Originally Posted by Choccy
That trick with the scales does not work as you muscles will take some of the weight. It needs to be dead weight to weigh it properly. Try a band round the rear brake lever and balance the bike on it's back wheel on the scales. I tried the scales trick before but got about 2lb differences when I used hanging scales.
The 2lb difference between the bathroom scale and a hanging scale is due to the inaccuracy of the bathroom scale. Standing on the scale platform in a different spot will affect the reading. Positioning the scale on a different part of the floor will affect the reading. Leaning forward and backward will affect the reading.
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