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| Moderated by: tanygaer, Koxxy, derek hendry | Page: 1 2   |
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| How do you tell the age of a tyre? | Rate Topic |
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| Posted: Fri May 21st, 2010 02:14 pm |
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1st Post |
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Lemen Leprechaun Rider 
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All tyres are produced with a serial Tyre Identification Number (or serial TIN) that shows the date of manufacture of a tyre (See Figure 1&2 below). The last three digits (for tyres made pre 2000) or four digits (for post 2000 tyres) of the serial TIN indicate the week and year that the tyre was made. For example, Figure 1 below shows a tyre made in the 37th week of 1995 and Figure 2 shows a tyre made in the 12th week of 2004. Also a tyre made in the 1990's can be distinguished from a tyre made in the 1980's due to a triangular indentation after the last number which is not present on 1980's tyres.  fig.1  fig.2
____________________ Liam ------------------------ Where you find quality, you will find a craftsman, not a quality-control expert. 2000 GL1500SE 1984 GL1200 Aspencade 1979 GS550E |
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| Posted: Fri May 21st, 2010 02:16 pm |
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2nd Post |
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Lemen Leprechaun Rider
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How old is too old? This is a subject of much debate within the tyre industry and no tyre expert can tell exactly how long a tyre will last. However, on the results of experience many tyre companies, including Bridgestone, warrant their tyres against manufacturing and material defects for five years from the date of manufacture. Based on their understanding a number of vehicle manufacturers are now advising against the use of tyres that are more than six years old due to the effects of ageing. Tyre Ageing Mechanism There are three main mechanisms of tyre ageing. The first involves rubber becoming more brittle. Sulphur is used to link rubber molecules together during vulcanisation with the application of heat and pressure, giving the rubber its useful elastic properties and strength. As the tyre absorbs energy in the form of light, heat or movement the tyre continues to vulcanise. This ongoing vulcanisation causes the rubber to become stiffer and more brittle. The second mechanism of tyre ageing is oxidation involving oxygen and ozone from the air compromising the strength and elasticity of the rubber and the integrity of the rubber to steel bond. Basically heat and oxygen cause cross linking between polymer chains (causing the rubber to harden) and scission of polymer chains (leading to reduced elasticity). Thirdly, breakdown of the rubber to steel-belt bond will occur due to water permeating through a tyre and bonding with the brass plate coating on steel belts. This causes the steel to rubber bond to weaken leading to reduced tyre strength and reduced heat resistance. If compressed air used for inflation is not completely dry, tyre strength will be affected over time. Even unused tyres will become more brittle, weaker and less elastic with exposure to water, air, heat and sunlight.
____________________ Liam ------------------------ Where you find quality, you will find a craftsman, not a quality-control expert. 2000 GL1500SE 1984 GL1200 Aspencade 1979 GS550E |
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| Posted: Fri May 21st, 2010 02:41 pm |
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3rd Post |
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Silverfox Liason Officer 
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Thank you Lemen, an interesting read and some good facts too, with the date stamp on tyres.  
____________________ Pete rblr.co.uk Why do today what you can put off 'til tomorrow, when you can be out riding!!! '06 GL1800 Comfort package model. '76 GL1000 Executive model. |
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| Posted: Fri May 21st, 2010 07:31 pm |
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4th Post |
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divie1066 Post Queen 
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Well done that man
____________________ Life is Good well almost!!!!! Jan is the light of my life. A stranger is friend you have yet to meet. |
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| Posted: Fri May 21st, 2010 07:45 pm |
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5th Post |
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Koxxy Doorman 
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Thanks for the info, this will be a useful reference article
____________________ Ian To live is the rarest thing in the world. Most people exist, that is all. GL1500 |
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| Posted: Sat May 22nd, 2010 04:00 am |
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6th Post |
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Motorcycle Pete Colonial Rider
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I do wonder if anyone out there has input though, about a never used tyre, that has been stored in the dark, in a dry but cool room, for say 6 years? (I have one, thus the question). Obviously, it has been exposed to oxygen, but that's about it. To be honest, I'd be surprised if I never bought a tyre from a dealer (as we do here, in the USA) that hasn't been hanging in a tyre rack for at least 3,4 or even 5 years... Just curious- any thoughts?  Hmmm....I just checked mine- it's a "Conti Tour" (front) for my GL1000, and it says "1904". Does that mean it was made in the 19th month of 2004 (that is to say July 2005; either sounds about right) or....do I have an "antique" that was actually manufactured in...um...1904?  Mine seems as soft and supple as the day I bought it, but...I DO say that, about ALL the girls!  Last edited on Sat May 22nd, 2010 04:07 am by Motorcycle Pete |
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| Posted: Sat May 22nd, 2010 09:50 am |
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7th Post |
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Lemen Leprechaun Rider
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There seems to be conflicting information regarding this tyre age thing. have a read here: Tyre Safety Info This is more related to car tyres but the same applies to motorcycles.
____________________ Liam ------------------------ Where you find quality, you will find a craftsman, not a quality-control expert. 2000 GL1500SE 1984 GL1200 Aspencade 1979 GS550E |
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| Posted: Mon May 24th, 2010 12:24 am |
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8th Post |
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derek hendry Bar Steward 
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looking at the original write up it will be week 19 2004 MCP thats a good bit of info there lemen
____________________ Derek and Maggie 2004 1800 in fridge White Rolls Canardly - Rolls down hill but can hardly get up em aka Fiat Ducato M/Home aka Tin Tent Honda Goldwing - Every corner an Adventure |
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| Posted: Mon May 24th, 2010 01:09 am |
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9th Post |
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Motorcycle Pete Colonial Rider
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Hi Derek- yes, my "month 19" of 04 was of course, "tongue in cheek"...I'm emulating you cheeky Brits, eh?  That makes perfect sense, of course, and I've no doubt that's right...purchased in late 2004 or early 2005. Have you discerned anything from the forgoing to suggest if, having been stored in the cool, dry, and dark, I should be concerned at all? Looks "fresh as a daisy" to me!
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| Posted: Mon May 24th, 2010 11:14 am |
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10th Post |
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derek hendry Bar Steward
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yes not sure on that one, what you could do is maybe contact the tyre maker and see what they say but i would probably think that they will err on the side of caution. maybe the tyres need a best used before date on instead. MCP you little kidder, haha
____________________ Derek and Maggie 2004 1800 in fridge White Rolls Canardly - Rolls down hill but can hardly get up em aka Fiat Ducato M/Home aka Tin Tent Honda Goldwing - Every corner an Adventure |
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| Posted: Mon May 24th, 2010 12:02 pm |
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11th Post |
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Silverfox Liason Officer
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derek hendry wrote:
Actually, he is quite a big kidder!!!!
____________________ Pete rblr.co.uk Why do today what you can put off 'til tomorrow, when you can be out riding!!! '06 GL1800 Comfort package model. '76 GL1000 Executive model. |
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| Posted: Mon May 24th, 2010 12:20 pm |
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12th Post |
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Lemen Leprechaun Rider
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Ok I give up, What's MCP?
____________________ Liam ------------------------ Where you find quality, you will find a craftsman, not a quality-control expert. 2000 GL1500SE 1984 GL1200 Aspencade 1979 GS550E |
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| Posted: Mon May 24th, 2010 12:22 pm |
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13th Post |
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Silverfox Liason Officer
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Shortened version of MotorCycle Pete's site name. For those of us that are "finger challenged" it just makes it easier to call him MCP. 
____________________ Pete rblr.co.uk Why do today what you can put off 'til tomorrow, when you can be out riding!!! '06 GL1800 Comfort package model. '76 GL1000 Executive model. |
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| Posted: Mon May 24th, 2010 12:24 pm |
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14th Post |
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Lemen Leprechaun Rider
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Duh! OK Lemen See
____________________ Liam ------------------------ Where you find quality, you will find a craftsman, not a quality-control expert. 2000 GL1500SE 1984 GL1200 Aspencade 1979 GS550E |
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| Posted: Mon May 24th, 2010 12:25 pm |
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15th Post |
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Silverfox Liason Officer
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I chose the site name of Silverfox, thinking that it was nice and short and simple, but noooooo, every bugger seems to just refer to me as Foxy, (well in public that is what they call me, I dread to think what they call me in private!!!  )
____________________ Pete rblr.co.uk Why do today what you can put off 'til tomorrow, when you can be out riding!!! '06 GL1800 Comfort package model. '76 GL1000 Executive model. |
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| Posted: Mon May 24th, 2010 12:28 pm |
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16th Post |
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Lemen Leprechaun Rider
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I was in Kilmore Quay in Wexford yesterday and I saw a Restaurant called SilverFox. I had no camera with me else I would have posted a Picture.
____________________ Liam ------------------------ Where you find quality, you will find a craftsman, not a quality-control expert. 2000 GL1500SE 1984 GL1200 Aspencade 1979 GS550E |
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| Posted: Mon May 24th, 2010 12:32 pm |
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17th Post |
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Silverfox Liason Officer
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Must be a popular name for restaurants in Ireland for some strange reason, we saw and photographed one by the same monicer in Killarney on the first European Meet & Greet.  Fame at last.
____________________ Pete rblr.co.uk Why do today what you can put off 'til tomorrow, when you can be out riding!!! '06 GL1800 Comfort package model. '76 GL1000 Executive model. |
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| Posted: Mon May 24th, 2010 12:52 pm |
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18th Post |
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Silverfox Liason Officer
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Coming back on track, I watched the video footage from your link Liam and was surprised to hear that the date code is in fact stamped on a tryre, beneath the rim level, this seems to be a bit of bad practice, since it doesn't allow the owner to keep a check on tryres fitted to a vehicle.
____________________ Pete rblr.co.uk Why do today what you can put off 'til tomorrow, when you can be out riding!!! '06 GL1800 Comfort package model. '76 GL1000 Executive model. |
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| Posted: Mon May 24th, 2010 12:56 pm |
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19th Post |
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Silverfox Liason Officer
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I just went to the garage and was able to see the date stamp on my son's bike rear tyre, that one appears to be perfectly visible above the rim line. The Wing is buried behind his bike and not so easily seen, but I will check them later.
____________________ Pete rblr.co.uk Why do today what you can put off 'til tomorrow, when you can be out riding!!! '06 GL1800 Comfort package model. '76 GL1000 Executive model. |
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| Posted: Mon May 24th, 2010 05:33 pm |
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20th Post |
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derek hendry Bar Steward
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but how long a life does a low mileage tyre have
____________________ Derek and Maggie 2004 1800 in fridge White Rolls Canardly - Rolls down hill but can hardly get up em aka Fiat Ducato M/Home aka Tin Tent Honda Goldwing - Every corner an Adventure |
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