Self-proclaimed 'redneck'.

Most 'rednecks' I've met are secure in themselves out on a nature trail, and most recommend wool instead of steel as a more portable security blanket.

Will you be asking would-be attackers to kindly wait for you to stabilize yourself on the ground in a ready position after having dug your firearm out of the reassesses of your bag, or will this just be a 9 mm cap-gun with enough kickback to seriously ruin your ride, at which point you'll be on your kiester tangled in a bike and vulnerable to attack by whomever wants to part you of your firearm which will so obviously miss its not even a plausible enough scene to make it into action movies?

Can't you just ride away real fast after hitting them with the big stick that fits so nicely in your you bike-polo-malet holster?

....I recommend panniers.