Originally Posted by
Andy_K
I weigh my bikes on a scale very similar to that. It was sold on eBay as a fish scale. I don't have a good way to hang it, so I typically just hold it and lift the bike with the hook. It doesn't stabilize to a single number that way, but I can usually figure out about more or less what it's telling me, probably within the accuracy of the scale. In addition to pounds, ounces, and kilograms, mine will tell me the weight of things in Jin. I haven't had a use for that, but I could do it if I did. Also, the ghost of my freshman college physics professor insists on reminding me that kilograms are a measure of mass, not weight.
I don't see the problem. Stygg's scale says 12.18, and it is reasonable to assume it is indicating kilograms. The conversion factor for kilograms (mass) to pounds (force) is 2.2 kg per pound. The calculation of that factor includes the conversion from mass to force. The necessary factor is the acceleration due to gravity, which is usually considered a standard value. Multiply 2.2 times 12.18. So the resulting weight of Stygg's mountain bike is 26.8 pounds, which is certainly plausible for a mountain bike.
Again, I don't see a problem. It seems to be a 27# bicycle.
What kind of errors are we worried about, and are they large enough to challenge this answer for any practical purpose?