I bought a new MTN bike frame recently and want to slap on a practically new Deore rear derailer I stripped off an 8-peed Trek. I figure I won't have a attaching it to a 10-year-old, 7-speed Shimano cassette that's still in good shape (though please tell if I'm wrong).
My question is: Can I use an old Shimano bottom-pull front derailer that, in fact, came off of a 7-speed MTN bike.
As for the triple crank I intend to use, it too came off of a 7-speed, though a different one from the front derailer.
What should I be looking out for?