Originally Posted by
Robert_in_ca
For the rear der. you can use a road der. as long as it is a long cage, because you're using a triple up front.
But mountain bike derailers have better range and capacity. Go with an XT for zootness or LX for economy or Deore if you're a real cheapskate
(The Deore is a good derailer and probably one of the best bargains out there.)
Road front...Tiagra is best...to save headaches.