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I assume you've got the staggered 19". They're 19x8.5 ET33 and 19x9 ET44.
This means that the 20x9 ET20 will stick out 19mm more, and that's quite a lot, and will stick out passed the fenders.
The rears 20x10 ET25 will stick out even more, 32mm. This will also stick out passed the fender.
The tires are also larger, since the profile are 40 and 35, should be 35 and 30 on staggered 20s for the F10.
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F10 520d M-Sport Alpine White | HRE P43SC 20x9+20x11 | Michelin PSS 255/35+295/30 | KW V3 Coilover | M5 Front Sway Bar + M550d Rear Sway Bar | 3DDesign Front Lip | BMW M Performance CF Spoiler | BMW M Performance Diffuser | BMW M Performance Black Grills | BMW M Performance Pedals | |