If it's rolled over then there is no way of telling. The Aspencade had an extra digit so if it rolled over it would read say 181000, but they were very easy to fiddle the numbers on. I believe the GL1200 Asp and the GL1500 are very easy to fiddle the mileage on. Never did this myself of course, just heard about it.
Not sure about the kms thing, some of the Canadian lads will be able to clue you in on that one. :waving:
If it's a Canadian bike from new it is in KM. If on the other hand if someone bought it in the US as I did it will be in miles Aspy have a choice of speedos K/M or Miles BUT the odometer on US bikes is in miles. The speedo will tell you; if the speed numbers are in K/m with small miles it is definitley K/m's
With cars, it's kinda easy to tell the difference between 81,000 and 181,000 miles. Look at the carpet in the drivers floorboard, look at the rubber pad on the brake pedal. Those items tend to show lots more wear at 181,000 then 81,000.
Perhaps on a GW you can check things such as the rubber on the topside of the footpegs, shifter, etc, checking compression is one way, although not a surefire way. Some items will just show more wear after 100k more miles. Or Km, but not as much.