The tri-bike I tune uses 650c, 12-23 rear, and 53/39

The Paramount I'm building uses 650c, 13-23 rear, and 56/42, though I'll probably go 9-sp w/12-23 rear.

I'm tempted to offer the tri-girl racer my chainrings for her events. If it would aid her speed, I would.
She trains on a road bike with 53/39 and 11-24, but I've never seen her use the 11t.