Hi
Apple Watch does not seek to convert cycling activity into an equivalent number of steps taken. It aims to count steps in respect of steps actually taken.
For the most accurate tracking of results from bike rides (in terms of calories and other data), record them using the Workout app, choosing Outdoor Cycle as the activity type. For cycling workouts tracked in this way:
- Available goals are: calories, distance or time.
- Available primary metrics (shown on the watch during the workout) are: elapsed time, active calories, total calories, heart rate, speed or distance.
- Available time metrics (also shown, at the upper-right of the display) are: time of day, elapsed time or speed.
If the paired iPhone is also taken along (with Location Services enabled), the watch can use GPS data when estimating speed and distance.
More information:
http://www.apple.com/watch/fitness/
Use the Workout app on your Apple Watch - Apple Support
Use the Activity app on your Apple Watch - Apple Support