Originally Posted by
Plainsman
She has the last generation 105 shifters, that were used for both doubles and triples. When I do this, what will be the effect of having one extra "click" left in the shifters?
I have two bikes that use the same (Ultegra 9-speed) STI shifters. My tandem has an Ultegra triple crankset and my road bike has an FSA compact double crankset.
The shifters have 4 shift positions. On the tandem I have 1 granny gear position, 2 positions for the middle ring and 1 shift position for the big ring. On the compact double I get 2 shift positions for each chainring. I'm pretty sure that's the way that Shimano intended because I also have Flight Deck computers on both bikes and they always indicate the appropriate chainring.