Abstract: A split wheel assembler/disassembler tool having a base plate, a plurality of outstanding elements for engaging and preventing the rotation of wheel fastening bolts and a tire compressor. During the assembly procedure, the outstanding elements prevent the fastening bolts from rotating while a tire mounted upon a wheel subassembly is compressed sufficiently to enable the fastening bolts to protrude through openings in a demountable flange utilized in conjunction with the wheel subassembly. Thereafter, nuts can be applied to the bolts and torqued with a desired force thereby securely positioning the demountable flange against the wheel subassembly. During disassembly, the tool aids in securely positioning the wheel fastening bolts while the nuts are removed.