Originally Posted by Hitchy
...to qualify as an 'audax' ride (international cycling organisation) any distance must be covered at an average speed of no less than 15kph.
Hitchy
Not quite, but near enough for the imperial century.
The 15km/h minimum average in Audax events/randonnees applies to distances between 50 and 600km. Over 600km (say 1000, 1200, 1400), the minimum is 15km/h for the first 600km, then changes to a lower mininimum thereafter (it can be 11 or 13km/h) to take account of the additional sleep time required.