If I remember correctly, the sport has a triple chainring crank set.

It looked like a very good, versatile bike. I liked the braze-ons.

(Now that I think back on it, I looked at the gaps between the rear tires and the seat tubes, and the sport had more room there. I don't remember which Tricross(es) I was comparing it with, but there was disctinctly more room. From what you've said, it may have been a model other than the comp....)