I fitted a new rotor to a new wheel yesterday (6-bolt) and didn't have any spare bolts so borrowed them from another bike. As I go to buy replacements, is there anything special about such bolts? I know they're generally Torx button heads, but I can buy them in steel, titanium or even aluminium.
They're not expensive, and they'd be useful elsewhere on the bike (I'd get stainless) but I prefer socket head screws in general because I don't always have a T25 on me, depending on which tools I'm carrying.
So is there anything special about the material or shape?