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dating OLD tyres

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Jerry atric View Drop Down
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    Posted: 08 May 2018 at 19:57
Not sure if this in the right place, but here's my question. Can anyone work out these tyre codes please? On a Pirelli: 66 (big space) 20089.04 ; on an Italian made Michelin: ZDV17158. They are off my 1956 Super Alce which seems to have been off the road since at least 1985. I'm trying to build up a historical picture for my own interest.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 20:48
Do Pirelli and Michelin have customer Services? They might help.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 20:58
Don't know when they started putting dates on (if they're not on then they're very old) but the date is a 4 digit no. usually in a 'frame'. The format being: the first 2 digits are the week and the last 2 the year of production, e.g. '2712' would be week 27 of 2012.
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 21:27
It seems the four digit code started in 2000. Before that they used a 3 digit code.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nab301 Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 21:39
As above  I'm familiar only with  4 digit codes and  apparently 3 digit codes are from pre 2000
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 02:57
yes 4 digits in a little ‘cartouche’, if none they’re scrap (too old)


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 07:38
Yes they are definitely too old even though they have virtually no wear. I would just like to know how old as it may give a clue as to when the bike was last used. I think its been off the road since at least 1985 but if I could date a tyre to, say 1960 something then its a fair bet its been sat in storage much longer. I know from experience that it can take years for military equipment to get sold once it is obsolete. As this is a very late Super Alce, I have a theory it may have been issued and become obsolete almost immediately.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 07:38
This was not about whether the tyres were too old to use, just about whether, out of interest, the original date of manufacture could be found.
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Jerry atric View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 07:59
Yes, I wouldn't dream of using them. I'm probably a bit OTT. with tyres. I don't do enough miles on my small collection of old bikes to ever wear them out sadly so regularly scrap seemingly perfect tyres.

The old Pirelli I asked about is rock hard but the Michelin on the back is as flexible as the new replacements (Its getting Mitas)
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Wits Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 09:36
No thought about dating tyres...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Android Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 13:02
thought I had better check this thread out as perhaps I was not up to speed on the lingo.
 
oh how dissapointingCry
 
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 16:57
I must admit that was my first reaction when I saw the title.
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Jerry atric View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 20:12
Oh man! I've got a problem...it never occurred to me I need to get out more
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jefrs Quote  Post ReplyReply Direct Link To This Post Posted: 14 Aug 2018 at 12:24
At one time I was in charge of a hangar full of vehicle tyres. You will find on the web that new tyres have a shelf life of 6 years. If they're over 7 years, they're toast. Bad enough on a lorry, on a motorbike, eek! The rubber deteriorates, it perishes.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony-C Quote  Post ReplyReply Direct Link To This Post Posted: 14 Aug 2018 at 17:03
About seven years ago, I took both wheels off a little Honda I owned, ( CL400), for a pair of Bridgestone "Trailwings" to be fitted … This was at a well respected, and highly regarded, bike specialising firm, up here in the north west … Having had sterling service from them previously, I had absolutely no thought of going anywhere else … Earlier on this year, I called in to see my friendly MOT man... I was a little concerned with a number of small cracks in the sidewall of the front … They were akin to varicose veins … but no cords were visible at all … So, not an MOT failure … A "nagging doubt" wouldn't leave me … So I checked the date code ..... They were FIVE YEARS OLD at the time of fitting .... Moral = Take nothing for granted, learn the where the code is, and look EVERY time ... And, No, I have never been back ... Regards, Tony
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