If you intend to actually use the car's rough riding capabilities, I wouldn't go bigger than 17". Any larger and the matching low profile tyres will not be contributing to smoothing out the bumps, the rims will be closer to damaging rocks and the ride will be harsher on all surfaces. Big wheels with low profile tyres are designed for smooth black top cruisers but your car has an off road capability which you would undermine by fitting an eye candy wheel/tyre combination. Personally I cannot see the point of having an XC70 with licorice strip tyres.
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey
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