A wear computing system and a wheel of a vehicle , wherein the wear computing system is for computing wear of the wheel of the vehicle , the wheel including a main wheel , the main wheel including an annular member having a laterally extending central axial line (Y1), and a plurality of driven rollers rotatably supported by the annular member around tangential lines of the annular member at respective positions of the driven rollers , and a pair of drive disks , each drive disk including a hub supported by a vehicle body of the vehicle on a corresponding side of the main wheel so as to be rotatable around a rotational center line substantially coaxial with the central axial line (Y1) of the annular member , and a plurality of drive rollers circumferentially positioned thereon so as to be rotatable around a rotational center line in a skewed relationship to the rotational center line of the hub and in engagement with the driven rollers , comprising: a revolution sensor configured to detect a number of revolutions of the wheel ; an acceleration sensor configured to detect an acceleration of the vehicle in a travel direction thereof; and a control unit configured to compute a travel distance of the vehicle from the acceleration of the vehicle, and compute the wear from the travel distance and the number of revolutions of the wheel, wherein the revolution sensor is configured to detect a revolution number of the main wheel , and a revolution number of the driven rollers , the acceleration sensor is configured to detect a fore and aft acceleration and a lateral acceleration of the vehicle , and the control unit is configured to compute a fore and aft travel distance from the fore and aft acceleration, a second wear from the fore and aft travel distance and the revolution number of the main wheel , a lateral travel distance from the lateral acceleration, a third wear from the lateral travel distance and the revolution number of the driven rollers , and a first wear from the second wear and the third wear, the first wear being the wear of the wheel. a revolution sensor configured to detect a number of revolutions of the wheel ; an acceleration sensor configured to detect an acceleration of the vehicle in a travel direction thereof; and a control unit configured to compute a travel distance of the vehicle from the acceleration of the vehicle, and compute the wear from the travel distance and the number of revolutions of the wheel, wherein the revolution sensor is configured to detect a revolution number of the main wheel , and a revolution number of the driven rollers , the acceleration sensor is configured to detect a fore and aft acceleration and a lateral acceleration of the vehicle , and the control unit is configured to compute a fore and aft travel distance from the fore and aft acceleration, a second wear from the fore and aft travel distance and the revolution number of the main wheel , a lateral travel distance from the lateral acceleration, a third wear from the lateral travel distance and the revolution number of the driven rollers , and a first wear from the second wear and the third wear, the first wear being the wear of the wheel. <EOS>