Swing speed is a minor consideration of about a dozen things to consider when buying clubs. You're better off either getting fit, or at the least trying out as many as you can at an outdoor range.

Better to get fit…but, it depends if you have a smooth or hard transition to the ball. I am at 78 mph with my 7 iron with a smooth transition because of lower back pain and was fitted into regular nippon 105 in the t100s. You are a tweener IMO pending transition and dispersion. I just replied because I’m in the speed range with the 7 iron. Good luck!!

We on here are Titleist's loyalist and consumers as yourself. In that you know you swing speed, I am guessing that you have been checked on Trackman or something similar. A good fitter should be able to put you in the right club and shaft combination. Whenever I get new clubs, I rely on my fitter who has over thirty years of experience, is not only a Titleist certified fitter but fits for most major manufacturers. At the ripe old age of 75 I know my swing does change as I get older and he has helped me tremendously. And yes, all my clubs are Titleist. Go see a professional like most of us do on this site. With respect. Makes golf so much more fun. =)

More factors than just swing speed should be considered when choosing shaft flex. You should work with a fitter to determine which flex is best for your swing.

So my advice on this one would very much be not to base your shaft flex on your swing speed.

Reason for this is that not all companies build to a ‘standard’ flex for some companies they stiff might be relative to another regular.

Plus a lot of it comes down to feel and how your transition is through the swing.

Best thing to do it go get fit or if you have the facility to, just go and try a load of different shafts and see what you get the best performance and feel out of.

As I know some with a similar swing speed to yourself and plays modus 105 X flex

If only there was an industry standard for flex…but there isn’t. We also each own our own swing. How you load/transition the club impacts as well. A regular shaft too soft will tend to pull or widen the dispersion. A too stiff shaft will tend to fade.

A good fitter can point out quickly which shafts are better for your swing and trialing different flex shafts to get the best for you. Sadly, even within one OEM’s lines, R and S doesn’t translate the same across their products.

But our opinions are free and worth every penny if you rely on us. ‍

Unfortuately there is no standard for flex designation so the correct answer would be shaft specific and this is further complicated by different shaft profiles i.e. shaft frequncies along the length of the shaft. A proper fitting is the safe way to go.

Depends on more than just swing speed, such as shaft brand/model, weight, swing transition, tempo, and other variables.

is your tempo fast or slow? i would try lighter stiff flex options if your tempo is fast and heavier reg flex options if your tempo is slow.