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Rim Hole Sizes for Agriculture Rims

There are two different sizes of valve stem holes for standard agricultural rims.

The small hole is .453" or 29/64" (TR-13 valve stem).

The large hole is .625" or 5/8" (TR-15 or TR-218A valve stem).
In some agricultural applications, the rim has a large hole (TR-15 or TR-218A) and the only inner tube available has a small valve stem (TR-13). The small valve stem on the inner tube will fit into the large hole, leaving about 1/16" between it and the hole. To prolong the life of the inner tube, a valve hole bushing can be installed over the small valve stem. The bushing is slid over the small valve stem, filling the gap between it and the large hole in the rim. With the bushing installed, the small valve stem will be held securely in the large hole.