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My everlasting memory from the Paris-Geneva leg of Ride25 was coming down a hill around 40mph, and hearing the 'ring-ring' of a bike bell as one of the Brompton's came past me sat up straight, I nearly fell off laughing... he confessed that he'd been pedalling like mad to catch me and sat up at the last minute, he reckoned a few more mph and he'd be getting a front wheel wobble...
There's always a few on PBP. I remember descending on the dark, in pissing rain, and being overtaken by someone on a Brompton in a super aero tuck!
It would be interesting to see what causes the most failures for these ultra distance rides.
Tyre sidewall tears and rim failures seem pretty common, much more so than I remember from audax.