I started using 184 mm cranks in June 2011 and have seen an improvement of 1 kmh from 9 to 10 kmh on the edge of the Gorolo (last of the nine hills). This is the result of a significant increase in acceleration and speed in the plains compared to my experience with traditional 170 mm cranks.

Claudio Savini
Professional Cyclist in the 80s and Cycle Mechanic, Venturi Cesena