Chart for a kilo tt from Bikes Direct:

http://www.cyclesmercier.com/geometry_tt.html

The 57 has a standover of 839 mm or 33.0314960630278 inches

http://www.convertunits.com/from/mm/to/inches

The bar is level regardless of the seat tube and the head tube, so in the middle it's the same too.

The 53 is 800 mm (31.496 inches) and the 55 is 820 mm (32.28 inches) standover.