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Proud to be professional
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Posted: Mon Dec 26th, 2011 01:09 pm |
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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
Which is an expression of the relationship between quantities as an equality, which is a formula
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
Last edited on Mon Dec 26th, 2011 02:48 pm by Proud to be professional
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removalizer
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Posted: Sun Dec 25th, 2011 06:32 pm |
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| 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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castrolrob
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Posted: Fri Dec 23rd, 2011 03:42 pm |
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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. i have a black belt in origamino need to cut....
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Proud to be professional
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Posted: Wed Dec 21st, 2011 06:40 pm |
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rocky69 wrote: 
Where does the dotted RED lines start and finish LOL
Stealth, I have a formula for that lol
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RFR
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Posted: Wed Dec 21st, 2011 05:58 pm |
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rocky69 wrote:
Simples!!
But its not that Simples!!! 
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rocky69
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Posted: Wed Dec 21st, 2011 05:41 pm |
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| Simples!!
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rocky69
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Posted: Wed Dec 21st, 2011 05:40 pm |
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Proud to be professional
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Posted: Tue Dec 20th, 2011 07:39 pm |
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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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Wesley
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Posted: Fri Dec 16th, 2011 09:43 pm |
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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.
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castrolrob
Trade Member
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Posted: Fri Dec 16th, 2011 05:43 pm |
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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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Wesley
Trade Member
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Posted: Wed Dec 7th, 2011 11:06 pm |
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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 Wed Dec 7th, 2011 11:15 pm by Wesley
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rocky69
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Posted: Tue Dec 6th, 2011 06:34 pm |
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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!!
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markharriers
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Posted: Mon Dec 5th, 2011 06:53 pm |
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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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kit1958
Trade Member
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Posted: Mon Dec 5th, 2011 05:52 pm |
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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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Stealth
Super Moderator
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Posted: Mon Dec 5th, 2011 11:21 am |
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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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markharriers
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Posted: Mon Dec 5th, 2011 07:34 am |
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| Sorry to be a huge pain but can anyone tell me in english the tyre law?
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