Same 5x112 PCD and same 66.6 mm centre bore: wheels from Mercedes A-Classe W177 bolt on and centre on BMW 3 Serie G20-G21 without rings. You still need to check the offset and tyres, detailed below.
| Mercedes A-Classe W177from 2018 | BMW 3 Serie G20-G21from 2019 | |
|---|---|---|
| PCD | 5x112 | 5x112 |
| Centre bore | 66.6 mm | 66.6 mm |
| Thread | M14x1.50 | M14x1.25 |
| Original wheels | 6.5Jx16 ET44 | 6.5Jx16 ET22 |
≈: width estimated from the original tyre size.
Each original wheel from Mercedes A-Classe W177 is compared with the one from BMW 3 Serie G20-G21 of the same diameter: how much closer the wheel gets to the shock absorber or how far it sticks out of the wheel arch, and whether the tyre keeps the same overall diameter.
Compared with the original 6.5Jx16 ET22 on BMW 3 Serie G20-G21: shock absorber side +22 mm, wheel arch side −22 mm, tyre diameter +0 %. Check in detail
An identical hub is not enough: offset, width and diameter change the position of the wheel, and larger calipers can touch a smaller wheel. Original wheels often use bolts or nuts with a specific seat: keep the fixings intended for the wheel, with the thread of BMW 3 Serie G20-G21 (M14x1.25), tightened to the torque shown on its vehicle page. Finally, check that the size is among the approved fitments for your vehicle. This comparison is for guidance only: have the fitting approved by a professional.
And the other way round: wheels from BMW 3 Serie G20-G21 on Mercedes A-Classe W177?