OEM size diameter is 24.1", 205/55-16 is 24.9" about 3.4% larger than OEM.
Is it okay with your car, hard to tell.
I tried 245/45-17 instead of OEM 235/45-17 on my E430 10-11 years ago, the ABS malfunction within 100 miles such that I had to go back to OEM size, and the ABS malfunction light went off within a mile of driving.