Ask Volvo Customer Services for a copy of the EU Certificate of Conformity for that car (unless you already have one). That (Item 35 and maybe some additional alternatives in Item 52) should list every wheel and tyre combination that has been type approved for that actual car. (The certificate will have your car's unique 17 character VIN on it). That's the definitive legal document. Next best place (as already mentioned) is the handbook, but that can be tricky, as many handbooks cover multiple variants and versions of the car, so you need to be careful to ensure that what's listed, actually relates to your specific car.