Amaketango angu-20A-1/20B-1 womabili awuhlobo lweketango le-roller, futhi ahluke kakhulu ngezilinganiso ezithe ukuhluka kancane.Phakathi kwabo, i-pitch ebizwa ngokuthi i-chain 20A-1 ingu-25.4 mm, ububanzi be-shaft buyi-7.95 mm, ububanzi bangaphakathi buyi-7.92 mm, futhi ububanzi bangaphandle buyi-15.88 mm;ngenkathi iphimbo elijwayelekile...
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