Terve Ari, at least on my E87 1-series TPM is done by using ABS (or traction control) sensors. So you can use aftermarket wheels and with my experience in Finland, get rid of runflats and take good regular winter tyres. I'm using 17" Continental ContiVikingContact 5's and the only problems is that the DTC has tendency to cut the torque since these winter tyres in scandinavia are softer than the tyres in e.g. Germany.
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