Peter,
The below is an excellent review of recommendations round the world.
Six years, Five years and Six years. Although I would put less weight on
the Ford and Chrysler recommendations than the Tyre and Rubber Association
ones. This is not a 5year - 1day =good and 5yr +1day=bad situation, it
depends on the use, the storage, the conditions it has been kept in etc etc.
If you keep a tyre on a car 5 years (or so), inflated and don't rotate the
ground contact patch but otherwise keep it in ideal conditions it will
crease and get a flat spot. OK for display but bad for driving. Move the
tyre round fairly frequently it will be OK. Jack the car up on blocks it
will be OK
Five years is a good time to have an in depth check wether your tyre has
been used or not. Look for the little cracks and crazing on the sidewall
where it flexes under a static load, the little lines or cracks in the
grooves at the bottom of the tread. Wrinkles and splits where the side wall
meets the wheel rim, they are aging signs and it is time to get new.
Strong sunshire, exposure to arc welding flash, ozone gas, even some tyre
wall polishes and paints(!) all go towards aging rubber. However, it is not
a case of weld near a tyre and it will fail the next time you use it - the
sky isn't falling down! - but it will age it faster.
Guy R Day
---- Original Message -----
From: "Peter Shull" <pdx.pete@verizon.net>
Cc: "Spridgets List" <spridgets@autox.team.net>
Sent: Wednesday, September 03, 2008 6:13 AM
Subject: Re: [Spridgets] 155sr-13 tires
> Tire Rack tech article:
> http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=138
> Reviews the variables and cites variou recommendations:
> The British Rubber Manufacturers Association: "... unused tyres should not
> be put into service if they are over six years old and that all tyres
> should
> be replaced ten years from the date of their manufacture."
>
> The Japan Automobile Tire Manufacturers Association: "... vehicle tires
> promptly inspected after five years of use to determine if the tires can
> continue to be used ... all tires (including spare tires) that were made
> more than ten years ago be replaced with new tires."
>
> "... the U.S. divisions of DaimlerChrysler and Ford Motor Company joined
> their European colleagues in 2005 by recommending the tires installed as
> Original Equipment be replaced after six years of service."
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