For TDMA cellular systems that introduced multihop transmission. the spectral efficiency and outage probability in a single-cell environment are formulated and evaluated numerically. By using approximations, the numerical evaluation is also conducted in an interference-limited multicell environment and compared to Simulation results. In formulating these performances. the focus is on the common points of multihop transmission and symbol rate control, and a method similar to the performance evaluation method of rate-adaptive TDMA cellular systems is applied. In particular, the opposite effects of multilhop transmission on the spectral efficiency are explicitly considered. In a single cell environment, instead of lowering the spectral efficiency somewhat by the introduction of multihop transmission, the cell coverage satisfying the allowable outage probability could be clearly expanded. A multicell environment could be implemented with cell reuses with a smaller allowable Outage probability resulting from the introduction of multihop transmission. Consequently, an improved spectral efficiency is expected.