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when to replace tyres

I've just bought a 2014 Sterling Moonstone. I've read the tyres should be changed at 5 years with a max of 7. One of my tyres is 2019 but it looks like new, so I'm guessing it has not been on long or done few miles. So do people apply the 7 year rule regardless?
 
There is no legal time limit for NON commercial trailer tyres,
I change mine at 7 year from fitment, I note it in my service schedule book.
I inspect them myself about every 3 months for damage , especially on the inboard sides.
Here is a link that is good information.
 
I used to change at five years from DoM, but my tyres were less than six months from DoM as I bought popular brands from mainstream suppliers. As others have said tyres are unlikely to wear out, and it’s the it’s the unseen deterioration you can’t see. But my last van tyres were at 60 psi so I erred on the side of caution. Specific trailer tyres like GT Radial Kargomax ST series or Kenda equivalent do have different construction to combat life on trailers compared to tyres used for cars or vans.
 
The sad thing is that tyres can be legally sold as 'new' up to 5 years after manufacture if they have been stored correctly. When I arrange to have new tyres fitted I always make a point of informing them that I will reject the tyres if they are over a year past manufacture, then check them when I get there.
 
The issue with tyres are 1. the lack of mileage leads people into a sense of false security and as the requirement for regular inspection (MOT) is not applicable to caravans, degradation to the tyres may go unnoticed until they fail catastrophically . 2. if they do fail , you may not be aware of it as soon as you would if a car tyre blew and the rim will most certainly be damaged by running on our our lovely roads. 3 the damage a failed tyre carcass causes to the caravan is far larger than on a car due the materials used in construction ( wheel spats disintegrate, wheel box shattered and caravan frame, wall and lower trim piece all damaged )and repairs ain't cheap.Compare this with the cost of two new tyres every five/seven years to me its a no brainer, which reminds me, I need to take off my wheels and get the tyres replaced.
 
On the annual service this year an indentation was noticed in the inner wall of one tyre, enough for it to need replacing. I did both as I got a reasonable deal for two.
 
I'd really like to know where the rationale for the guideline of 5 to 7 years comes from and how long ago it was established. Tyre composition has changed over the years due to amongst other things environmental issues - which usually result in things not lasting as long as they used to.

I can remember the days when I could get over 50k miles on my tyres but these days its more like 30K.

For what its worth, and something I've stated before, my daughters caravan was over 17 years old and still running on the original tyres. The body work died before the tyres. She lives in NZ where they get a lot more sun than we do.
 
I'd really like to know where the rationale for the guideline of 5 to 7 years comes from and how long ago it was established.

I don’t know how it was established either, but it does tie in with a German regulation that tyres must not be older than 6 years if one wants to make use of a concession to tow at 100km/h instead of the regular 80km/h limit that applies to trailers in general. It is one of the items that are checked during the regular roadworthiness inspection. However, I also have a small flatbed trailer for local work and that still has its original tyres although it’s 18 years old. Nobody has ever questioned that when it’s submitted for test.
 

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