There is no exact science, the flex of shaft you need corresponds to your swing speed. The faster your swing the stiffer the flex you will need. The only way of really knowing for definite is to get on a launch monitor and try a variety of shafts in a variety of flexes, all manufacturers will have a different standard for how they define each flex, so just because you are a stiff in a Diamana doesn't necessarily mean you will be a stiff in an Aldila. Also, shafts come in a variety of weighs, a heavier shaft will play ever so slightly stiffer than a lighter one.
One simple way of giving you an idea of if a shaft is right for you is analysing your shot patterns. If you constantly hook the ball then the shaft could be too flexible, i.e you need a stiffer shaft, if you constantly slice the ball, the shaft could be too stiff and you need a more flexible shaft, i.e a regular shaft.
Graphite shafts also different tips on them, a soft tip helps promote of higher launch angle, where a stiffer tip promotes a lower one.
Very simple stuff I know, but all shafts stick to the same sort of ideas, on a shaft you will see; manufacturer, model, flex, weight and tip flex, these all help you see what sort of shaft it is. I would recommend if you are a beginner to use regular shafts to start with and see how you get on. I do highly recommend that all golfers if getting new clubs hit as many as possible trying as many different lofts and flexes as they want, custom fitting is usually free and the shops are more than happy to help.
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