My local outdoor pool has a chin-up bar (as part of a deployable multi-gym thing), but because it has to survive the elements, it's just a plain galvanized steel bar. The bar is less than an inch in ...
I've been working through the set of plates on a pulldown machine (w/ v-grip) trying to get to the stage where I can do chin-ups. At 90kg now, not far off my bodyweight of 102kg. But the pulldown ...