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@BringMeMyFix
I've been round in a fast geared group - 4 laps in about 1.05 - lots of twatting about on the first lap, but by lap 4 we weren't dipping below 30mph on the flats.
On fixed, I reckon you'd need something in the low 80s to carry enough speed on the downhill bits, but still be able to keep your momentum going upwards.
Not my cup of tea though really - I'd rather do this challenge.