fred wrote:
For various reasons I wish to run a thinnish pull cord via 4-5 pulley
wheels. Does anyone know if smaller pulley wheels offer more resistance than big ones?


If you imagine reducing your pulley diameter to zero, then it becomes
obvious that smaller pulleys will offer more resistance. There will be
fairly rapidly diminishing returns for enlarging them beyond a certain
point though.

Tim

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Please don't feed the trolls