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Hi All - I just purchased a set of "new" tyres from a moto seller on ebay however when I got them they are stamped from 2016!! they are Metzler Roadtec 01.

What are you thoughts? they seem very old!
 

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tyres have a lifespan of 7 years after which they generally start breaking down, you certainly couldn't race on them but you could happily commute on them. This is what I was informed by The tyre suppliers when I worked in the industry 10 years ago (Michelin)
 

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Hi All - I just purchased a set of "new" tyres from a moto seller on ebay however when I got them they are stamped from 2016!! they are Metzler Roadtec 01.

What are you thoughts? they seem very old!
Depends how they've been stored,away from direct sunlight etc.
 

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I read a report not long ago on a test done with exactly the same tyres manufactured some years (5?) apart.
The fresh set were installed and the rider cut a number of laps timing each. Then the stale set were installed and the session repeated. The first couple of laps were discounted as the rider gained confidence. The result was exactly the same times.
As far as I can understand, and from my own experience, once the thin oxidised layer is worn off, there is no difference old or young. Removing that layer takes only a handful of corners.
I'd be happy to use a tyre manufactured 7 or more years ago.
All bets are off if the rubber has cracked.
 

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My girl had 2016 Diablo’s in 2017 and I de-glaze them several times a year on forays. At 10+ years though I’d seriously consider binning them though for rubber group type due to UV and ozone degradation, even given she is dark-garaged.
 

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A few years ago I bought a ‘new’ Michelin X-11 (radial trials tyre).
I did not even look at the date code, since I just assumed it was new. I was out riding (dirt of course) and got to a spot that takes a 90º turn and goes right up a quite steep hill, with tiny roots etc. It is pretty slick and tricky. But normally I had no issues riding up it- just controll throttle/clutch/traction.
Well, I couldn’t make it up. My buddies couldn’t make it up. Even at 1psi it wouldn’t work.
I couldn’t figure out what the issue was, then though of looking at date code. It was something like 10 years old. total junk now.

I took it off and put on a new tyre with recent date code- went up the next week and cruised right up. I think forgot about it and decided to try it on another bike. Same result.
Another time I was following a guy on a Montesa and he was having a lot of traction issues, I was having none. I asked about his pressure (3-4psi) then suggested he check date code. It was some 6 years old. He installed a new one and the next week he had no issues.
 

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A knobby has a vastly higher surface area than a road tyre, so when that surface oxidises/hardens, it can only be scrubbed off on the outside. The hardened surface of the walls remain harder and therefore stiffer. It's less compliant and won't grip as well.
A road tyre doesn't have that problem. It's tread shouldn't be moving.
 

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These are trials tyres, not knobbies. But of course not the same as street.
But after that experience. I suspect a street tyre would be no better.
 

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Yep he can risk his life on old tyres, I certainly wouldn't, having seen the INSIDE of the casing that let go at 7 years old it was cracked up like safety glass, that's where the seal is and everything that holds it together doesn't matter the brand I have seen this with Michelin AND Pirelli, you cant see the inside unless you dismount the tyre, - and if you dismount the tyre you may as well replace it with something much newer! - I used to work at a place called Cycletreads in NZ (And apart from the owner being a king sized A hole) I met and talked to several distributors and manufacturers reps for various brands tyres and (All) pretty much said You shouldn't race on them (And I have a feeling there is a regulation in NZ about racing on tyres and wearing helmets older than 2 years where you cant race) I don't see how the majority can be wrong on this and yes storage definitely comes into it, - but having seen the damage caused by a sudden delamination at speed (And the tyre looked mint, and actually was only 5 years old) I personally would go for safety regardless of cost, - but that is me. I was told when I asked why this happened and the manufacturers rep said that the steel used in the casing corrodes due to ALL rubber being hydroscopic to a degree (Where it absorbs water) and is helped on its way by temperature differentiations even though the air is trying to force it in the other direction (Cue 1PSI drop in tyre pressure per month) AND you can also say a lot of newer tyres have kevlar bands that are not steel, but I don't know which - do you? and I don't have x ray vision (Anyone have Superman as a personal friend?) Anyway I wish you all safe travels on your bikes and just use common sense regarding tyres.
 

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.. having seen the INSIDE of the casing that let go at 7 years old it was cracked up like safety glass,
Thanks Neil, that's definitely worth considering, especially if the tyre was stored in high humidity.
I've seen the corrosive effects on alloy wheels and engine casings of bikes that live on the coast. I'll now include steel belted tyres to that list.

However, it is easy enough to check for steel belts. Use a magnet.
Michelin Road 5 & Power RS are non-magnetic (so either kevlar or stainless steel & therefore less prone to corrosion),
but Metzler M9, Bridgestone BT016, Pirelli Superbike slick & Supercorsa are magnetic.

Also, if you mount your own tyres it's easy to check for internal damage. I do it without even thinking about it, but now I will pay even closer attention.
 

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Yep he can risk his life on old tyres, I certainly wouldn't, having seen the INSIDE of the casing that let go at 7 years old it was cracked up like safety glass, that's where the seal is and everything that holds it together doesn't matter the brand I have seen this with Michelin AND Pirelli, you cant see the inside unless you dismount the tyre, - and if you dismount the tyre you may as well replace it with something much newer! - I used to work at a place called Cycletreads in NZ (And apart from the owner being a king sized A hole) I met and talked to several distributors and manufacturers reps for various brands tyres and (All) pretty much said You shouldn't race on them (And I have a feeling there is a regulation in NZ about racing on tyres and wearing helmets older than 2 years where you cant race) I don't see how the majority can be wrong on this and yes storage definitely comes into it, - but having seen the damage caused by a sudden delamination at speed (And the tyre looked mint, and actually was only 5 years old) I personally would go for safety regardless of cost, - but that is me. I was told when I asked why this happened and the manufacturers rep said that the steel used in the casing corrodes due to ALL rubber being hydroscopic to a degree (Where it absorbs water) and is helped on its way by temperature differentiations even though the air is trying to force it in the other direction (Cue 1PSI drop in tyre pressure per month) AND you can also say a lot of newer tyres have kevlar bands that are not steel, but I don't know which - do you? and I don't have x ray vision (Anyone have Superman as a personal friend?) Anyway I wish you all safe travels on your bikes and just use common sense regarding tyres.
I am also a 62yo Timetriallist and have cycle-'raced' on tubs (tubulars) all my life. I mature them in a cool, dark place for a few years to toughen them up for road use as they can be fragile. This for both for butyl-tubed (Conti Podium and older-type Vittoria Chrono CS) and latex-tubed (Vittoria Open Corsa CX21). Punctures are very rare (I don't use a pre-sealant) and mostly I wear them out after a few seasons. I used to unpick and repair these 'sew-ups' when punctured but now just bin them as I CBA nowadays.
 

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Discussion Starter · #15 ·
Hi All - thanks for your feedback. I got a message from the supplier saying "the tires are kept in a temp controlled storage, with no outside light and only LED lighting - they have full confidence the age is not an issue"

The tires were also cheap for that reason ($449 delivered (front and back)) - If I were to upgrade to the latest model it is +250.
 
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