John Hughes has some worthwhile articles on his site:
Endurance Cycling
Training for Brevets Part 1: Base endurance training.
Training for Brevets Part 2: Building power and peaking.
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What to Wear in Various Weather
Do you have trouble deciding what to wear when the weather is uncertain? The pain of late autumn/fall cycling comes from not knowing what to wear on any given ride in the fluctuating colder weather. John Yoder found that David Ertl’s guidelines for what you might wear across a range of temperatures was a great…
Ultra-Distance Cycling Tips
Useful tips for novices and experienced randonneurs alike: http://www.active.com/cycling/articles/ultra-distance-cycling-tips
Preparation for Randonnees
UltraMarathon Cycling Association has lots of useful articles listed on their site:
How hard is it?
Damon Peacock has recorded some insights into Audax (Randonneuring)
Audax
Audax is a cycling sport in which participants attempt to cycle long distances within a pre-defined time limit. Audax is a non-competitive sport: success in an event is measured by its completion. Audax has its origins in Italian endurance sports of the late nineteenth century, and the rules were formalised in France in the early twentieth…