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Bridgestone 092 Tyre Defect = MOT Failure!

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porndoguk
Renault 5 Driver



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PostPosted: 21:26 - 21 Jul 2012    Post subject: Bridgestone 092 Tyre Defect = MOT Failure! Reply with quote

i dotn post often im a lurker and chip in with the odd bit of rubbish here and there however i thought id share this with the masses to get a general consesus on the issue in hand

well the NC30 went in for MOT today and i thought all was well BUT,

he noticed the cords were coming out the tyre he said, i thought WTF its only done a few 1000s miles its well within the limit (4mm) well it turns out that there are cords are in the surface of the tyre in one small bit enough for him to fail it apparently, a cord was pulled out where the line is. i assume it could be just a few loose fibres not really cause for panic or concern that were in the mould, but its also 5mm near the compound change on the side walls see the dotted line of chalk i did,

pics attached, ps sorry for the repetative images its just different angles and light hopefully to catch the best the eye can see, this has to be seen by the eye really.

https://i107.photobucket.com/albums/m302/porndoguk/temporary-54.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-55.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-56.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-57.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-58.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-59.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-60.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-61.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-62.jpg
https://i107.photobucket.com/albums/m302/porndoguk/temporary-63.jpg

also the advisorys were:
The rear brake being wank a common thing for the NC, despite a FULL overhaul new juice, seals and pistons and new pads and goodridge hose and master cylinder overhauls i really cannot do anymore?

The front brake pulsating under heavy load, i put that down to the smaller NC30 Master Cylinder and CBR600RR calipers

and STIFF steering - ill put that down to the steering damper.
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Frost
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PostPosted: 21:52 - 21 Jul 2012    Post subject: Reply with quote

stiff steering might be over tightened head bearings or something catching somewhere. take the damper off and try it.
Rear brake will be air in the line.
Pulsating lever or due to warped / uneven discs not really cylinder size.

Is the cord removable from the tire? If not I'd be sending that tire back to quality control for a refund.
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G
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PostPosted: 22:44 - 21 Jul 2012    Post subject: Reply with quote

Or wheel bearings going for the brake. Shouldn't be anything to do with ratios or types of brake.
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Hyaon
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PostPosted: 22:55 - 21 Jul 2012    Post subject: Reply with quote

Saddest tyre I've ever seen...poor mite.

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sickpup
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PostPosted: 00:38 - 22 Jul 2012    Post subject: Reply with quote

The tyre isn't defective, it has a deep slash that has severed and exposed the cords. I recommend you change it asap and don't ride on it.
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symonh2000
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PostPosted: 09:18 - 22 Jul 2012    Post subject: Reply with quote

sickpup wrote:
The tyre isn't defective, it has a deep slash that has severed and exposed the cords. I recommend you change it asap and don't ride on it.


That is what I thought at first, but it also looks like it could have a stray piece of cord embedded in the rubber near the surface which has exposed itself due to wear.

It is difficult to see how deep the slash is on the photo.
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DrDonnyBrago
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PostPosted: 09:26 - 22 Jul 2012    Post subject: Reply with quote

sickpup wrote:
The tyre isn't defective, it has a deep slash that has severed and exposed the cords. I recommend you change it asap and don't ride on it.


I'm not convinced. In the photo below, you can see what looks like the pattern of a twisted bit of cord cast into the rubber. As if a bit of stray cord was embedded into the rubber during manufacture and has since been pulled out, leaving a castedrecess.

https://i107.photobucket.com/albums/m302/porndoguk/temporary-57.jpg
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sickpup
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PostPosted: 10:01 - 22 Jul 2012    Post subject: Reply with quote

symonh2000 wrote:
It is difficult to see how deep the slash is on the photo.


So how deep is the slash? I estimate about 5mm.

I think it would be easier to tell with the tyre off the rim.

It's not really possible to have a stray cord on the surface. The cords are in the carcass with the tread a separate skin of rubber overlaid so there are in fact no cords in the tread. If it was a stray thread from the carcass it would still be under the tread and could only get out if the slash went down to the carcass.
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DrDonnyBrago
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PostPosted: 10:17 - 22 Jul 2012    Post subject: Reply with quote

sickpup wrote:
It's not really possible to have a stray cord on the surface. The cords are in the carcass with the tread a separate skin of rubber overlaid so there are in fact no cords in the tread. If it was a stray thread from the carcass it would still be under the tread and could only get out if the slash went down to the carcass.



I think he means, and what I think it looks like, is a stray cord (not from that tyre) from the factory seems to have found it's way into the rubber overlay prior to moulding and vulcanisation. Of course a big gash could also chuck up a cord from the carcass, but it doesn't look like that has happened.

i.e. The long strip of soft rubber that is wound around the carcass before the tyre is moulded/heated seems to have had a bit of cord in it.
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Polarbear
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PostPosted: 12:43 - 22 Jul 2012    Post subject: Reply with quote

^^^^
Agree

It does look rather like an embedded bit of cord. I would have thought if the cut was deep enough to cut the cord and allow a strand to the tyre surface it would have deflated or blown out.
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sickpup
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PostPosted: 13:26 - 22 Jul 2012    Post subject: Reply with quote

Polarbear wrote:
^^^^
Agree

It does look rather like an embedded bit of cord.


The it will pull out with a pair of pliers. Highly unlikey.
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DrDonnyBrago
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PostPosted: 16:18 - 22 Jul 2012    Post subject: Reply with quote

Barnaby wrote:
Bridgestone can't make tyres


Correct:

https://topsportracing.com/wp-content/uploads/2012/07/Rossis-tire-at-Assen.jpg
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porndoguk
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PostPosted: 18:32 - 22 Jul 2012    Post subject: Reply with quote

Thanks for the comments,

As i said above it really needs to be seen by the eye, it isnt a GASH as much as i love to hear and say it on this occasion it is not, see the loose bits of rubber that is from where a piece of cord was removed, hence the loose bits where it is spun at the factory.

The groove isn't straight, it also isnt a full groove there are peaks and lows, i inflated the tyre to 60psi with my compressor to see if the GASH would expand it didnt.

I will after ive heard from bridgestone, depending on there reply cut away slowly at the surface with my dremmel to show this is a fuck up.

yes im best off taking the tyre off again to prove it isnt a GASH as ill be able to bend and manipulate the tyre
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AlexW
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PostPosted: 18:59 - 22 Jul 2012    Post subject: Reply with quote

I would imagine if bridgestone take it seriously, they would want you to remove the tyre and send it to them so they can check it, rather than go on what somebody with a dremel is saying at the end of the phone.

Be good to know the outcome though!
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porndoguk
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PostPosted: 19:21 - 22 Jul 2012    Post subject: Reply with quote

AlexW wrote:
I would imagine if bridgestone take it seriously, they would want you to remove the tyre and send it to them so they can check it, rather than go on what somebody with a dremel is saying at the end of the phone.

Be good to know the outcome though!


i get what your saying, the dremmel operation was only if bridgestone told me to do one Wink

i would of course photo all of it to prove this is a defect,

ive eyed up a set of 090's for 169.40 delivered, its a shame the NC has a 18" rear as im stuck to one brand with the bike
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c-m
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PostPosted: 20:58 - 22 Jul 2012    Post subject: Reply with quote

This is exactly what happened to my Diablo Super Corsa front back in Split. I still rode it to Belgium before it blew.

knowing that now I'd be changing that tyre asap. You MOT guy is correct.
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porndoguk
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PostPosted: 22:12 - 22 Jul 2012    Post subject: Reply with quote

Thanks for the comments,

As i said above it really needs to be seen by the eye, it isnt a GASH as much as i love to hear and say it on this occasion it is not, see the loose bits of rubber that is from where a piece of cord was removed, hence the loose bits where it is spun at the factory.

The groove isn't straight, it also isnt a full groove there are peaks and lows, i inflated the tyre to 60psi with my compressor to see if the GASH would expand it didnt.

I will after ive heard from bridgestone, depending on there reply cut away slowly at the surface with my dremmel to show this is a fuck up.

yes im best off taking the tyre off again to prove it isnt a GASH as ill be able to bend and manipulate the tyre
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iooi
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PostPosted: 09:13 - 23 Jul 2012    Post subject: Reply with quote

I would get the wheel off. Then ring bridgestone and ask which local dealer would be best to take this too, for them to look at.
Failing that take it back to the dealer that fitted it.

Clearly you don't want to be riding on that tyre or taking anything to it, that will allow bridgestone a easy out.
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Andy_Pagin
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PostPosted: 10:58 - 23 Jul 2012    Post subject: Reply with quote

+1 to above post. Contact Bridgestone, they'd most likely be keen to know about a manufacturing fault in a tyre. I've reported faulty goods directly to manufacturers before (albeit just supermarket shopping stuff) and quite often got a nice little prezzie or two back in gratitude.
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porndoguk
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PostPosted: 07:01 - 24 Jul 2012    Post subject: Reply with quote

I spoke to a nice chap at bridgestone called gary, there policy seems a bit shit tbh, and in interest to PR this to is shit, i was told IF it is faulty they will refund a percentage of the tyre down to the usage, i worked out ive done 1590miles since fitted, no burn outs, heavy braking etc so whatever wear its had is beyond me, ive ordered a set of 090s and will get them on as soon as they are here, i then have to send it back to bridgestone be butchered.
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CaNsA
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PostPosted: 07:26 - 24 Jul 2012    Post subject: Reply with quote

Why did you stick with bridgestone rubber?

Michelin and Dunlop are far better......
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UnspeedySam
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PostPosted: 07:44 - 24 Jul 2012    Post subject: Reply with quote

CaNsA wrote:
Why did you stick with bridgestone rubber?

Michelin and Dunlop are far better......


Awkward 18" wheel sizes. My bros has a similar problem which is why it runs bt45s.
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iooi
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PostPosted: 08:37 - 24 Jul 2012    Post subject: Reply with quote

CaNsA wrote:
Why did you stick with bridgestone rubber?

Michelin and Dunlop are far better......


Not always the case.

Diffrent bikes, diffrent people. Prefer diffrent rubber Thumbs Up

Crap policy by Bridgestone. You would think that if it was a manufacturing fault they would simply replace FOC. Not pussy foot around looking at how many mile it has done and then refunding that amount.

I would go back and ask to speek to someone higher and point out, had it have gone while riding they would be looking at a much larger payout....
As such as a good will gesture will they sort out a replacement and free fitting at a local dealer.
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sickpup
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PostPosted: 09:43 - 24 Jul 2012    Post subject: Reply with quote

CaNsA wrote:
Why did you stick with bridgestone rubber?

Michelin and Dunlop are far better......


That'll be why Michelin paid me out £2000 for a defective tyre then....
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