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Everything you need to know about the transmission ratio, also called the reduction ratio (wrongly). You will discover the complete formula with the efficiency, the complete explanation of this formula, the explanation of the reduction ratio and the multiplication ratio, as well as the problem encountered on the software. The formula is to be reversed! In short, it is complete, fast, efficient. 00:00 Transmission / reduction ratio confusion 00:54 Transmission ratio formula 02:12 Definition with speeds 02:55 Torque ratio C 04:22 Diameter ratio D 05:59 Tooth number ratio Z 06:54 Reduction and multiplication ratio 07:22 The English are doing it again (again...) 08:34 End