Speed Resducer is manufactured in eight gear case sizes, designated by the letters B through to J. The eight sizes may have anyone of three nominal gear ratios, 5:1, 13:1 and 20:1. A very wide chice of final driven speed can be determined by the use of an appropriate input V-Belt drive. The units will normally be oil lubricated, but they are equally suitable for “lubricated for life” greases.