That's one type, a battery, sensor and transmitter in a lump inside the
The other type have no actual pressure sensor at all, but monitor the
relative speeds of the wheels from the ABS sensors, and spot slow (or
rapid) deflation based on that.
I agree although I think the original alloy wheels 50-60 years ago on
rally cars were to reduce the unsprung weight. Also it does appear that
reducing the unsprung mass does increase cabin noise and vibration which
is not what you want on a normal road car.
I agree - alloys are a pointless gimmick. Nickable so need locking nuts,
easily damaged by kerb grinding, expensive.
Why they couldn't just get the "look" by careful design of a full sized
"hub cap" beats me.
On Sunday, June 24, 2018 at 5:02:56 PM UTC+1, Tim Watts wrote:
I used to have a Rover 416 which had alloy-look wheel trims. One went missi
ng and I went to the dealer's for a replacement. "What type is it?" asked t
he chap behind the spares counter. "One like those", I said, pointing out t
he door to my car, which was parked so that the two fully-shod wheels were
visible. "But those are alloys" he insisted, and wouldn't change his opinio
n until he'd gone outside to see the bare steel wheel.
The unsprung mass of a fat tyre is only the mass of the bit of tyre on
the road - at least for small bumps. Modern skinny tyres have almost no
give, so the suspension has to do all the work. And the result is a
harsher ride, poorer handling, and vulnerability to potholes.
Some think they look better. Which overrides the other three.
Doesn’t need to be flat, just under inflated. I've had lots of
those where when checking the tyre pressure at the service
station does see some more air needed in a particular tyre.
And my Getz is a real bugger with a true flat tyre, very hard
to even notice its gone flat and that means most of the flats
result in a buggered tyre since you drive on it flat long
enough to fuck the tyre so that fixing the leak wont work.
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.
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.
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