Pressure with alternate tire sizes

[iXguy]

My 128i Msport comes with 215/40R18 and 245/35R18 front and rear and calls for 35 and 39 psi respectively.

However for winter I have put 205/55/16 tires on it (my daughter is now driving it).

What pressure makes sense in this case for front and rear? 32 all around or 32F 35R, or ??

Thanks

[Azn Kenny]

The recommended tire pressures are based on vehicle weight, so you will maintain the same pressures on both sets.

[iXguy]

The recommended tire pressures are based on vehicle weight, so you will maintain the same pressures on both sets.

Similar discussion with my friend who has an Audi S5. I can find Audi documentation detailing different tire pressures for 20" vs 19" tires on the same car, as both were options.

Googling further, even more divergent pressures for 18" and 17" wheels on the Audi A5 which is the same car in a less sporting edition.

As we were installing 18" snows, I followed the pressure recommendations for the 18" wheels on the A5 rather than the stock 20" wheels his car came with. Did I err?