DOT stamp shows age of tires, I did not know my tires were 13 years old |
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DOT stamp shows age of tires, I did not know my tires were 13 years old |
Michael N |
Sep 4 2006, 11:41 AM
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#1
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Certifiable Group: Members Posts: 1,426 Joined: 6-June 04 From: San Jose, Ca Member No.: 2,164 Region Association: Northern California |
So I am watching Motorweek on the Speed Channel and during the Goss' Garage section they are talking tires. They covered the when to change old tires etc.....
I did not know you could tell the week and year a tire was produced by looking at the dot stamp on the sidewall of the tire. So I go and check my tires and find they are 13 years old (second week of 1993). I think it might be time to change them for safety reasons. I don't want to be going 100MPH and have one blow out due to the age, although the tires have alot of tread left and don't seem to be cracking. Are they just helping to sell more tires or would you change? A typical Pre -1999 DOT number GJHV234319 GJ= Manufacturing plant code HV234= other production information 319= date code 31st week of 1999 (9=1999) A typical 2000 up DOT number BTFR872001 BT= Manufacturing plant code FR87 other production information 2001 = 20th week of 2001 (01= 2001) Attached image(s) |
SirAndy |
Sep 4 2006, 11:56 AM
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#2
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Resident German Group: Admin Posts: 41,688 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
A typical Pre -1999 DOT number GJHV234319 A typical 2000 up DOT number BTFR872001 interesting ... gotta go and check mine ... (IMG:style_emoticons/default/idea.gif) Andy |
Joe Bob |
Sep 4 2006, 12:09 PM
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#3
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
Yup.....the old pharts on the 356 list were discussing the same thing. Some of those guys are driving on tires from the 80s.....I bet rocks have better grip....
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richardL |
Sep 4 2006, 12:14 PM
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#4
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Senior Member Group: Members Posts: 713 Joined: 27-January 03 From: San Diego, CA Member No.: 201 Region Association: None |
I just checked mine, various sets:
Yokohama = 115 = 11th week of '95 Kumho V700s = 1700 = 17th week 2000 other Kumho V700s = 259. midway through 1999 Makes a lot of sense. Thanks for the info R |
JPB |
Sep 4 2006, 04:18 PM
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#5
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The Crimson Rocket smiles in your general direction. Group: Members Posts: 2,927 Joined: 12-November 05 From: Tapmahamock, Va. Member No.: 5,107 |
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kenschipper |
Sep 4 2006, 06:09 PM
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#6
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Member Group: Members Posts: 186 Joined: 5-May 04 From: San Juan Bautista, CA Member No.: 2,025 Region Association: Northern California |
So I am watching Motorweek on the Speed Channel and during the Goss' Garage section they are talking tires. They covered the when to change old tires etc..... I did not know you could tell the week and year a tire was produced by looking at the dot stamp on the sidewall of the tire. So I go and check my tires and find they are 13 years old (second week of 1993). I think it might be time to change them for safety reasons. I don't want to be going 100MPH and have one blow out due to the age, although the tires have alot of tread left and don't seem to be cracking. Are they just helping to sell more tires or would you change? A typical Pre -1999 DOT number GJHV234319 GJ= Manufacturing plant code HV234= other production information 319= date code 31st week of 1999 (9=1999) A typical 2000 up DOT number BTFR872001 BT= Manufacturing plant code FR87 other production information 2001 = 20th week of 2001 (01= 2001) OK, what does it mean if there is no DOT stamp. My 185/70 15 on 914/6 are Uniroyal Steel max and do not have a dot sticker. Tred look like it came off a rally car. When I autocrossed it for the first time last month it really slid all over the place. Fun and controlable but not real fast. About 4 seconds slower then my 4 on more modern rubber, and on a fast course really designed for 911's. |
SirAndy |
Sep 4 2006, 06:31 PM
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#7
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Resident German Group: Admin Posts: 41,688 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
what does it mean it means your tires are from the '70s, probably as old as the car and should not be used for anything other than to roll it around the driveway ... (IMG:style_emoticons/default/blink.gif) Andy |
maf914 |
Sep 5 2006, 09:01 AM
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#8
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None |
The son of a good friend of mine is a tire developement engineer for Goodyear in Akron. He told us some time ago that the rubber in tires typically loses a large percentage of their performance capacity within five years. They are best when new and go downhill from there.
I read this same thing in a Road & Track article this past year. Various manufacturer's tire engineers indicated that five years is considered old for a tire. I currently have an old set of Yoko Intermediates on my car and the rubber feels hard as a brick. I know it's time for replacement, not from lack of tread, but from old age. |
Boojum |
Sep 5 2006, 02:20 PM
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#9
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Member Group: Members Posts: 95 Joined: 31-July 06 From: Denver, CO Member No.: 6,550 |
what does it mean it means your tires are from the '70s, probably as old as the car and should not be used for anything other than to roll it around the driveway ... (IMG:style_emoticons/default/blink.gif) Andy After a pretty good accident involving some stupidity on my part, I don't even consider old tires useful for filling with air. Nowadays, I always use a positive-locking air chuck hooked up to one of those tire gauge/valve combo dealies, with a 10-foot hose and a really good 0-100 PSI dial gauge just to be absolutely positive about the pressure that it the tire. Old tires are like hand grenades only less predictable, as far as I'm concerned. |
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