Runflat warning

[Sheilz]

Had to get new tyres fitted today. Mechanic/fitter was quite alarmed that there were no sensors on the tyre valves which made me wonder, should there be? where the hell have they gone? and if not, how the hell does the system work?
Late afternoon went over a pothole and a couple of miles later the runflatwarning came on. This has happened a lot lately. I always check my tyres when this happens just in case and invariably get different readings. Today I just reset the darned light having just done a few miles on new tyres etc, etc. Is this worth a visit to JC?

[Sweeney]

Its a rotation based sensor than a pressue sensor. It monitors the rolling radius or whatever of each wheel and if ones punctured or loses pressure it picks it up... Mine worked fine as soon as a screw popped out my tyre it bonged and lit up straight away well in advance of losing most of my control

[Burple]

Calm yourself.. take a deep breath

The runflat system works in a different way..something to do with differences in height from the ground.. or something.. can't remember exactly off hand, but nowt to be alarmed about. sure somebody else will be along soon to confirm



[edit]: Er, yer.. wot he says ^

[duncan]

Remember, however, if all the tyres deflate at a similar rate, then the rotational speed will be similar of all the tyres, and not be detected by the RFD.

[john]

Judging by what you told me today about the tyre fitter Im surprised he has even heard of run-flats or even sensors

[bigcoyote]

Hey all,

The runflat / air press. warning uses the ABS / Traction Control sensors ( I think )
It monitors the rotation of the wheels and if one is turning faster than the rest ( smaller tire diameter = low air press. ) then the light turns on.
Mine normally does not go off untill there is at least a 10psi drop in the tire.

There are no sensors in or on the wheels / tires that I know of.

That being said - was the tire shop still lit by oil lanterns or did they upgrade to electric lights yet

[Neil and Lorna]

Sheilz

I hope it wasn't the same tyre fitters that did your tyre before Oxford in April.


Neil.

[X30YES]

"That being said - was the tire shop still lit by oil lanterns or did they upgrade to electric lights yet".

Sheilz ....seems all the high mileage you do is starting to tell you something me thinks

[AndyP & Lenore]

quote:Originally posted by duncan

Remember, however, if all the tyres deflate at a similar rate, then the rotational speed will be similar of all the tyres, and not be detected by the RFD.

So if the cops try to stop you with a Stinger, you won't even know you've been stung.

A.

[duncan]

The flashing blue lights are normally a give away in that case!