Left handed thread is usually used for left pedalsand (most modern threaded) right cups of bottom bracket bearings. This is why it is important to know which kind of thread one is dealing with – especially when trying to loosen a tightened screw. □ The screws are screwed in anti-clockwise – “the rule of left thumb”. Threads mentioned in the post about standard bicycle thread dimensionsare all right handed.Īll the same, but reversed. ![]() Right handed thread is the most common, while left handed one is exceptional, used only when necessary. When the right thumb is placed onto the head of the screwed in screw (or the hole a screw will be put into), fingers are pointing the direction for tightening the screw. For easier coping (in case of a tricky position, upside down etc.) there is a simple rule of thumb, shown in the picture 1. Unscrewing is, of course, done in the opposite direction. Right handed thread is made so that bolts and screws are screwed in by turning them clockwise. Right handed thread – “the rule of right thumb” Right handed thread – “the rule of right thumb”ġ.Before explaining the left handed thread, first the right handed one will be explained. This post explains the difference between (a more common) right handed and left handed thread. ![]() Term “left handed thread” is often used in cycling literature and practise.
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