That bike is going to have what used to be the standard 68mm English threaded bottom bracket (BSA) shell. So you wil need to use a BB for that size shell and matching cranks with a 24mm spindle. I dont know whether Rotor makes a crankset with a 24mm spindle, but Shimano crank/bb combo (Ultegra, e.g.) or SRAM GXP crank/bb combo are good options. Campy cranks and BB also would work.

Updated to add: Hmm, seems Rotor makes a BSA30 BB for making their 30mm spindle cranks work with BSA shells. So that combo could work for you.