There was a time when shifting was an art. Friction down-tube shifters required a finess and a light touch of the fingers; a slight overshift to pop the chain onto the cog, and then ease the shifter forward to rest the chain perfectly in its place. Over time, and with the advancement of technology, the art has slipped out of shifting, first with index shifters, then with STI and Ergo shifters – until finally, with Shimano’s Di2 electronic drivetrain, the rider is completely removed from the act of changing gears.
For those of us still riding cable-powered drivetrains, there is still one artform remaining: The Double-Shift. As I approach a climb, I start to tingle with anticipation as the road starts to point upward and I feel the pressure in my legs growing. I’ll gradually shift into lower gears as the gradient increases until I start to near the end of the cluster. Enter the Double-shift, my favorite of shifts. On my Campy Ergos, I just pop both the Go-Buttons at exactly the same time, dropping the chain onto the inner ring in front and dropping it down one gear in back, making a perfectly smooth transition to the next gear. (The Double-Shift on STI is still possible, but feels somehow less dignified.)
When executed properly, it all passes so smoothly and silently that you hardly noticed a thing; the only clue being that moments ago, you were slightly over-geared and now you are in the small ring and pedalling smoothly. It is also a gamble; the change in chain tension in the Double Shift is prone drop the chain entirely; resulting in a catastrophic flail to get the chain back on, either through a front dérailleur Hail-Mary, or a full stop to right the chain onto its ring.
Indeed, it is a thing to cherish, the perfect double shift, and I’m not ashamed to say I congratulate myself with every successful execution.
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I am so relieved/glad to learn that double shifting is OK. I do it quite often in prep for those hills, and feel quite slyly triumphant on successful smooth execution but always had that little thought in the back of my mind, 'maybe this could be bad for the gears/chain, wear it out quicker or cause things to become misaligned or even my chain to drop' I am in some ways a very inexperienced velominata, its sites like this with its vault of info that help me learn, as well as the boys at my fav lbs who can get so chatty about cycling stuff, love it.
@jojo
Frank will correct me if I am wrong, but I think this is the first time on this site that the term "velominata" has been employed by a velominata. Well played.
So this is where di2 and iPhone apps lead to... Why? Who asked for this?
Sigh. Stupid design project. Mutter/grumble etc.
http://prollyisnotprobably.com/2011/07/the_toyota_prius_projects_conc_10.php
I guess this parallels work by Ecole Polytechnique Federale de Lausanne where brain-computer interface technology is being applied to create thought-controlled wheelchairs, or the work that Cyberdyne is doing on limb movement - but surely this is a solution looking for a problem in the wrong place.
It is a beautiful thing! I was beginning to think that nobody else knew what a joy it was to hop down to the small ring while "reloading" or upshifting the cassette in preparation for a climb. all the while silently maintaining a nice steady cadence.
The reverse move is just as sweet right after the crest of a hill.
I was pleased to find that this works just fine on the Di2 system just as well, once it is programmed to shift 3 on a button hold. My RX100's still do it faster though.
Thanks for a very good article.