On 23/06/2018 06:38, Andy Burns wrote:
Michael Chare wrote:

Andy Burns wrote:

I've had about a dozen warnings from TMPS (the ABS type) over the
last 7+ years, not one of them false.

How flat were the tyres? How much pressure had they lost?

Varied ...

Several (yellow warning) times when tyres had just gradually lost
pressure without a puncture, maybe 43 down to 38psi, which would be
detected at about the same level as when I started to notice going over
speed humps was a bit softer than usual.

Several normal slow punctures from nails/screws (also yellow warning)

Once (red warning) where it picked up a fast puncture on the motorway
before I had noticed it, and by the time I had come to rest on the hard
shoulder the tyre was completely flat.

12 flat tyres in 7+ years is much more than I would expect.

Overall I think 5 were punctures (all except one were repairable) two
were from kerbs, the rest were just reminders to top-up pressures.

Several of the punctures occurred in the first year of buying the car, I
was half convinced there were nail-magnets fitted.

I thought I was prone to getting punctures but not as bad as that. I had
one wheel which vibrated a bit so I fitted it to the rear. Even then I
noticed a vibration at about 75mph. Eventually I had to stop for a flat
tyre and found that the tyre had developed a bulge say a couple of
inches in diameter which had then worn completely through. I wonder if
the pressure sensors in the tyres of my new car would have noticed that
before the tyre became completely flat.

--
Michael Chare