One suggestion per answer please. That way the community can vote up or down whether they think the suggestion is a good one.
There was a question that was recently migrated to Fitness SE. This seems like an obvious fit for our migration list. Even though training regimens are unique for cyclists, there are some questions that are more universally applicable to all endurance athletes; questions about diet and cross training are what immediately come to mind.
There is a tag "cycling" in Sports SE with questions about professional cycling. Some fit equally well on both, it seems that some of them could be even moved here.
I've seen a number of questions on this site that could fit in Physics SE just as well as they fit on our site. Some fit equally well on both, but it's easy to envision one that truly belongs over there.
I'd like to see migration to Health.SE -- we have a decent number of health oriented questions.
Question that are mainly about software selection and barely about bicycles could fit better at Software Recommendations.