减速机的比数有：1：3至1：180比。
马达有圆轴和齿轮轴两种，只有齿轮轴才能够与减速机直结。
中间减速机：当单一的减速机不能得到所需的减速比时，可以加装一个或多个中间减速机，来获取更大的减速比。
可搭配的马达功率有
减速机的外形尺寸
GN/GU都有1：10中间减速机。
齿轮减速机型号：
2GN3K,2GN5K,2GN6K,2GN7.5K,2GN9K,2GN10K,2GN12.5K,2GN15K,2GN18K,2GN20K,2GN25K,2GN30K,2GN36K,2GN40K,2GN50K,2GN60K,2GN75K,2GN90K,2GN100K,2GN120K,2GN150K,2GN180K,2GN10XK
2GN3S,2GN5S,2GN6S,2GN7.5S,2GN9S,2GN10S,2GN12.5S,2GN15S,2GN18S,2GN20S,2GN25S,2GN30S,2GN36S,2GN40S,2GN50S,2GN60S,2GN75S,2GN90S,2GN100S,2GN120S,2GN150S,2GN180S
2GN3L,2GN5L,2GN6L,2GN7.5L,2GN9L,2GN10L,2GN12.5L,2GN15L,2GN18L,2GN20L,2GN25L,2GN30L,2GN36L,2GN40L,2GN50L,2GN60L,2GN75L,2GN90L,2GN100L,2GN120L,2GN150L,2GN180L
