Small in front, avoid 2 smallest in rear
Middle in front, use any rear
Large in front, avoid 2 largest in rear
At least that's what my 1st first adult bike manual (Schwin) recommended for a triple front x 8 speed (Shimano Tourney). I ride a Bianchi w/a Shimano 105 compact front (50/34) now, you don't have to worry about crossing with only two fronts.
Last edited by TomD77; 01-22-13 at 05:21 PM.