I have just had 2 Cross Climates to replace the OE Pirellis.I moved the existing rears to the front and fitted the Cross Climates on the rear.
Volvo recommend fitting new tyres on the rear if only fitting 2 tyres presumably to give more grip to avoid excessive oversteer.
I have not seen anywhere any indication that summer tyres on the front and ALL WEATHER TYRES, as opposed to WINTER TYRES, on the rear is dangerous or illegal.
I would not mix summer and winter tyres but have no problem with my setup.
The lack of steering feel of the XC60 is a bigger problem..........All IMO of course.
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