Recreational cycling marathons are a kind of attractive sport event where a bunch of riders ride a different courses without competing between each other. In the last fifteen years, sport became popular for people of all ages. Therefore, many recreational cyclists has joint to such events in order to test their abilities, have a good time with friends, meet new people, and take care for their health and body. Collecting registrations of cyclists in the events was difficult to manage because of a large time complexity. In the past, each cyclist had to print the registration card that was uploaded on the organizer's webpage, fill it and send to over the classic post. Today, the problem is worldwide solved by using the online registration system. Participants from different countries can register themselves over the Internet. This paper presents the common pitfalls and learned lessons in the past four years, when we began developing such solutions for recreational cycling marathons.