teeth on the front chainring and rear cog maybe very worn thus causing slippage / jumping ? check the allignment of the teeth and how pointy they are the older the teeth the more damaged they will be ( like humans in a way )
@dicki started
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teeth on the front chainring and rear cog maybe very worn thus causing slippage / jumping ? check the allignment of the teeth and how pointy they are
the older the teeth the more damaged they will be ( like humans in a way )