The wheels indicate that at least one of the wheels was changed. The seat, tires and handlebar don't look stock either - without more pictures its hard to say. How old is the bike? What model? Was it crashed? If it has a carbon fork, and was crashed, you may want to check the fork closely. (Not saying it was crashed - but hard to think of a reason why only one wheel was changed/upgraded).

PS: there is no Sirrus 4 - there is the base Sirrus, Sirrus Sport, Sirrus Elite etc.