Originally Posted by joelsp

I don't know. It just seems like there is more strain on the headtube when a suspension fork is in place. I kind of noticed that as suspension forks became more and more popular some years ago, the head tube sections of bikes became gussetted more and more, I figured this was because suspension forks are succeptable to a bit of twisting and things, and so they put more strain ont he headtube.