Brake Calipers on OCR Composite Bike

[mgkaplan]

Does anyone know if a Dura Ace or Ultegra brake caliper will fit on a Giant OCR Composite bike? The bike comes stock with what appears to be a no-name long reach caliper. I am considering an upgrade, but do not know if the standard calipers will fit.

[ozelise]

OCR has long reach calipers which give better clearance for taller tyres if you choose to run them. The Ultegra equivalent would be the Shimano BR R600 if you wish to upgrade.