I had a triple chaining, for both my trips, a 52-42-26 and didn't regret it. Of course, climbing Ventoux, Galibier and company is a little longer with 65 lbs load on the bike but I did them all without walking with the bike!!! My suggestion is train in the hills beforehand. Have fun...

Kati
http://bicycle_girl.crazyguyonabike.com