Riding fast up long climbs is all about your functional threshold power. Here are three training sessions to help you to improve yours.
Long climbs, like the Alpe d'Huez will push you physically, but they're also one of the most satisfying parts of riding your bike. Improving your times on these climbs takes work, and this video will definitely help you out.
These climbs are all about your FTP (Functional Threshold Power) and your ability to ride at it for long periods of time. The good news is that you can build your functional threshold power without a power meter and without hills.