thu Dec 22nd, 2011 12:40 am
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rocky69 wrote:

Where does the dotted RED lines start and finish LOL:D

Stealth, I have a formula for that lol:D

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 Posted: Wed Dec 21st, 2011 11:58 pm
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RFR
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rocky69 wrote:
Simples!!:)

But its not that Simples!!! ;););););):?

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 Posted: Wed Dec 21st, 2011 11:41 pm
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rocky69
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Simples!!:)

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 Posted: Wed Dec 21st, 2011 11:40 pm
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 Posted: Wed Dec 21st, 2011 01:39 am
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markharriers wrote: Sorry to be a huge pain but can anyone tell me in english the tyre law?

Have a read of this link.

http://www.etyres.co.uk/uk-tyre-law

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 Posted: Sat Dec 17th, 2011 03:43 am
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Wesley
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castrolrob wrote: Wesley wrote:
Hi mark,

there are companies out there who specialise in providing simple to use "vosa approved" tyre width measuring kit

 
so using a piece of A4 is too complex for you guys?god help us.

it all depends on which way you fold it, lol;) no cutting allowed.:P

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 Posted: Fri Dec 16th, 2011 11:43 pm
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castrolrob
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Mana: 
Wesley wrote:

Hi mark,

there are companies out there who specialise in providing simple to use "vosa approved" tyre width measuring kit

 
so using a piece of A4 is too complex for you guys?god help us.

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 Posted: Thu Dec 8th, 2011 05:06 am
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Wesley
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markharriers wrote: Sorry, i no about the different tread depths what i struggle to get my head round is what part of the tyre has to be low to fail. The way i think is on a average tyre the two outer edges dont matter but the centre tread pattern has to be 1.6mm or over all accross the tread pattern all round the tyre?

Hi mark,

there are companies out there who specialise in providing simple to use "vosa approved" tyre width measuring kit to determine, the central 3 quaters of the tread.;)

as "rocky69", posted. be careful about any part of the tread, that from new was not manufactured/produced to the same depth as the main tread.;)

ps; no cutting allowed.;) 

 

Last edited on Thu Dec 8th, 2011 05:15 am by Wesley

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 Posted: Wed Dec 7th, 2011 12:34 am
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rocky69
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Mana: 
Thats about right 1.6 mm accross the centre 3 quarters, but be careful about any part of the tread that from new was not cut to the same depth as the main tread. As aguide any part with a wear bar indicator is usaully part of the measured tread. I feel a big disscusion comming on!!:D:D:D:D

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 Posted: Tue Dec 6th, 2011 12:53 am
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markharriers
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Sorry, i no about the different tread depths what i struggle to get my head round is what part of the tyre has to be low to fail. The way i think is on a average tyre the two outer edges dont matter but the centre tread pattern has to be 1.6mm or over all accross the tread pattern all round the tyre?

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 Posted: Mon Dec 5th, 2011 11:52 pm
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kit1958
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Mana: 
Tyres are quite a confusing subject as Stealth has posted there are different rules for different class of vehicle, so more details please. In the meantime have a look at this http://www.transportoffice.gov.uk/crt/doitonline/bl/mottestingmanualsandguides/mottestingmanualsandguides.htm

Hope that helps

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 Posted: Mon Dec 5th, 2011 05:21 pm
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Stealth
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markharriers wrote:
Sorry to be a huge pain but can anyone tell me in english the tyre law?

A bit more detail would help Mark - the law is different depending on class of vehicle ?

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 Posted: Mon Dec 5th, 2011 01:34 pm
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markharriers
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Sorry to be a huge pain but can anyone tell me in english the tyre law?

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