Preface: this is an old steel road bike, and i'm pretty sure its a 7/8" (21.13 mm?) seatpost.
As I got more and more into cycling, I realized my seatpost was too low. I finally got it into a good position, leveled out the saddle and everything went fine for about a week.
then I converted the bike to single speed and something happened: my seatpost started to bend!
Its sitting right at the max height line, so i'm not exactly going beyond what it was supposedly designed for, but wth? I'm guessing that in switching to single-speed, I do a lot more pulling of the pedals (I do ride clipless) and its the pull added to my 240lbs of lard-butt that's doing the bending.
my question is, 1) have other clydeish riders experienced this and 2) how do I prevent it, a longer seatpost so I have more of it in the frame at the height i need?
also, is any specific seatpost material less prone to bending? this one looks like aluminum, but given its age, I'd say its not a very good alloy.