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Taking a look at Real OEM, the 17" wheel for the F55/56 is 17x7" ET54
with a 205/45R17 tire. F54 Clubman 17" wheel is 17x7.5" ET54 with a 225/45R17 tire. Overall diameter is a bit larger (~3%) and wider (~10%).
If anyone is interested in picking up a cheap set of Clubman wheels and wants to better fill out their F55/56 wheel wells... I happen to be selling my flawless 'take-off' OEM 17" Net Spoke Black Wheels (replaced this weekend with 18"). Mileage limited to the delivery trip from the dealer. Includes the original Pirelli P7 Cintaro RFTs, OEM TPMS/RDCi and OEM Center Caps. The tires alone are worth close to $1,000 delivered and installed. I am willing to let the entire set go for $1250, picked up in southern Rhode Island.
Great for anyone leasing (who will need new tires eventually) or for anyone looking to build their own winter set... just add tires!