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When I was in the Phillipines they went out as a team for the record with the peloton a stream of lead out men. The flat 200 was done in 5:56! Like ACP, Audax PH don't have a max speed rule.
https://audax.ph/content/files/uploads/978e8ab9-9753-4755-afd1-ce5da286a055.pdf
I'm not a huge fan of organisers publicising and celebrating course records or publishing result times, it makes it more like a sportif, but each culture develops its own and our view of audax doesn't necessarily need to be universal.
Saying it isn't a race, but then publishing results in order of finish time is a bit contradictory...
Re unofficial course records, I think there are a few people who have done the Bryan Chapman in 24hours. Ritchie Tout, the previous organiser, is cetainly one. And I think Nick Gardner might have done it too. Maybe even together - the fast guys in audaxes are normally riding in a little group rather than solo, which obviously makes a difference to speed.
I've heard there are other unofficial records, or standards, for courses - but it's only a very small group who were in on it, and as a private thing - no public bragging rights!
Tom Deakins once told me that Gethin Butler rode one of his events (with a couple of mates) and got round in under 6h40, ie average speed of <30km/h. He rode it as a training ride so wasn't too bothered when he was told he couldn't get it validated as it was outside the time limit.
After I heard that story, about 10 years ago, I thought it would be fun to have a go at being too fast, so got my TT bike out for a flat 200 and tried it. I was on track to the first couple of controls but couldn't hold it all day. As always, it's the stops that kill your speed.