dating OLD tyres |
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Jerry atric
Senior Member Joined: 24 Nov 2014 Location: Wiltshire Status: Offline Points: 3367 |
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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.
I know we have some bright folk on here, I haven't got anywhere with Google Thanks. Chris |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Do Pirelli and Michelin have customer Services? They might help.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Dukedesmo
Senior Member Joined: 17 Apr 2015 Location: Leics Status: Offline Points: 856 |
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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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Le Mans 2
Ducati 916 Ducati M900 |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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It seems the four digit code started in 2000. Before that they used a 3 digit code.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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nab301
Senior Member Joined: 29 Oct 2017 Location: Dublin Ireland Status: Offline Points: 443 |
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As above I'm familiar only with 4 digit codes and apparently 3 digit codes are from pre 2000
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Nigel
Keep smiling , it makes people wonder what you've been up to! '19 CB125F, '18 DL250 SUZUKI V STROM,'99 Bmw R1100S, '03Bullet 65 500, '93 MZ301 Saxon fun (offroad) |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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yes 4 digits in a little ‘cartouche’, if none they’re scrap (too old)
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"Chicken nuggets don't dance on a Tuesday."
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Jerry atric
Senior Member Joined: 24 Nov 2014 Location: Wiltshire Status: Offline Points: 3367 |
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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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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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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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Brian.
Better 5 minutes late in this world than years early in the next. |
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Jerry atric
Senior Member Joined: 24 Nov 2014 Location: Wiltshire Status: Offline Points: 3367 |
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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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Wits
Admin Group Joined: 13 May 2014 Location: Shropshire UK Status: Offline Points: 627 |
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No thought about dating tyres...
Dated a few dragons in my time.....
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BMW 1200RTLC carbon BLack SOLD….
Breva 1100 2005 in Black SOLD..... St George's Telford Shropshire. |
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Android
Senior Member Joined: 14 May 2014 Location: Frogham, Hants Status: Offline Points: 433 |
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thought I had better check this thread out as perhaps I was not up to speed on the lingo.
oh how dissapointing |
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You can't buy happiness,
But can buy a bike and that's pretty close! Moto Guzzi 1200 Sport |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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I must admit that was my first reaction when I saw the title.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Jerry atric
Senior Member Joined: 24 Nov 2014 Location: Wiltshire Status: Offline Points: 3367 |
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Oh man! I've got a problem...it never occurred to me I need to get out more
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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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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Tony-C
Falcone Joined: 18 Aug 2017 Location: Lancashire Status: Offline Points: 67 |
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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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Tony
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