Okay so when I did my bike build i just picked up a cheap Dura Ace FC-7402 double 8 speed crankset, mainly to get me by until I could upgrade. I'm currently using Shimano ST-5603 shifters, which are 3x10. I'm having problems shifting properly. My rear shifter is perfect, no problems what-so-ever. I was under the impression that the triple shifter would work fine with the double crankset. My front derailleur is the FD-5500. My problem is that the front derailleur won't shift far enough to actually make the chain switch chainrings. The indexed positions of the shifter are too small to move the derailleur far enough.
Is there something I might be doing wrong? Are triple cranksets spaced a little closer together than the doubles or are newer 10 speed cranks closer than the older 8 speed?
I don't really want a triple crankset, I just got a really good deal on the shifters, that is why I got the triple shifter.