ooof, did anyone do this?
I didn't see many retrobikes - not one bike with rigid forks and 1 bike with v-brakes - discs seemed to be the order of the day.
Managed to finish the 100k but at a terrible cost
I decided to take my sub 10 kg weightweenie FS bike that has tiny saddle and that saddle nearly killed me. After 2 hours I was in agony and it must have partially cut off the blood supply to my legs (not to mention gentlemen's parts) that I had nothing in my legs, the next 4 hours were a real struggle .... and to cap it off, got cramp in my left leg twice. Absolute nightmare of a ride.