Audax events are not intended as races, but the randonneurs events involve recording of finishing places and times of all participants and so many treat it as an endurance race.
The usual good organising by Surin Audax Randonneurs club made this a memorable experience. The event sheet is written in Thai, which means I cannot understand a word of it. I was riding fairly quickly so ran out of riding partners by the halfway point and, inevitably, got lost...at the next checkpoint the club official would not stamp my passport until I had made up the 20km I shaved off with my accidental shortcut, but he offered me a perfectly good route to achieving the fix, and was so good humoured about it that he cut through my exhausted exasperation [180km already ridden] and I was pleased with the opportunity to back-track and repair my mistake.
A lesson for me...try to ride less hard so I don't run out of Thai language riding partners.
I was 8th finisher out of about 200 participants, and was quite pleased with my performance. The Gipiemme road bike worked fine, and I had no worse damage than a mildly sore bum and a few blisters on my hands. This was 50% longer than my previously longest ever ride, but did not feel like I was at limit.
Many of the riders used aerobars, and some rode high-end TT bikes...next time I might try that!
Here is the Strava record of the ride: