Stretched Tyres now MOT Fail

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Stretched Tyres now MOT Fail

Post by marco_polo » Mon Jan 04, 2016 9:49 am

Rob180bhp announced yesterday that stretched tyres are now an MOT fail.

I'm regularly PM'd by members wanting wheel and tyre advice, so need to know how stretched is 'MOT stretched' to avoid giving poor (and very expensive) info.

Anyone know the measurements, guidelines, percentages, etc?

Or will they simply go by ETRTO recommendations?
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Re: Stretched Tyres now MOT Fail

Post by Sonic1506 » Mon Jan 04, 2016 9:58 am

I believe it becomes an MOT fail when the beads are showing where the tyre is over stretched. Else it's down to the tester/advisory given.

https://mattersoftesting.blog.gov.uk/st ... t-failure/" onclick="window.open(this.href);return false; <- all the info is here.
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Re: Stretched Tyres now MOT Fail

Post by dj_troopa » Mon Jan 04, 2016 10:10 am

What Sonic said ^^^ saw that the other day and is a very good read for those concerned about stretch.
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Re: Stretched Tyres now MOT Fail

Post by marco_polo » Mon Jan 04, 2016 10:15 am

I think I'll stick to the narrowest ETRTO recommends from now on, at least that will keep hoards of angry Euro Boys from my door!

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Re: Stretched Tyres now MOT Fail

Post by johnwhalley » Mon Jan 04, 2016 10:27 am

Cannot say I am surprised at this news. Apart from looking wrong, stretching beyond manufacturers recommended limits is potentially unsafe. Or do those with excessively stretched tyres drive slowly - the whole thing being the look, not the effectiveness?

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Re: Stretched Tyres now MOT Fail

Post by Sonic1506 » Mon Jan 04, 2016 10:33 am

johnwhalley wrote:Cannot say I am surprised at this news. Apart from looking wrong, stretching beyond manufacturers recommended limits is potentially unsafe. Or do those with excessively stretched tyres drive slowly - the whole thing being the look, not the effectiveness?
Stretch is used to fit wider wheels on cars due the law stating that the wheel cannot protude past a certain limit AND tread needs to be under the arch. Hence stretch to keep said tread under the arch and only poking side wall/bit of the rim to the limit which I believe is 30mm protrusion from the edge of the arch be it rim/sidewall. I don't drive fast anyway, I'm more of a cruiser.

I have stretch tyres on my own car but even then it is minimal (205/35 on a 8 and 215/40 on 9). The reason I went for it is the look.

https://tyrestretch.com/8.0-205-35-R18/" onclick="window.open(this.href);return false;

https://tyrestretch.com/9.0-215-40-R18/" onclick="window.open(this.href);return false;

Not my images but to give you an idea of the stretch I have. Pretty sure come MOT time I'd be fine.
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Re: Stretched Tyres now MOT Fail

Post by rob180bhp » Mon Jan 04, 2016 10:37 am

Unfortunately is down to each tester to determine weather it's a stretch or not, it's going go be a nightmare

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Re: Stretched Tyres now MOT Fail

Post by Sonic1506 » Mon Jan 04, 2016 10:41 am

rob180bhp wrote:Unfortunately is down to each tester to determine weather it's a stretch or not, it's going go be a nightmare

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What an unacceptable stretched tyre looks like

We’ll give you an extreme example in this case. The side of the tyre bead (1) is exposed and the lower edge of the tyre bead (2) is sealed on the rim where (1) should be. This is because the tyre is over-stretched.

Image
Diagram of an incorrectly seated stretched tyre.

When this happens, the vehicle should be rejected for the tyre being incorrectly seated on the wheel rim. Where this isn’t obvious, the nominated tester should pass and advise.
Slight stretch will be down to the tester as it always has been. Massive stretch will be a fail like it has been.
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Re: Stretched Tyres now MOT Fail

Post by seanklein » Mon Jan 04, 2016 10:48 am

I always stick to the smallest size within the guidelines. 225 on an 8j rim, 245 on a 9j rim. A aesthetically pleasing amount of stretch without going stupid :)
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Re: Stretched Tyres now MOT Fail

Post by Sonic1506 » Mon Jan 04, 2016 10:50 am

seanklein wrote:I always stick to the smallest size within the guidelines. 225 on an 8j rim, 245 on a 9j rim. A aesthetically pleasing amount of stretch without going stupid :)
What profiles have you got?
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Re: Stretched Tyres now MOT Fail

Post by seanklein » Mon Jan 04, 2016 11:49 am

Sonic1506 wrote:
seanklein wrote:I always stick to the smallest size within the guidelines. 225 on an 8j rim, 245 on a 9j rim. A aesthetically pleasing amount of stretch without going stupid :)
What profiles have you got?
225 40, 245 35. Considering width is within guidelines I'd say the rolling radius affecting the speedo will be negligible.
BMW 135i N54 - GTX3582R Single Turbo.
Dyno numbers..
Twins - 495hp 574 ft/lbs @ 19 psi (5000rpm)
Single - 587hp 520ft/lbs @ 20 psi...To the redline! :twisted:

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Re: Stretched Tyres now MOT Fail

Post by Kerr » Mon Jan 04, 2016 12:04 pm

It's a practice I've never understood, especially on more powerful cars.

I want as much grip as I can get, not fitting skinny tyres as they think they look better.

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Re: Stretched Tyres now MOT Fail

Post by Sonic1506 » Mon Jan 04, 2016 12:06 pm

Kerr wrote:It's a practice I've never understood, especially on more powerful cars.

I want as much grip as I can get, not fitting skinny tyres as they think they look better.
BMW used to stretch tyres on the E9x M3 (mainly the rear) if I'm not mistaken and do the same with the M4 again if I'm not mistaken. My buddies M4 that he recently bought from BMW has slight stretch on the rear.

This looks epic though:

Image

:roll: :roll: :roll: :roll:.

There is a fine line between tasteful/safe stretch and stupid/unsafe stretch IMO.
Last edited by Sonic1506 on Mon Jan 04, 2016 12:09 pm, edited 1 time in total.
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Re: Stretched Tyres now MOT Fail

Post by rob180bhp » Mon Jan 04, 2016 12:08 pm

But at what point is it an MOT fail?

It will be down to each tester

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Re: Stretched Tyres now MOT Fail

Post by Sonic1506 » Mon Jan 04, 2016 12:12 pm

rob180bhp wrote:But at what point is it an MOT fail?

It will be down to each tester

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Retard stretch where you can see the beads WILL be a fail as it always has been. Slight stretch will most likely be a pass but this is down to the tester to pass it, fail it or put it down as a pass/advisory. The law on stretch has been a grey area for a while, now concrete legislation is coming into place.

I'd expect retard stretch like this, will fail:

Image

I'd expect stretch like this, will pass:

Image
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