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acki
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PostPosted: 17:26 - 29 Jun 2022    Post subject: Tyre issue Reply with quote

Hello,

I've recently got a Bridgestone BT45F front tyre,
and 1500km later I noticed what looks like a a strange continuous cut or seam all around the tyre, about 3/2 across. I'm not sure what to make of this; if this is a material failure, and if this is a safety issue at all... ?

I attached some images...

Any thoughts?
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Freddyfruitba...
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PostPosted: 18:12 - 29 Jun 2022    Post subject: Reply with quote

Looks like a slot/cut - how deep is it, in the top of the treaded area? It seems odd that the cut extends to the bottom of the treads. Is the cut the same depth in both areas?
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doggone
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PostPosted: 18:17 - 29 Jun 2022    Post subject: Reply with quote

Thinking how they are constructed it is hard to imagine a fail like that, perhaps a sharp object got caught under mudguard - any trace of damage there?
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acki
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PostPosted: 18:18 - 29 Jun 2022    Post subject: Reply with quote

Hi Freddy,

The cut is the same depth all around the tyre. I would say it’s about the same depth as the treads.
It’s a continuous cut all around. So I guess it’s a manufacturing issue.
It could be fine I just never noticed anything like this in any other tyre.
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jaffa90
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PostPosted: 18:24 - 29 Jun 2022    Post subject: Reply with quote

In 50+ years buying tyres i`ve never seen a tyre looking like that and would not trust it. Q, why the BT46 stamp? Was it a Rossi reject?
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acki
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PostPosted: 18:33 - 29 Jun 2022    Post subject: Reply with quote

On second inspection: it's slightly deeper than the tread; photo attached. Nothing sharp under the mud guards.

I got the tyres while in France from a place that was recommended by the local Moto Guzzi concession holder (my bike is a Guzzi).
My old tyres were completely gone... But this was the only tyre I was able to get... For some reason there is a huge tyre supply chain issue in France...

What's a Rossi reject?
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Kawasaki Jimbo
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PostPosted: 19:12 - 29 Jun 2022    Post subject: Reply with quote

It’s an antenna tread.

https://www.cambriantyres.co.uk/dark-line-around-motorcycle-tyre/

Quote:
Motorcycle tyres have a lot of different materials used in their compounds, and one of those materials is silica. The use of silica in a tyre’s rubber compound helps to improve warm-up times, and therefore improve grip in both cold and wet conditions. The only problem with silica is it’s a very good electrical isolator.

Silica rich compounds build up a static electrical charge as you ride. On occasion this can be enough to give you a small electrical shock as your foot hits the ground, giving the electrical charge a route to earth.

This thin dark line is a silica free band of “antenna tread” which actually helps to dissipate the static electricity as you ride, rather than letting it build up to give you a nasty shock at the next junction or set of traffic lights.
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Nobby the Bastard
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PostPosted: 19:24 - 29 Jun 2022    Post subject: Reply with quote

Has the op actually tried to probe the depth away from the tread or is op just assuming it's deeper because they can see a dark line at the bottom of the tread?
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stinkwheel
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PostPosted: 19:35 - 29 Jun 2022    Post subject: Reply with quote

Is there an actual slit there, so is it an actual gap in the tread?

If it is, I wouldn't trust it. As I recall they are dual compound bias belt tyres and it might be the two compounds have failed to join properly.
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acki
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PostPosted: 19:50 - 29 Jun 2022    Post subject: Reply with quote

There is an actual slit.
It's not just a dark line...
I'll get in touch with Bridgestone.
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steve the grease
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PostPosted: 20:11 - 29 Jun 2022    Post subject: Reply with quote

If it was a cut by a protruding bolt or bit of metal it would be a straight line , not all wiggley. At the bottom of some of the tread grooves , in line with the 'cut' is there not some yellow paint or something like that, suggesting that whatever has happened has taken place at the manufacturing stage. Warrenty claim!
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acki
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PostPosted: 20:19 - 29 Jun 2022    Post subject: Reply with quote

Yep, there is a yellow line/dots
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WD Forte
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PostPosted: 20:37 - 29 Jun 2022    Post subject: Reply with quote

I has a thought.
1500km nearly 1000 miles and it looks like you've yet to
go around a corner. Very Happy

That looks like a faulty tyre to me but why and how it got
like that is a mystery
Sabotage?

incidentally
here's a BT45 on a Guzzi for reference

https://img2.indafoto.hu/1/1/160395_3bb1a24af88d0872087a525e8a07d4d2/18684733_7044514898e984a25c343f010458614c_l.jpg
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Bhud
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PostPosted: 21:32 - 29 Jun 2022    Post subject: Reply with quote

At a guess, it looks like a manufacturing defect. It's roughly equidistant all the way around, from the centre part from the tread. While at a glance it may look randomly squiggly, upon closer inspection it bulges out then turns back at the same place wherever a tread lines repeats, i.e. the squiggles appear to have some regularity.

In France they ride on the right-hand side of the road. Therefore, when you're riding in a straight line, there is a camber in the road angling down to your right. That tyre having been constructed for the French market probably is made of 2 compounds, to compensate for the increased wear just offset from the centre of the tyre's tread, i.e. where your squiggly line is.

That particular tyre is a well-proven tyre from a good manufacturer, and is not known for splitting along a seam. The original (old style) Avon Roadriders sometimes used to split. To the best of my knowledge, Avon corrected that defect years ago.

What is the date of manufacture on that tyre? It would be interesting to see what Bridgestone have to say about it.
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acki
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PostPosted: 22:24 - 29 Jun 2022    Post subject: Reply with quote

Thanks everyone,

I'll pass by a Bridgestone dealer tomorrow.
And yes, little cornering so far on 1500km of French motorways,
hoping to make up for that in the summer months.
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MCN
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PostPosted: 18:42 - 03 Jul 2022    Post subject: Reply with quote

It looks like you have rolled over something sharp and rounded.
It cut the tyre.
Was dislodged and rolled into a fresh section of tread and so on until is was shat out or disintegrated.
If it qas from the manufacturing process then the 'cut'/line would be more precisely demarkated on the tyre tread.
That line is not straight so more than likely not a tyre fault per se.

Take it to a bike tyre specialist for a 2nd opinion.
But... be prepared for bad news. It is very difficult to determine the extent of injuries in tyres (without x-ray of destructive examination.)
It more that probably wont fail catastrophically but I would not give any guarantee on that without some close inspection.
Rubber tears as soon as it is cut. The stresses on the tyre exacerbate that.
A shop more often will err on caution. Not to get a sale bit to ensure a safe margin.

They may demount and check the inner surcace or may just say to buy a new one.
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Kawasaki Jimbo
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PostPosted: 18:56 - 05 Jul 2022    Post subject: Reply with quote

Was I right?
Very Happy
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Domino59
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PostPosted: 09:41 - 08 Jul 2022    Post subject: Reply with quote

My guess is whoever unpacked the tyre used a box cutter or some other sharp knife to cut through the plastic wrapping.
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tsuleiman
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PostPosted: 13:00 - 08 Jul 2022    Post subject: Reply with quote

Hi Guys,

please has anyone got an idea on where i can get a rear rim for my HONDA CD250U RIM SIZE - 2.15 x 17
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A100man
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PostPosted: 13:10 - 08 Jul 2022    Post subject: Re: Tyre issue Reply with quote

acki wrote:
Hello,

I've recently got a Bridgestone BT45F front tyre,
and 1500km later I noticed what looks like a a strange continuous cut or seam all around the tyre, about 3/2 across. I'm not sure what to make of this; if this is a material failure, and if this is a safety issue at all... ?

I attached some images...

Any thoughts?


Are you a lady or were you fresh form the manicurist's?
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stinkwheel
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PostPosted: 13:13 - 08 Jul 2022    Post subject: Reply with quote

tsuleiman wrote:
Hi Guys,

please has anyone got an idea on where i can get a rear rim for my HONDA CD250U RIM SIZE - 2.15 x 17


Try. https://www.central-wheel.co.uk
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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acki
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PostPosted: 16:45 - 10 Jul 2022    Post subject: Reply with quote

Kawasaki Jimbo wrote:
Was I right?
Very Happy


You were... Bridgestone confirmed it's an anti-static lead.
Never seem any like this one before though...
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jaffa90
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PostPosted: 17:13 - 10 Jul 2022    Post subject: Reply with quote

acki wrote:
Kawasaki Jimbo wrote:
Was I right?
Very Happy


You were... Bridgestone confirmed it's an anti-static lead.
Never seem any like this one before though...


Smart *rse, K,J. Laughing
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Kawasaki Jimbo
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PostPosted: 17:17 - 10 Jul 2022    Post subject: Reply with quote

jaffa90 wrote:
Smart *rse, K,J. Laughing

I thought I’d been ignored. Crying or Very sad
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