Tyre Pressure Monitor

**ace** · 22nd July 2007, 18:32

Can anyone please tell me if my Vectra 2.2 SRi (2006) has this feature.

I can't see 'Tyres' display on the trip computer below BC1/2 and Timer.

Thankyou

**Duncan** · 22nd July 2007, 18:40

Not as standard - only if it was specced as an optional extra.

**willc01** · 22nd July 2007, 19:03

Wasn't this dropped on the change to the facelift

**rushy** · 22nd July 2007, 19:27

Am I right in saying that they don't actually sense the pressure but the rolling radius of the wheel? As the tyre deflates the radius gets smaller.

**Duncan** · 22nd July 2007, 20:10

Originally Posted by willc01

Wasn't this dropped on the change to the facelift

You're right - looks like it was. No longer listed as an option in the facelift brochure.

Originally Posted by rushy

Am I right in saying that they don't actually sense the pressure but the rolling radius of the wheel? As the tyre deflates the radius gets smaller.

Not sure! I thought they would have been pressure sensors? To measure the differences in rolling radius on a rotating tyre the sensors would have to be very sensitive microwave sensors? Don't know - be interested to see what type of sensors they actually are.

**david.aka.judas** · 22nd July 2007, 20:33

apparently a little chinese guy gets out of the boot and has a look everytime you stop. If they are flat - he tells you.

**Duncan** · 22nd July 2007, 20:39

**BigMan** · 22nd July 2007, 20:42

It cant work on rolling radius can it, what happens when the tyre starts to wear???

**Duncan** · 22nd July 2007, 20:52

Yeah, but the internal rolling radius won't change with wear, just the external

**david.aka.judas** · 22nd July 2007, 21:00

its a chinese guy - I've told you

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