Winter wheels and tyres being offered to me

[Pinewood]

My current 19" staggered wheels have TPMS, and a set of winter 17" wheels that I am being offered may or may not have the sensors? ( will ring the guy tomorrow to get more information)
Those of you that run a winter set, is this a big deal?
Should I buy the sensors and fit them to the winter wheels?
If they are genuine winter wheels, will they have them anyway?
Can I just keep a regular check over the winter months myself as they come with winter runflat tyres?
Sorry for the newbie question regarding a winter setup, but until I quiz the guy selling them, I have no further information

[Pinewood]

Does the pre Lci F25 (2010-06/2014) use the old TMPS system of measuring the rotational diameter of the tyre, or like mine (Lci), use sensors in the wheels to give pressure readings?

[Pinewood]

So the wheels are spoken for, just need to go pick them up. Then i will need to buy the oem sensors and have them coded OR buy the BMW ones which won't need coding (obv).
Either way the tyres will have to come off so they can be fitted before winter

[Pinewood]

Picked 4 of these up with 6mm tread Sotto zeros for the princely sum of £300. The alloys are in fantastic condition.  All i need to do before October is buy 4 TPM sensors and have them mounted so the car doesn't give errors once fitted.
Does anyone know where i can source them,  or will it be a trip to the $tealership?

[Pinewood]

I have researched this topic at some length and sought advice on another forum.  For the benefit of others this is what i have learned....
1. TPMS use sensors that sit inside the tyre and are attached to the valve. It's one unit.
2. If you buy 2nd hand wheels (older) or new, factor in the cost of buying 4 sensors which retail at £40 each approx.
3. If you buy universal sensors, they will need to be coded (frequency etc).
4. BMW specific ones don't need coding.
5. They have a battery which requires replacing every 5 to 7 years.
6.running a car without the sensors, will give you puncture warnings every time.
7. Check if your car has the old system (which measures the overall diameter of the tyre), or the TPMS (gives actual pressure readings)

[sharpharp]

Pinewood,

Might pick your brains on this, I have a set of Winters which I haven't used yet.
I'm not sure if they come with the TPMS sensor, how do I check without having to swap the tyres over to see?

[Pinewood]

Look at the valves. If they are the same length/shape/silver like the ones on our 19' wheels,  then most likely TMPS. If they are the usual black and shorter then they don't have tmps sensors

I would be very surprised if they have TMPS sensors fitted because they are so new. Remember this system was introduced on the X3 lci models.
Edit: look at the pictures above of my 17" tyres

[kengxx]

Yes the TPS valves held on by nuts,on the std ones they are not there.