型号/二级齿轮/小齿轮/齿轮比
A : M0.4x60T M0.4*28T 60T/28T=2.14
B : M0.4x62T M0.4*26T 62T/26T=2.38
C : M0.4x64T M0.4*24T 64T/24T=2.67
D : M0.4x66T M0.4*22T 66T/22T=3.00
E : M0.4x68T M0.4*20T 68T/20T=3.40
F : M0.4x70T M0.4*18T 70T/18T=3.90
G : M0.4x72T M0.4*16T 72T/16T=4.50
H : M0.4x74T M0.4*14T 74T/14T=5.28
I : M0.4x76T M0.4*12T 76T/12T=6.30
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