The designer in industry should be in a position to predetermine by calculation the size and hardness of, and the deflection to be expected from, a rubber spring which is to serve a special purpose. Unfortunately the literature contains little which would be of help; and it is the author’s intention in this paper to supply such information for rubber springs loaded in shear. Most of the designs ordinarily encountered in practice have been considered. The agreement of theory and experiment is shown in all cases where data are available. A chart is given which enables anyone to determine immediately the shear angle expected from a plane shear mounting of any size and rubber hardness within the limits ordinarily used for springs.