It depends on who they are, who they work for and the philosophy of the publishing company. I think most specialist journalists start off with a passion for a particular interest and the journalism develops from there. If you’re good, you should be able to write about pretty much anything, but personally I don’t think you can fake passion for something like mountain biking or motorcycles.
Bauer, who were emap, have a contrary philosophy, where they train journalists then expect them to be able to work on any of their specialist titles, but people tend to gravitate to the stuff they’re interested in and you can spot fake enthusiasm a mile off. Have a look at Trail Magazine for a great example of a mag’ written by people who claim to ‘live for the outdoors’ but actually live in Peterboghorror…
Cynical, moi?