Line on Tyres

[fazerbill]

What do yous think this line on both back and front tyres is about. I have had this for at least a 1000miles and its still there.
Nothing touching the tyres apart from the road contact of course. If you drag your fingernail over it you can just feel it slightly.
Is it a joint in the compound, faulty tyres or what ?????
Tyres have done 1600miles now and the pic is of the rear.

 

[Deleted account 181015003]

What do yous think this line on both back and front tyres is about. I have had this for at least a 1000miles and its still there.
Nothing touching the tyres apart from the road contact of course. If you drag your fingernail over it you can just feel it slightly.
Is it a joint in the compound, faulty tyres or what ?????
Tyres have done 1600miles now and the pic is of the rear.

Are they Michelin if so I have had some the same and its normal

 

[cusi]

It is an anti-static strip.

 

[fazerbill]

It is an anti-static strip.

Thats a good un

 

[fazerbill]

Yep they are Michelin Anakees

 

[Jumblemo]

Oh god, don't feed the trolls.

 

[DING-DONG]

Pilot rd4 do the same nowt to worry about.

 

[cbrgaz]

I have those tyres on my bike and have the same line, its never bothered me.

 

[cusi]

Oh god, don't feed the trolls.

'tis true you luddite.

 

[Nutty]

Mine have that, I asked the dealer when I was last in there, and they said that's where the tyres are bonded. Nothing to worry about. Several mates on a mixture of bikes and tyres all have the same lines.

 

[fazerbill]

Mine have that, I asked the dealer when I was last in there, and they said that's where the tyres are bonded. Nothing to worry about. Several mates on a mixture of bikes and tyres all have the same lines.

Cheers for the input guys
All the bikes I've had through out the years and I have never came across it till now.

 

[Ash700]

It's just a joint seam, quite normal now in modern day tyre production. It all occurs inside the high pressure, heated mould/press when different sections of the tyre are vulcanised together.

 

[batman1]

My mate and I have it on our factory lowered bikes with the Anakee 3's but I didn't have it on my previous normal height bike with the same tyres, it intrigues me but doesn't bother me!

It's good to know that we are not alone!

 

[Greg Masters]

Joint seam indeed.

Ensure that your tyres rotate in the correct direction so that the joint doesn't become unravelled.

 

[batman1]

Guys, After contacting James in Technical at Michelin, I think that we can safely consider that this (below) is the definitive answer, which some of the brighter members of this forum have already posted correctly.........

Kev,

Thanks for your mail, I had a quick look at the thread on the forum - I can assure you it isn't where the tyre is joined together.

The correct answer (as some have mentioned) is:

Anti Static Strip (sometimes called a 'zebrure')

When a motorcycle is in use there is a build up of static within the machine. It is necessary to ensure that this is dispersed during usage. In order to facilitate this there is a carbon black strip built into the tyre during manufacture. This strip is moulded into the tyre before curing using carbon, as this is a good conductor of static electricity. This strip is practically invisible on a new tyre, but can appear as the tyre wears, especially if the usage of the motorcycle is not high. There is no detrimental effect on the performance of the tyre either before, during or after this strip has become apparent. The positioning of this groove is slightly ‘off centre’.



Feel free to post the address [email protected] if anyone does have any future Michelin tyre queries they want to pose.

Also, in terms of the comments about 'mould marks/join marks' tyres are made 'flat' and shape is formed later:

http://www.youtube.com/watch?v=nFLQU17e31M

Thanks, Best Regards & Ride safely!

james
Michelin
James Dimmock
Marketing Manager
UK, ROI, Nordics & Russia

 

[fazerbill]

Brilliant, thought the anti static strip was a joke made by cusi member. My apologies to cusi

 

[Greg Masters]

A bit of confusion here. The above is the zébrure.

I thought your picture was showing a line going ACROSS the tyre.

 

[madmartin]

A bit of confusion here. The above is the zébrure.

I thought your picture was showing a line going ACROSS the

Jesus man. Scrap it....

 

[Bendy toy]

Especially if the front is more than. 1/2 worn. Can't be too careful.