What is the difference?
Check the compatibility map, Shimano trekking groups tend to use big chainrings compared with MTB groups, so the shift levers might be designed to work with a road FD.
There may be a different front shifter. But these are just rear shifters.
Also I thought the pull on a road or mtb front shiter was about the same. Where triple=triple etc...
@tallsam started
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Check the compatibility map, Shimano trekking groups tend to use big chainrings compared with MTB groups, so the shift levers might be designed to work with a road FD.