Most of the things i read about belts say more like 60k or more. I once asked at a harley forum what they get out of a belt and the lowest was i think 60k. Many were reporting about 100k.
On the issue of triumph's recommended tension being uber tight once hot, i'm going to see if i can get ahold of a rep tomorrow and see what they say about it. I'll also call mickey cohen and see how his advice differs. We live in a world where you can ask a question of a panel of highly regarded experts in any field and get no 2 answers that are the same. Man, it's so hard to get correct answers today !