A gearbox comprising: a reference member , a front carrier , a rear carrier , and one or more offset members ; the reference member comprises a central axis , a front carrier axis , and a rear carrier axis ; the front carrier comprises one front central axis and a number of front offset axes equal to the number of offset members ; the rear carrier comprises one rear central axis and a number of rear offset axes equal to the number of offset members ; each offset member comprises a front member axis and a rear member axis ; and wherein: all axes are parallel; the front carrier axis and rear carrier axis are spaced apart by a carrier distance ; each front offset axis and the front central axis are spaced apart by an offset distance ; each rear offset axis and the rear central axis are spaced apart by the offset distance ; all front offset axes are arranged circumferentially around the front central axis ; all rear offset axes are arranged circumferentially around the rear central axis ; each associated front member axis and rear member axis is spaced apart by the carrier distance ; the front central axis is co-axial and rotatably coupled to the front carrier axis ; the rear central axis is co-axial and rotatably coupled to the rear carrier axis ; each front member axis is co-axial and rotatably coupled to a different front offset axis ; and each rear member axis is co-axial and rotatably coupled to a different rear offset axis . a reference member , a front carrier , a rear carrier , and one or more offset members ; the reference member comprises a central axis , a front carrier axis , and a rear carrier axis ; the front carrier comprises one front central axis and a number of front offset axes equal to the number of offset members ; the rear carrier comprises one rear central axis and a number of rear offset axes equal to the number of offset members ; each offset member comprises a front member axis and a rear member axis ; and wherein: all axes are parallel; the front carrier axis and rear carrier axis are spaced apart by a carrier distance ; each front offset axis and the front central axis are spaced apart by an offset distance ; each rear offset axis and the rear central axis are spaced apart by the offset distance ; all front offset axes are arranged circumferentially around the front central axis ; all rear offset axes are arranged circumferentially around the rear central axis ; each associated front member axis and rear member axis is spaced apart by the carrier distance ; the front central axis is co-axial and rotatably coupled to the front carrier axis ; the rear central axis is co-axial and rotatably coupled to the rear carrier axis ; each front member axis is co-axial and rotatably coupled to a different front offset axis ; and each rear member axis is co-axial and rotatably coupled to a different rear offset axis . all axes are parallel; the front carrier axis and rear carrier axis are spaced apart by a carrier distance ; each front offset axis and the front central axis are spaced apart by an offset distance ; each rear offset axis and the rear central axis are spaced apart by the offset distance ; all front offset axes are arranged circumferentially around the front central axis ; all rear offset axes are arranged circumferentially around the rear central axis ; each associated front member axis and rear member axis is spaced apart by the carrier distance ; the front central axis is co-axial and rotatably coupled to the front carrier axis ; the rear central axis is co-axial and rotatably coupled to the rear carrier axis ; each front member axis is co-axial and rotatably coupled to a different front offset axis ; and each rear member axis is co-axial and rotatably coupled to a different rear offset axis . <EOS>