Originally Posted by
rydabent
Back in the days of the 10 speeds, a rider had to do a few double shifts to get progression. That meant he had to shift both the derailer and the chain rings. Really dumb IMO.
Double-shifting is actually extremely easy to do on bikes equipped with downtube shifters. And on modern Di2 setups, it will double-shift for you in synchro mode. It's actually a very smart way to use all of your gears.