If you want to learn more about concealed carry self-defense, I suggest a ccw-centric forum, like glocktalk.com's, concealed carry sub-forum. While a Glock-centric site, it is probably the best for any concealed-carry firearms question. Lots of active and retired law enforcement, lawyers, concealed carry citizens with decades of experience, and let's not forget Mas Ayoob is a frequent contributor (For those not in the know, that would be analogous to having Lance Armstrong regularly posting on bikeforums.net's '41').

If you want to learn more about cycling, I suggest a cycling-centric site like bikeforums.net

However, the number of people that concealed carry WHILE cycling is low. And, the fact is, there are specific concerns that you have to deal with while CCW on a bike that you don't have to deal with otherwise. There IS room for such a cross-interest discussion, but there is no forum that specifically deals with concealed carry cycling, nor is it likely that one would generate enough traffic to remain in operation. So, such conversations must need happen either on a bike forum or a gun forum.

The reality is, I've gotten more response on bikeforums.net from cyclists who carry than I have on glocktalk.com from carriers who cycle. And, after filtering out the responses from people who aren't part of the cross-interest group, the information is more useful.