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Old 22.10.2013, 10:19
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Winter tyres for BMW question

Hi all
That's the first time I'm going to get winter tyres for my car and I have some doubts. I have a bmw X1 which, if I'm not wrong, has the tyres pressure sensor. I decided to buy them on-line at reifendirekt.ch, which seems to have a good price. But they don't come with the tyres pressure sensor.

My question is, would that be a problem? I'm mean, I'm afraid to have beep or light blinking on my car panel the whole winter or is it possible to "tell" the car to ignore the fact I have no sensors?

Cheeers
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Old 22.10.2013, 11:05
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Re: Winter tyres for BMW question

I don't think the sensor is i the tyre my friend!
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Old 22.10.2013, 11:07
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Re: Winter tyres for BMW question

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I don't think the sensor is i the tyre my friend!
The wifi ones might be.
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Old 22.10.2013, 11:18
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Re: Winter tyres for BMW question

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The wifi ones might be.
Don't think so

I have no experience of this, but as far as I know it's all to do with the speed of the wheels, and it would be rediculous to put a sensor inside a tyre or the actual wheel itself.

So simply just replace the tyres or the whole wheel and then follow the instructions in the owners manual to reset the sensor. Job done.

I might be wrong but I'm probably right

Edit: http://en.wikipedia.org/wiki/Tire-pr...itoring_system
So seems I was half right or half wrong So it depends on the TPMS installed in your vehicle it might or might not have a component attached to the tyre somehow which should measure the pressure or the speeed of the wheel. If it's the former then you need to have it in the tyre if not then you don't have anything to worry about.

Speak to your BMW dealer.
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Old 22.10.2013, 11:23
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Re: Winter tyres for BMW question

Thanks for the posts. I'm not sure in my case how it works (specifically with my car) but you can have the sensor inside the tyre and have all information send by RF

http://blog.tirerack.com/blog/docs-a...essure-sensors
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Old 22.10.2013, 11:26
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Re: Winter tyres for BMW question

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Don't think so

I have no experience of this, but as far as I know it's all to do with the speed of the wheels, and it would be rediculous to put a sensor inside a tyre or the actual wheel itself.

So simply just replace the tyres or the whole wheel and then follow the instructions in the owners manual to reset the sensor. Job done.

I might be wrong but I'm probably right
Some have sensors inside the wheel but they are fitted to the rim and not the tyre so changing the tyres shouldn't make a difference.

You can reset the X1's monitor which you will need to do if you change the tyres:

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Old 22.10.2013, 11:26
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Re: Winter tyres for BMW question

The article seems to suggest that BMW and Audi use the indirect system so you have nothing to worry about.
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Old 22.10.2013, 11:32
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Re: Winter tyres for BMW question

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The article seems to suggest that BMW and Audi use the indirect system so you have nothing to worry about.
But you'd still need to reset the monitor after the change.
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Old 22.10.2013, 11:34
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Re: Winter tyres for BMW question

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Some have sensors inside the wheel but they are fitted to the rim and not the tyre so changing the tyres shouldn't make a difference.

You can reset the X1's monitor which you will need to do if you change the tyres:

Thanks, but in my case I'm buying the complete set (tyres and wheels), I guess it would be easier and cheaper to change.

Oh God, cars nowadays have more software than computers , I'm happy I'm a software developer

Last edited by aperez; 22.10.2013 at 11:36. Reason: add comment
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Old 22.10.2013, 11:38
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Re: Winter tyres for BMW question

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But you'd still need to reset the monitor after the change.
Ok, if it is just a case to reset it its fine. I just don't want to go mad driving with beep in my years for 5 months
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Old 22.10.2013, 11:40
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Re: Winter tyres for BMW question

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But you'd still need to reset the monitor after the change.
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So simply just replace the tyres or the whole wheel and then follow the instructions in the owners manual to reset the sensor. Job done.
Agreed
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Old 22.10.2013, 11:45
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Re: Winter tyres for BMW question

Ok, I think I'll be fine.
As soon as I change them I let you know how it went

Cheers guys
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Old 22.10.2013, 11:50
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Re: Winter tyres for BMW question

I have a BMW and know from expierence that you only have to reset the tyre pressure thingie if you had a flat tyre. Never reset it after I change the summer or winter ones, but it worked perfectly fine a couple of months ago when I indeed did have a flat tyre (big nail in it but hadn't notices as I have runflat tyres).
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Old 22.10.2013, 12:21
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Re: Winter tyres for BMW question

VW uses the ABS (Anti-lock brakes) to detect a difference in speed of wheels, as lower pressure in a tyre mean the diameter is less and it spins faster...
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Old 22.10.2013, 12:38
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Re: Winter tyres for BMW question

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VW uses the ABS (Anti-lock brakes) to detect a difference in speed of wheels, as lower pressure in a tyre mean the diameter is less and it spins faster...
Err, no, that's not how modern VWs monitor tyres. There is a sensor in each wheel's valve the sends a signal to the car. If the pressure changes by more than a preset threshold it triggers a warning. Same system on Audis.

How do I know this? Well, with one VW and one Audi, and four sets of wheels, one of which doesn't have the special valves, it's not difficult to spot. When I put the winter wheels on the VW (which I did last Sunday, as it happens) it gives a different message after about 15km of driving, to say that tyre monitoring was turned off. Switching the summer ones back prompt it to switch back on. There's also a facility to monitor "partly loaded' tyres, allowing a lower pressure to be used without triggering the alert.

Last edited by Ace1; 22.10.2013 at 13:10. Reason: clarity
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Old 22.10.2013, 13:17
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Re: Winter tyres for BMW question

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I have a BMW and know from expierence that you only have to reset the tyre pressure thingie if you had a flat tyre. Never reset it after I change the summer or winter ones, but it worked perfectly fine a couple of months ago when I indeed did have a flat tyre (big nail in it but hadn't notices as I have runflat tyres).
But do they detect for only a difference in tyre pressures between the four tyres, or the fact that although all four tyres may have the same pressure, that pressure may be incorrect?

The former would detect a flat, but would not detect the fact that all tyres that had been stored over summer had reduced inflation.
The latter scenario would probably require a reset.

So, in that case, better to re-inflate to the correct pressure and then reset the monitor.
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Old 22.10.2013, 13:31
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Re: Winter tyres for BMW question

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Err, no, that's not how modern VWs monitor tyres. There is a sensor in each wheel's valve the sends a signal to the car. If the pressure changes by more than a preset threshold it triggers a warning. Same system on Audis.

How do I know this? Well, with one VW and one Audi, and four sets of wheels, one of which doesn't have the special valves, it's not difficult to spot. When I put the winter wheels on the VW (which I did last Sunday, as it happens) it gives a different message after about 15km of driving, to say that tyre monitoring was turned off. Switching the summer ones back prompt it to switch back on. There's also a facility to monitor "partly loaded' tyres, allowing a lower pressure to be used without triggering the alert.
Don't know what year your VW/Audis are, but my 2009 Polo (current model) uses ABS. So the change from summer to winter, or the other way, is simply a matter of pressing the sensor reset button in the glove box.

It only give a warning and does not indicate which tyre or what pressure...
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Old 22.10.2013, 13:38
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Re: Winter tyres for BMW question

Use a TPG as a secondary confidence check.
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Old 22.10.2013, 13:43
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Re: Winter tyres for BMW question

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Don't know what year your VW/Audis are, but my 2009 Polo (current model) uses ABS.
2008 Passat R36 (top spec model) and 2010 Audi TT roadster. So maybe the smaller/cheaper models work as you suggest, although I wouldn't have thought it reliable, particularly if you have run-flat tyres where the different revolution speed wouldn't be significant enough to notice. Maybe you don't get run-flats on that type of car though.

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So the change from summer to winter, or the other way, is simply a matter of pressing the sensor reset button in the glove box.
Both of ours have a much more obvious button near the gearstick, and it can turn the monitoring on/off/partial_load as well as resetting after a deflated tyre is fixed.

As for the reset requirement with winter/summer ones, well, as I said, the VW's winter ones don't have the sensor, which is detected by the vehicle and switches off the monitoring automatically. And I'm pretty sure that the Audi doesn't need any reset either, provided that the pressures are similar in the winter and summer tyres, which they are. I haven't driven it since the weekend to be 100% sure of this though.
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It only give a warning and does not indicate which tyre or what pressure...
Well that's also the case with the sensor-driven systems - they work by being in rough proximity to the car over a period of time while driving (to avoid other cars' sensors confusing them) but there's nothing to say which signal is coming from which wheel.

A quick google shows that both methods are in use in some VW cars: http://www.volkswagen.co.uk/technolo...yres-indicator
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Old 22.10.2013, 21:08
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Re: Winter tyres for BMW question

All I know is that on our BMW it sensors the wheels have been changed every season regardless of how particular one is about them being the right pressure. It is the suspension system that detects the change and it it takes it a while. sometimes. So you just pull over, go the tyre calibration part on the idrive and drive off again and it is happy for another 6 months. presupposing you don't have a puncture in the meantime
We don't have run-flats so maybe there is another procedure with them - in any case RTFM and all will be revealed.

GT
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