Just swapped out my 19" Sport wheels with their wide Diamaris' for a set of 17" OEM wheels with Vredestein Wintrac XL tyres. The UK is in the throes of one of the worstwinters in decades, so I reckoned the tyres would make a big difference on the snow and ice....the journey home tonight on the Vredesteins flt very solid, no sign of slipping on the snow / ice, and the ride quality was really good. I too will use the spare in the boot if needed as the rolling circumference is pretty well the same as the 17"s.