I've heard that Sastre used a 39/27 up Alpe D'Huez (though that doesn't necessarily mean he was in the lowest gear). Contador used a 34/28 on the Zoncolan. The Zoncolan is a crazy climb, however, with stats almost as tough as Mount Washington.what are the pro's cadences up climbs these days? Maybe the rest of us mere mortals should aim for a similar cadence, but obviously a slower speed? Hence running 34-27s makes sense?
Also, you may need to consider filing the bottom of the mech hanger to get it down a bit further. I did this on mine after a year of the aforementioned chain throwing. Mech was still too high so I filed the hanger slightly and the new position is just as secure but low enough that I have stong instantaneous shifting using a 10 year old mech on a 1 year old compact chainset.Notso Swift said:Not sure about anything other than DA, but just adjust the front down a couple of mm and you will be fine, allen key and 20 sec of your life is all it takes (too much gap and you are more likely to drop the chain outside going into the big ring)