I use 17s on my 240 in the winter. WolfGTI is right. It's all about tire temps. I'm running 225/45-17 tire in 17x7.5 inch wheels. When the weather is in the 50s I notice a decrease in traction with the winters. However, anything below that it makes a huge difference. Bare in mind I run pilot super sports in the summer and those become useless below 50 degrees.
In my 328 I ran all seasons year round. I can tell you my 240 with winters in 2wd has way more control in the winter then the 328 xdrive with AS.
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