Hello!

The serial number that my bike has doesn't fit any of the typical serial numbers.

Serial #: WBT 5178U

I was hoping you could provide some insight into my bike.
The frame says it's a Nishiki Aero II. The front and back derailleurs are Suntour Cyclone M-II. The pedals are Shimano 600 OX (I think. The OX looks funny so I'm not entirely sure). The crankarms are Shimano DuraAce and it also says JAPAN 170 on the inner side of the crankarm. The seat says Kashimax aero and the seat post says Laprade.

I am not really sure what to glean from this.

Thank you for the help!