Abstract: A vehicle management method includes assembling a vehicle body of a vehicle and a power source to be mounted on the vehicle, acquiring, at a first time, first gear-ratio-related information which is information related to a gear ratio of a transmission section, the transmission section being a whole or part of a power transmission mechanism between the power source and a wheel of the vehicle, storing the first gear-ratio-related information in a storage unit mounted on the vehicle or a storage unit of an external device provided to be capable of communication with the vehicle, acquiring, at a second time after the first time, second gear-ratio-related information which is information related to the gear ratio of the transmission section, and comparing the first gear-ratio-related information stored in the storage unit with the second gear-ratio-related information.

Abstract: An electric bicycle includes: a sleeve to which power for driving the electric bicycle is input; a rear wheel; and a power transmission mechanism that transmits the power input to the sleeve to the rear wheel. The electric bicycle determines an abnormality of the power transmission mechanism or prevents or prohibits driving performed by using the power transmission mechanism based on a reference composite gear ratio of the power transmission mechanism acquired at a first time and current composite gear ratio of the power transmission mechanism acquired at a second time subsequent to the first time.

Abstract: An electric bicycle includes: a sleeve to which power for driving the electric bicycle is input; a rear wheel; and a power transmission mechanism that transmits the power input to the sleeve to the rear wheel. The electric bicycle determines an abnormality of the power transmission mechanism or prevents or prohibits driving performed by using the power transmission mechanism based on a reference composite gear ratio of the power transmission mechanism acquired at a first time and current composite gear ratio of the power transmission mechanism acquired at a second time subsequent to the first time.

Abstract: An electric connection box includes a base having a relay mounting portion on which a relay is configured to be mounted. The base has a component mounting portion on which a component is configured to be mounted at a lower position of the relay mounted on the relay mounting portion. The component mounting portion is disposed so that at least a part of the component mounting portion overlaps with an area of the base in which the relay is mounted in a plan view.

Abstract: An electric connection box includes a first base on which an electronic component is configured to be mounted, the first base having a first side surface portion and a second side surface portion, and a second base on which the electronic component is configured to be mounted, the second base configured to be assembled to the first base and having a first side surface portion and a second side surface portion. The first side surface portion of the first base faces the second side surface portion of the first base. The first side surface portion of the second base faces the second side surface portion of the second base. The first side surface portion of the first base has a guide rib. The first side surface portion of the second base has a guide groove.