My Glock, Walther PPK and Kimber Ultra carry all fit and carry unnoticed in my belly band with the firearm in the small of my back, even with riding bibs and jerseys.
I also have a Kel Tek that fits in a special holster that hangs around my neck. I always carry when I ride 99% of the people in my group have no idea, the 1% that do know because they carry as well.