| MOT stations do it slightly different as in they only use one set of scales, these are usually set into the floor so that they are the same height as the floor. Then they wheel the front wheel on take a reading then the rear wheel and take a second reading and them add them together.
When using a single set of scales it is important to have them level with the surface the other wheel is sat on other wise you could be adding a bias to the process, if the scales are set lower then the bike will read over its true weight and if they are set higher it will come in lighter than it really is.
A set of scale under each wheel eliminates this chance of error.
Using two scales dead flat will also give you the weight bias of the bike and if you raise one set a known height above the other the figures can be used to calculate the bikes centre of gravity (CoG)
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