That really depends on the bike!
Honestly, though, if you're riding that far, OC would be far more comfortable.. otherwise a shoulder holster would be about the best bet in general, though you could use waist-position holsters of various types depending on your vertical angle on the bike (obviously appendix-carry wouldn't go so well on a sport bike, for example..)
I dunno, I have a gentleman that is well into his sixties shop with me at work, and he rides an 1100 sport bike..
They're not my style, though..
I'm thinking that if it's to be concealed, a shoulder holster is the way to go. I'd want one with a retention strap or something, but the majority of your options will have those..
I haven't got that figured out quite yet either.I do need more practice drawing and shooting while riding.
I knew one of yea would call me out....now where is that foot locker