Abstract: An information processing method according to an aspect of the present disclosure includes: acquiring first information indicating an initial value of one or more items; executing a first simulation using the first information to identify second information including information indicating a first location where an accident involving the one or more mobile bodies can occur and information regarding a mobile body and a person present in surroundings of the first location; calculating, based on the first information, third information that is an indicator of usability of the service and fourth information that is an indicator of economic performance of the service; calculating, based on the second information, fifth information indicating an amount of damage caused in case of the accident; and retrieving, using the third information, the fourth information, and the fifth information, an optimal solution for the one or more items under a predetermined condition.

Abstract: A bicycle derailleur includes a derailleur body, a pivot axle and a chain guide. The pivot axle has a retaining end pivotally retained to the derailleur body and a chain guide supporting end. The chain guide includes a first plate, a second plate and a guide pulley. The first plate is fixedly mounted on the pivot axle to rotate therewith. The second plate is mounted on the pivot axle at location farther from the derailleur body than the first plate. The guide pulley is rotatably mounted on the pivot axle between the first and second plates.