The International Organization for Standardization (ISO). First edition. 2005-05-15. The text of ISO 16881-1:2005 has been approved by Institute of Standards and Industrial Research of Iran (ISIRI) ISIRI 10363-1 without any modifications. 27p. This part of ISO 16881 gives the requirements for the selection of the size for iron or steel wheels and presents the formulae for the local stresses in crane structures due to the effects of the wheel loads.