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This thread flatters me. I did have the assistance of an 11-36 cassette though I'm considering christening the single speed Cielo with another go in a few weeks.
Plenty of the there-and-back riders have done it single speed. Gear for the climbs and it limits you from going too hard on the flatter bit towards Winchester. Be prepared to walk a few of the steeper climbs near the end too, it won't be much slower anyway.
Well done @Howard and @AdsH. Certainly the toughest 100 miles I've done.
What I'm taking from this thread so far is that @Jon. possesses superhuman powers.