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Flat tyre indicator - useless?


burble
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On the way home from work this evening I went around a blind corner to find some **** in the middle of the road so I had to swerve to avoid him. Upshot is that the nearside rear tyre (and I think the rim) need to be replaced.

I knew instantly that the tyre had gone because the back end of the car was as loose as hell yet the flat tyre indicator didn't light up.

Luckily there was a side road that I could turn into about 100m up the road so I went in there and put the spare on and carried on home.

Is that normal? Are the flat tyre indicators really that useless that they don't tell you when the tyre is all but completely flat?

To complicate things further I'm off to Paris in the morning so am going to have to drive over to my parents tonight, get a lift to BHX with my Dad in the morning (got to be there for 5am - he'll love that!) and then he'll see if he can get the wheel sorted for me.

Bugger.

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Having had a look in decent light the alloy doesn't need to be replaced but I will have it refurbished as there is some damage. That can wait until I go to South Africa in a couple of months.

The tyre is definately dead, there is a cut in the sidewall. My Dad is going to get a new tyre fitted while I am in Paris.

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To answer the original question, the flat tyre indicator works by looking at the rotation speed of the wheels - tyre going down, smaller rolling radius. To work this out it needs the car to run a mile or so and it can detect about 3lb difference. If you get a complete blowout, it won't react immediately.

I've had two slow punctures and it caught them before the tyre was really low, which probably saved the tyres. One had lost a few pounds overnight and the warning light came on after driving about a mile.

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It strikes me as strange that it doesn't detect a total deflation quickly though - there will be a drastic change in rotation radius in a very short space of time. Admittedly you'd be hard pressed not to notice a total deflation but I don't think that's the point.

Plus, TheEdge said that one of his tyres was at 20psi and the indicator didn't do anything.

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[ QUOTE ]

I know, Sidicks - I was shocked to even read that someone could say anything could fall of a Porka. As if anything like that could ever happen ROLLEY~14.GIF

Bloody Golf drivers... tongue.gif

[/ QUOTE ]

Probably cost him an arm and a leg to fix his 996! Cost me £180 for a new tyre - and he didn't even pay for it! sportifs2.gif

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