BMW 323i Owner's Manual page 214

Tire size
All pressure specifications in the table are
indicated in psi/kilopascal with cold tires.
Cold = ambient temperature
Rear: 255/35 R 18 90 Y
Front: 225/35 R 19 88 Y XL
Rear: 255/30 R 19 91 Y XL
More details on the permissible load and weights can be found on page 257.
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Online Edition for Part no. 01 41 2 604 582 - © 02/10 BMW AG
Pressure specifications in psi/kPa
Traveling speeds
up to a max. of
100 mph / 160 km/h
- 41/280
38/260 -
- 45/310
Traveling speeds
including those
exceeding
100 mph / 160 km/h
- 44/300
41/280 -
- 48/330