@2late2be, well, I seem to get the biggest weight impact by combining two of the three triathlon activities in a single workout. For example, ride 15 mi, and then transition to run 5k immediately (called a brick).
Riding alone doesn’t impact my weight much. Not bad for maintaining, though.
I’ll tell ya, I’ve seen some really large muchachos that are actually some very fast riders. So while biking might work great for some, it’s not a sure-fire weight loss tool for everyone.