Once any initial cable stretch has been taken care of, hub gears should seldom need adjustment. However, if you notice any slipping or other odd effects when pedaling, deal with problems as soon as possible to avoid permanent damage. Usually, the problem will be caused by poor adjustment, but it could also be caused by a stiff cable run or damage to the indicator chain which goes into the rear axle.
If you cannot resolve the issue quickly, avoid hard pedaling in the gear in question and take your Brompton to your authorised dealer.
Les engrenages du moyeu doivent-ils être ajustés ?
Moet een naafversnelling worden afgesteld?
Müssen die Zahnräder des Nabengetriebes eingestellt werden?
Gli ingranaggi del mozzo devono essere regolati?
¿Necesitan ajustarse los cambios internos?