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Tea_and_Biology

Member Since: 03 Jun 2024
Location: Oxford
Posts: 11

2007 Defender 110 Puma 2.4 XS CSW Aintree Green

Failed MOT - Tyre Bulge

Just had the MOT done at Halfords; clean bill of health except failed for:

Tyre has a bulge, caused by separation or partial failure of its structure Offside Front (235/85/16)

The bulge isn't localised, rather presents at the bottom of the tyre whenever it's parked due to gravity. I have radial BFGoodrich All Terrain T/A KO2 235/85 R16's fitted; my understanding is they're supposed to bulge slightly at the bottom with the flexible sidewalls. Both front ones do this a little, but they only picked up nearside. Perhaps pressure was a little too low? PSI is at the manufacturer's recommended standard 28 PSI (for 205/80/R16) for the front, 35PSI rear, anywo.

There's otherwise no split or anything else visually wrong with them (they're fairly new, less than a year old).

Anywho, changed to the spare in the meantime, just in case, but my question really is whether it's likely there's genuine issue with the tyre? Do other folks' Landys present as similar?

Pics attached; thanks!

Click image to enlarge

31st Oct 2024 4:31pm

Mdm

Member Since: 11 Sep 2013
Location: Sunny Lancashire
Posts: 1599

i dont see any issue but the tester should chalk the fail point for you?

31st Oct 2024 4:51pm

DAZ110

Member Since: 06 Dec 2007
Location: East Sussex
Posts: 2038

2013 Defender 90 Puma 2.2 XS CSW Barolo Black

You say you have BFGoodrich All Terrain tyres but your photos are of General Grabbers...

Looks like a BFG on the back of the vehicle though.

But the front tyres in the photos look ok to me, at least on the outside.

Last edited by DAZ110 on 31st Oct 2024 5:42pm. Edited 3 times in total

31st Oct 2024 5:32pm

MarkBrown

Member Since: 03 Oct 2022
Location: Mid Wales
Posts: 462

1983 Defender 110 Other HT Auto Keswick Green

Looks ok, but could be a lump on the inside perhaps? I had a car tyre fail like that, got a new set. You could take it to a tyre place and they’ll take it off to check inside. 1983 110 automatic OM606

31st Oct 2024 5:37pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20355

I think the front needs to be at least F32 and rear R36. (Psi)

On a 110, possibly a little more approx 38R on the rear depending on load or towing.

I think that it is, under pressure, and the fact the tester noticed the different tyres front and rear.

I run on 34F & 36R on a 90.

With under pressure the tyre sidewall will bulge, but if there is a delimitation that could be on the inside of the tyre not seen.

The no cuts or bulges stipulation, is usually a bulge in a specific location such as an air leak from underneath various laminations, which then bulges on the outer lamination, which is a big blowout risk, but from those photos they look perfectly okay and normal from those angles.

Have you had a look at the inside of the tyre?

https://www.kwik-fit.com/tyres/information/tyre-pressure-search#

31st Oct 2024 6:16pm

Notyalc

Member Since: 27 Jul 2018
Location: Northumberland
Posts: 160

I would not class that as a bulge. It’s deflection due to load which i cannot see being a fail.

To me a bulge is a loacalised deformation - think of a blister caused by a rupture in the sidewall.

I dont see any such damage

31st Oct 2024 7:32pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17373

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Jack the wheel up off the ground and see if you still have a bulge. If you do then get a new tyre. If you don't then get a new MOT tester.

I find it hard to believe that even somewhere as shoddy as Halfwits would call what you've photographed a bulge.

31st Oct 2024 8:35pm

DSC-off

Member Since: 16 Oct 2014
Location: North East
Posts: 1402

2015 Defender 110 Puma 2.2 XS CSW Aintree Green

There's otherwise no split or anything else visually wrong with them (they're fairly new, less than a year old).

Are you sure on the age?
The Front Offside tyre appears to have a manufacture date of week 04-2008. Almost 17 years?

31st Oct 2024 9:18pm

jbcollier

Member Since: 29 Apr 2024
Location: Edmonton AB
Posts: 84

2009 Defender 110 Puma 2.4 SW Alpine White

The bulge at the "bottom" is not what they are concerned about. Jack up the suspect wheel, spin it while feeling along the sidewall. If the tire has separated, there will be a radial bulge. It is usually easy to find.

1st Nov 2024 4:11am

revd

Member Since: 20 Apr 2024
Location: England
Posts: 116

17 year old tyres - I would replace regardless

1st Nov 2024 8:20am

Chicken Drumstick

Member Since: 17 Aug 2020
Location: Near MK
Posts: 722

Re: Failed MOT - Tyre Bulge

Tea_and_Biology wrote:
Just had the MOT done at Halfords; clean bill of health except failed for:

Tyre has a bulge, caused by separation or partial failure of its structure Offside Front (235/85/16)

The bulge isn't localised, rather presents at the bottom of the tyre whenever it's parked due to gravity. I have radial BFGoodrich All Terrain T/A KO2 235/85 R16's fitted; my understanding is they're supposed to bulge slightly at the bottom with the flexible sidewalls. Both front ones do this a little, but they only picked up nearside. Perhaps pressure was a little too low? PSI is at the manufacturer's recommended standard 28 PSI (for 205/80/R16) for the front, 35PSI rear, anywo.

There's otherwise no split or anything else visually wrong with them (they're fairly new, less than a year old).

Anywho, changed to the spare in the meantime, just in case, but my question really is whether it's likely there's genuine issue with the tyre? Do other folks' Landys present as similar?

MoT centres are required to fail a certain % of vehicles. This means they will sometimes make stuff up. I would be going back to complain and get them to show you exactly where the bulge is and why it is a fail.

And once resolved, use a different garage in the future. The tyre in your photos looks fine otherwise.

1st Nov 2024 11:32am

Chicken Drumstick

Member Since: 17 Aug 2020
Location: Near MK
Posts: 722

revd wrote:
17 year old tyres - I would replace regardless

Why?

1st Nov 2024 11:32am

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209

2007 Defender 110 Puma 2.4 XS CSW Java Black

Something doesn't add up here. As pointed out above, OPs description of the tyres and those in the photos don't match. There's nothing in the photos that would obviously be a fail. The bulge at the bottom due to the weight of vehicle is neither here nor there and not what the MOT is looking for. It should be a bulge in the sidewall indicating the tyres internal structure is compromised. The guidance for MOT testers is:

When assessing lumps or bulges in a radial ply tyre, care should be taken to distinguish between normal undulations in the carcass, resulting from manufacturing, and lumps or bulges caused by structural deterioration.

MOT testers are not required to fail a certain number of vehicles. If everything that turns up passes then they can pass them. What might happen is that if a test centre has an unusually high pass rate, DVSA might come and have a look to see if they are being too lenient or issuing fraudulent tests.

There is no legal maximum age for passenger car tyres (there is for some truck and bus tyres at 10 years), but general industry advice is to replace at 10 years. Tyres suffer from deterioration due to aging, UV an lack of use which can render them more prone to failure. 2007 110 TDCi Station Wagon XS

1st Nov 2024 12:15pm

markb110

Member Since: 22 May 2010
Location: Guildford
Posts: 2634

Well it’s not as if Halfords (and their rebranded National Tyres) don’t have tyres to sell…….

Gotta think of their Xmas bonus……..as if I would be soooooo cynical

1st Nov 2024 12:26pm

revd

Member Since: 20 Apr 2024
Location: England
Posts: 116

Chicken Drumstick wrote:
revd wrote:
17 year old tyres - I would replace regardless

Why?

I would have thought it was obvious

Interestingly a 110 SW with 10/12 seats is classed as a minibus; any tyres over 10 years old would result in a mot fail and an immediate prohibition notice

https://www.consumerreports.org/cro/news/2.../index.htm

extreme example but same principle applies

1st Nov 2024 10:18pm

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