Spoke angle deviation amount measuring system

A spoke angle deviation amount measuring system for measuring a spoke angle deviation amount of a steering wheel when a vehicle is in a straight traveling state, the vehicle having a plurality of tires configured to rotate in a forward rotational direction about a first axis extending in a lateral direction as a center of rotation when the vehicle is traveling forwards and to rotate in a reverse rotational direction about the first axis as a center of rotation when the vehicle is reversing, the spoke angle deviation amount measuring system comprising:

• a plurality of tire support units each having a tire support rotational member provided so as to rotate in the reverse rotational direction and configured to support each of the plurality of tires so as to rotate in the forward rotational direction by rotating in the reverse rotational direction and each configured to turn about a second axis extending in a vertical direction as a center of rotation;
• a turning unit configured to rotate each of the plurality of tires supported by the tire support rotational member in the forward rotational direction with a spoke angle of the steering wheel being zero and the steering wheel staying neutral and in a case where a lateral stress is generated in each of the plurality of tire support units, to turn each of the plurality of tire support units about the second axis as a center of rotation from its initial position according to the generated lateral stress;
• a turning angle detection unit configured to detect a turning angle of each of the plurality of tire support units from its initial position in a case where each of the plurality of tire support units is turned about the second axis as a center of rotation by the turning unit;
• and
• a spoke angle deviation amount calculation unit configured to calculate a spoke angle deviation amount of the steering wheel based on the detected turning angle, detected by the turning angle detection unit.