Not a clue. I just recalled and verified that there were some issues discussed back in '02 where one of Santana's dealers offered up the explanation of the flawed run of rims.

Again, you can contact the folks at Santana with your frame's serial number and they should be able to confirm if there are any issues that require your attention. In fact, I wouldn't even introduce the internet discussion... just tell them the year, make, model of your tandem and let them know what type of rim and tire you were using. They'll take it from there as I'm sure your situation will not be new to them.