A thread on this subject on Bikeforums ran to pages and pages...
Some expressing utter horror that a bicyclist would feel the need to be armed, others ridiculing the whole idea, others with decent suggestions.
I'm a cop, I know that numbers of cyclists ride in conditions that are less than optimal.
We have had armed robberies and muggings of cyclists here in St. Louis, usually the bad guy is after the high-end bike.
As well, mountain bikers have been attacked by cougars in Western states.
Bicycling magazine detailed several such incidents while I subscribed.
Rare, but possible.
First up.
Having the weapon concealed on the bike is rather a bad idea if the intent of the bad guy is to steal the bike...
Your first indication of anything wrong might simply be a pedestrian knocking you over at an intersection.
Now, he's got your pistol too...
Unfortunately, cycling gear isn't much designed for concealed-carry.
I have a little Taurus 2" 38 special as an "off-duty" weapon.
Drops right into my jersey pocket.
Sure, it "prints" there.
But then, I'm a cop...
I don't care.
A reasonable idea is the "fanny pack" (I've just been informed that Aussies call them "bum bags"...).As far as I know, you can still buy a fanny pack that is designed specifically to carry a firearm....
bicycles.stackexchange.com/users/1297/M. Werner
Seems like stuff made for joggers could work for cycling.
http://www.activeprogear.com/jogger_holster.html
Would a small triangle frame bag work?
The kind I'm thinking of seem about the right size to hold a small-to-medium pistol, and fit on the rear end of the top tube.
Some sit on top, secured by the seat post, some hang under, secured by the seat tube.
Lots of options... http://www.google.com/images?q=triangle+frame+bag Or a frame bag designed to attach to the front of the top tube.
Or a handlebar bag...
bicycles.stackexchange.com/users/76/freiheit
I have a Bike Nashbar frame pack that would definitely fit a compact frame handgun:
bicycles.stackexchange.com/users/17/Drew Stephens
Just ran across a line of holsters that look interesting.
Relatively low cost, so I may have to try one out to see how well it works.
http://www.pistolwear.com/
bicycles.stackexchange.com/users/349/Brian Knoblauch
I have one like the Nashbar frame pack, different brand but substantively the same thing.
Sucks that my Kahr PM-9, small though it is, adds pounds to my ultra-light bike, but in certain areas, I'd much rather not leave my firearm at home.
bicycles.stackexchange.com/users/None/
First off you'll have to wear mostly regular clothes.
Using an inside-the-waistband holster will suit you well.
You can tuck a shirt in over the holster, then if you wear a jacket over that, it will be completely hidden.
I have an MTAC holster , and I sometimes carry when I am buying or selling stuff from craigslist.
I've never had issues where it became visible that I was carrying.
bicycles.stackexchange.com/users/683/whatsisname
One option that works well for me is using a belly band holster and a Ruger Lcp.
It hides easily under my cycling jerseys and is comfortable and secure even on 70+ mile rides in the heat of summer.
The only real issue is that the sweat can corrode the non stainless slide and spare magazine.
If you can spring for it get your slide and magazine covered at Robar in their NP3.
If not be sure to clean and re oil your gun after every ride.
bicycles.stackexchange.com/users/26472/David A. Great Lakes State
I use an Assault III backpack with a waist strap and a drop leg holster modified to attach to my hip using the leg platform as a pad.
I have a Glock 29 and it works well on a mountain bike.
bicycles.stackexchange.com/users/3708/MTBR
I pedaled my bicycle from Seattle to key west carrying two guns .
I used two safepacker holsters strapped through the waist band for a Fannie pack which was attached around my waist.
Just Google safepacker holsters to get to the sites .
On the early portion of the trip I carried a 44 magnum Alaskan redhawk, then switched it out with a glock 20 and ruger 380 incase my primary malfunctioned .I switched the 44 magnum to the glock 20 after I was out of the mountains.
My every day carry on my bicycle around Miami beach is a glock 29 and a ruger 380 still using two safe packer holsters.glock29's are serious firepower as is the glock 20 and 44magnum Alaskan red hawk.
The 44 magnum will will take care of all natural threats I am told while the glock 20 has a tad less firepower.
bicycles.stackexchange.com/users/17068/Jim
I carry either a Sig938 (9mm) or a S&W 640 Revolver (357 Mag) in a TommyGun fanny pack works like a charm
bicycles.stackexchange.com/users/33665/Dennis
For those of you that happen to cycle through rough neighborhoods and are able to do concealed carry of firearms...  Wondering what you wear to conceal them that works well while cycling.  Obviously the standard cycling outfit isn't going to do any good whatsoever...  Various back/fanny packs seem like they'd be inconvenient.  Most jackets that would work fine while walking would tend to "ride up" I'd think.  Just curious as to what works and what doesn't work.
How to carry a concealed firearm on a bike?
bicycles.stackexchange.com
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bicycles.stackexchange.com/questions/2401
bicycles.stackexchange.com/users/349/Brian Knoblauch
Fanny packs, frame packs, holsters and assault backpacks are some options for carrying a concealed weapon when cycling. Obviously the rider would have to wear normal clothing not cycling gear for the weapon to be concealed. There seem to be many ways to carry a concealed firearm on a bike. A solution would be to use a fanny pack, which is specifically designed for that end, or a frame pack, such as a Bike Nashbar frame pack. It is also possible to use a waistband or leg holster, often paired with straps or fanny packs. Finally, it is important to wear regular clothes on top.
A solution would be to use a fanny pack, which is specifically designed to carry a firearm. Some people prefer using a frame pack, such as a Bike Nashbar frame pack. It is important to wear regular clothes to conceal your firearm. It is possible to use a waistband or leg holster, often paired with straps or fanny packs.