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: A straddle type vehicle may be provided with a side bag support member in which a horizontal wall part is extended inward in the vehicle width direction from a vertical wall part fixed to a portion of a side bag on the inside in the vehicle width direction to an area below a lower surface part of a rear side cover, and the horizontal wall part is fixed from below to a side bag support part on a lower surface side of a seat frame.

Abstract: A straddle type vehicle may be provided with a side bag support member in which a horizontal wall part is extended inward in the vehicle width direction from a vertical wall part fixed to a portion of a side bag on the inside in the vehicle width direction to an area below a lower surface part of a rear side cover, and the horizontal wall part is fixed from below to a side bag support part on a lower surface side of a seat frame.