I'm building up a cyclocross frame and beginning with my touring bike parts and I'll upgrade from there. The cyclocross frame I have requires a top pull front derailleur and I'm having a hard time find one in a road bike model. Do most cyclocross use mtb front derailleurs? I have triple rings and tiagra shifters. Will a top swing XT front derailleur work with these shifters? What other options do people use for top swing/pull front derailleurs?