£170 is crazy, but again that sums up a lot of insurance companies. Luckily the company I use are OK with winter wheel use as long as they're OEM wheels that are fitted to some models of the same car, i.e. if 17" are fitted to other models (SE) then they're fine with me fitting them to my 330i M Sport. They're also OK with non-RFTs as long as they're UK legal and the correct load/weight rating.
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