If you prefer to use an automatic BPM counter MixMeister has one you can download for free. Here is the link.
In just a few hours you could be an expert at mixing music and creating your own seamless Indoor Cycling class playlists. Lesson 1 explains how to convert all your iTunes music to a format that will work with this BPM counter.
Cadence Revolution
Group Fitness Talk Radio
The Indoor Cycle Instructor Podcast