In 1985, Industrial Property Rights Ltd, (run by James Marshall, former manager of golfer Greg Norman) licensed the design.
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Series 5 and Series 4 (Mini) machines have a freewheel mounted in the conventional position on the rear wheel (In Series 3 the freewheel, a commonly available Shimano 18t model, is part of the metal and plastic bottom bracket/crankset assembly) and a metal bottom bracket shell which incorporates an eccentric housing to adjust belt tension.