E91 320D - What tyres sizes are spec?

[Fastchas]

Bought a 320D ES last year and regret it. Sold my 118d M Sport and it was 100% a better drive.
Anyway, I need to change the tyres. When I go online and enter my reg. number the sizes offered are always 225's, regardless of the website. The car is currently on 205/55/16 RFT's.
Are they the correct size?
Also, would you recommend ditching the RFT's for normal boots?

[jackh707]

Drivers door, there is a metal plate stating all the sizes and optional sizes along with pressures.

Have a look there.

[Locknut]

Your post suggests that the original size might have been 225/50/16, which would give almost the same rolling radius as 205/55/16.

The 205/55/16 seem to have a bigger selection of patterns at a better price which may be the reason the size was changed (if it was changed). I would be happy enough to stay on the 205s if it were my car.

Getting rid of runflats will improve your car, but there is the question of how you cope with a puncture. I suppose it all depends on the driving you do and where you do it, in other words can you call on a repair service or do you do critical journeys such as an early morning run to the airport.