The present disclosure is directed to intravascular devices, systems, and methods having a core wire with multiple flattened sections. In one aspect, a sensing guide wire is provided. The guide wire includes a first flexible elongate member a sensing element positioned at a distal portion of the first flexible elongate member and a second flexible elongate member coupled to the first flexible elongate member such that the second flexible elongate member extends distally from the first flexible elongate member and wherein a distal portion of the first flexible elongate member includes at least two flattened sections, and wherein the first and second flexible elongate members are coupled along a portion of one of the at least two flattened sections. In other aspects, methods of forming a sensing guide wire are provided.
