Welcome. Interesting bike. Looks to have JE date code, which would be May 1998 production. There were no disc brake USA models until 1999. If the XTR is original, that would indicate a top of the line model, such as the F3000. But in 1999, the upper models had CAAD4 frames and Fatty SL forks. It looks like your CAAD3 has a Fatty D. The 1999 F900 was CAAD3, Fatty D, with disc brakes. That's the closest model I have seen. Your bike could be some kind of pre-production test bike. It's really hard to say when the spec doesn't match anything in the catalogs. What brand are your brakes and crankset?