Last night while hammering out an after work ride on my single, I was thinking about this discussion and hoping my luck on the Pro2 tires held out - it did, as usual for the last year.
As I recall, the only tires we ever had repeated severe sidewall thread fraying were the 25mm Gatorskins mounted on Sweet-16 rims and typically pressured at around 130-135psi. Perhaps while that pressure seemed high enough, the tires felt rock solid and seemed to give decent handling, it may have been on the low end for a tandem team setup (according to
http://www.precisiontandems.com/arttiresbymark.htm) which implies 140psi was the correct pressure.
I am curious how a chart such as the above applies to my Michelins of choice which have a max inflation of only 7bar/102psi? Oops?