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Yeah I am waffling about bike choice as well, but anyway it's an important point for everyone if they aren't feeling their best on the day that as you say it's a figure of 8 so can turn back if the first 25/30 miles aren't going well, and after we start coming back east can stay south and cut at least 20 miles off the route (and some elevation if take some slightly busier roads)
i was looking at this thread thinking, hey maybe doing it fixed would justify the travel.
there would be a mid-2/3rds bailout option from Brecon with a straight return to the start point.