Rim exchanger, rim holding device, and tire test system

A rim exchanger for exchanging an upper rim and a lower rim each of which has a rim body to fit into a tire and a protrusion portion protruding from the rim body with a rim holding machine holding the upper rim and the lower rim, the rim exchanger comprising:

• a rim stocker that supports the upper rim and the lower rim;
• and
• a stocker moving mechanism that moves the rim stocker between a delivery position where the upper rim and the lower rim can be delivered to and from the rim holding machine and a retreat position away from the rim holding machine,
• wherein the rim stocker includes an upper and lower rim support section having an upper rim support portion that supports the upper rim, a lower rim support portion that supports the lower rim, and a connection portion that connects the upper rim support portion and the lower rim support portion to each other, and
• wherein both the upper rim support portion and the lower rim support portion have a pair of support arms separated from each other in a horizontal direction, a portion between a tip of one of the support arms and a tip of the other of the support arms forms an open end where the rim body enters a portion between the pair of support arms, and each upper surface of the pair of support arms forms a protrusion portion support surface which supports the protrusion portion from below.