Looking at the over-all condition of the bike is the best way to judge whether the km's look genuine.
If it looks like its all immaculate and original then the k's are probably true, if it looks like its had a hard life and has heaps of wear and tear then maybe it has been wound back.
At the end of the day its the mechanical/cosmetic condition of a bike/car that is important. I would rather buy a bike that looks/sounds/rides brilliant and is in good mechanical condition with higher k's, than a bike with a low odometer reading that doesn't seem like it's been looked after.
Good luck with finding the right bike!
"How fortunate for governments that the people they administer do not think"
"At least black people knew when they were slaves, you remain clueless" - Doug Stanhope
Bookmarks