Good question. Model #FD-5501 (it came off an old Trek 1400). Rear is running 105 rear 9 speed. Shifters are model #SL-R660 (left, front) and #SL-R440 (right, rear).
I find the cross-over rubs from maybe 6/7/8/9 on the small ring, and 3/2/1 up on the big ring. Some ratios there you can do without if it really bugs you.
Jim