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  1. F

    TSDz2 brass gear whining

    I worked at a gear manufacturing company. I took a course on detailed gear design. Noise was one of the topics. We didn't study it in depth, but I remember several factors that influence noise. They are ratio, pitch, and face contact ratio. Really high ratios (as found in the TSDZ2) are bad...
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    Winter problem with Tongsheng TSDZ2

    If it feels like a bad gear shift while pedaling (I remember it felt like someone was hammering my bicycle frame from underneath the bottom bracket), it is probably the blue gear that is failing. If it feels like your pedals are slipping and not really supplying torque to the chain, then it's...
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