New 'old' tyres - thoughts?

rabbitstew · 2 Oct 2018

A couple of years back I fitted some new tyres on my R1, and when I got the old ones off, I discovered they were dated 2004. I had happily been wringing its neck without any grip issues at all, but it did make me think!

Alex · 2 Oct 2018

Have a read of this, it may help you decide:

http://www.warco.com/articles/shelf-life-vs-service-life-in-rubber-products/

I do work for a few firms who specialise in rubber. I was discussing the life of some serviceable munitions parts (that were only now getting replaced due to a previous Goverment's decision not to - not ours thankfully). He was saying 7 years as after that period both the strength properties and ability to seal would be compromised.

911UK · 2 Oct 2018

the biggest difference that Simon W has is that the tyres have never been used, never been through a heat cycle through cold or rain.

From my Tyre source.

When correctly stored in a climate controlled warehouse, tyres have an almost unlimited shelf life, and once they're on the road, proper care can add many years to a tyre's life.

"In general, we see six years of service with no more than 10 years of total life since manufacture."

If stored in variable warehouse conditions then assume no more than a 6 year operating life.

NLW73 · 2 Oct 2018

Does not matter. Rubber will go brittle after time due to the chemical compounds used in there to give it its flexibility

Exposing to sun and rain and cold just speeds up the cycle

Running anything past 8 years is just asking for trouble whether it's anoluty to seal on a rim or worse still blow out at higher speeds

NLW73 · 2 Oct 2018

Simon what is the actual age of the tyres? They may have been stor s for 8 years but could have been 3 years old when put on the rim

There will be a small box on the side wall with numbers in there. 3910 would mean made 39th week of 2010 so 8years old. 3908 would mean 10 years old of course

Looks like Conti sports 2 which is an old tyre design and tech now

Alex · 2 Oct 2018

My mountain bike I bought when I got banned in '96 have the same tyres on and have never let me down :grin:

wasz · 2 Oct 2018

But are they going to be better than a set of Wanli's cheapest?

I would run them on a golf used for normal activities. I would expect them to not last long on trackdays.

I would bin at 10 years.

911UK · 2 Oct 2018

NLW73 said:
Does not matter. Rubber will go brittle after time due to the chemical compounds used in there to give it its flexibility

Exposing to sun and rain and cold just speeds up the cycle

Running anything past 8 years is just asking for trouble whether it's anoluty to seal on a rim or worse still blow out at higher speeds

what you've said is factual but the cycle you refer to is that 6 to 10 year life based on usage and not storage

of course it's always better to fit fresh rubber, but the tyres are in effect as new and as long as they are re-balanced and fitted correctly, no reason why they wont be effective

ref what I said earlier, which is from a tyre technical specialist who works for company who makes Porsche N rated tyres.

From my Tyre source.

When correctly stored in a climate controlled warehouse, tyres have an almost unlimited shelf life, and once they're on the road, proper care can add many years to a tyre's life.

"In general, we see six years of service with no more than 10 years of total life since manufacture."

If stored in variable warehouse conditions then assume no more than a 6 year operating life.

NXI20 · 2 Oct 2018

I've just come back from 2 days at the 'ring (600Km on track) and a couple of runs up to 285KPH on the A1 in Germany. My front tyres are '08 & the rears are '12. They are NOS fitted last year and have worn & gripped exactly as expected. I did 5 laps in the wet with no problems either. These are Michelin Cups FWIW.

Correctly stored, tyres will last a very long time, certainly more than 6 years.

New 'old' tyres - thoughts?

rabbitstew

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