Can't give you any info myself - cause I don't change them
But you can try this link from Goodyear:
http://www.goodyearaviation.com/boeing_b747.pdf and if you want to know everything
else about aircaft tyres:
http://www.goodyearaviation.com/img/...irdatabook.pdf and
http://www.goodyearaviation.com/tirecare.html