What is the difference in value of a last-year component, and the equivalent one from this year? For example an SLX rear derailleur, an X0 crankset, a Fox Float fork.
How substantial is technology trickle-down. If a brand new bike from last year costs x, and the frame is unchanged, what could be expected the worth of the components to be, compared to the 2014 model? For example 5% less?