mines 101492 (silver) On the left side of the bike it says MFG IN: 1/06 on the sticker. Somthing tells me it starts at 100000, your's being bike #917, regardless of color. Otherwise the numbers would only accommodate 999 bikes in each color. Example- #100= black, #101= silver, #102= blue .
Of course, I know jack shoot about this, so i'm only making an uneducated guess. :-\