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Is the headlight beam height at 3m measured with or without rider? as sitting on a bike changes its geometry, also a heavier rider will change the geometry more. My bike nearly failed a wof because the beam was high - but this was the first time in 17 years my headlight beam height had been called into question and the examiner was probably 1/2 my weight.

Hi there,
The light dip angle would be taken without a rider as the settings are not judged by the bike height. It's a percentage of dip based on the light height and so if you measure the height without the rider- the dip percentage would be determined without the rider and vice versa.
Here is the link and if you open the 'Table and Images' folder you can see how it is tested. https://vehicleinspection.nzta.govt.nz/virms/in-service-wof-and-cof/motorcycles/lighting/headlamps