Quote:
Originally Posted by MLR
I believe you cannot weigh the front then the back and add them up, even on a level plain.
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Of course you can. When the motorcycle is sitting on the garage floor, its weight is split between its two wheels in some way, assuming it's balanced on the two wheels only. If one wheel were sitting on a piece of the floor that were actually a scale, but disguised, it would read the weight on that wheel. If the other one were on a similar scale, either at the same time or not, it would read the weight on that wheel. If you add the two, you get the total motorcycle weight.
Obviously if something else is touching the floor, like a side stand, its force would also have to be measured and added to the total. You can check this by standing on two bathroom scales, one foot on each. The total will be the same, within scale accuracy, as putting both feet on one of them.