Planetary Gearbox vs. Cycloidal Technology, Cycloidal Speed Reducers Nabtesco's Gearbox Reducers consist of a patented two-stage cycloidal design ... The RV gear utilizes rolling contact elements to reduce wear, extend life and .. Cycloidal gearbox. 1.Large ratio of gear reductions:the ratio is 1/9-1/87 at single stage reduce,1/99-1/7569 at double-stage reduce,1/2057-1/658503 at ..