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More aero too! You should be able to pick up a cheap 54t narrow wide (or 50t if you're concerned about your bottom gear) for China. 11-28 cassette should be fine too.
I'd be considering 130bd square taper cranks for potential low-q factor fiddling, and cheapness.
umop3pisdn-
Good point, I'd personally moved away from square taper with my builds but useful to know they still have a place. A 50t ring might be the way forward what with the course and also making the bike more appealing to train on. Will look into what external bb/square taper chainsets share BCD so can keep the chainring if my BB falls out on the first lap.
jambon
I 'd presumed double as the frame has a brazed front mech mount, but single would be in-keeping with budget TTing and also fine for the local 10?