The minimum stopping distance is achieved when 100% of the braking force is transferred to the front wheel, in which case a rear brake provides zero stopping force and is unnecessary. A rear brake is only necessary in slippery or poor traction conditions, or on extemely heavy bikes descending long or steep hills. On a FG, a rear brake is a detriment in slippery conditions, as better rear braking control can be achieved by backpedalling.