Space saver tyres

[rondeo]

Full size LX steel wheels rim size is 6.5Jx16 ET50, which is stamped on steel rims near the valve.
They were also standard on some Foci. PCD is 5x108.

Alloys on the Zetec are pretty unambiguous, Mondeo only.

If the wheels are from a wreck, check for damage to the rims, I went back twice (third time lucky).

The difference in weight is up to 10 kg or two bags of spuds.
The floor on my wagon doesn't fit and is up to 50 mm higher with a full size tyre.
I'd take it somehow restrained on a long trip or
otherwise maybebe some meters under, mentally, doing 80 km/h.

What surprised me was the alloys were heavier than the steel wheels:

Alloys with near new tyre: 21kg

Space saver: 13kg

Steel with nearly worn out tyre: 17kg

According to the bathroom scales.

I don't think it's worth having a space saver on long trips.
I Google it's 5 flats per lifetime.
Two more for me?