Originally Posted by
rmfnla
Not really an issue with stems since they are Al alloy and the threads will strip before the tool interface.
More likely Torx are used to look cool...
On the Ritchey C260 stem, from what I've read, they started using the T20 bolts because the hex bolts they originally used were getting stripped at the head.
I'd be fine if all the bolts on a bike were torx. I don't like that only some are as it just makes on the road repairs more difficult. Not all of my multi tools have them (some are a few years old)..