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Shaft Flex for U510

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I'm looking at buying a U510. The stock shaft is a HZRDUS Black Smoke, which uses numerical shaft flex designations instead of the traditional "senior, regular, stiff, extra-stiff" categories. How do those numbers relate to those traditional designations?  I'm assuming 6.0 is stiffer than 5.0, for example, but is 6.0 firmly within the "stiff" category, or is it more of a cross between a regular and a stiff? I use regular shafts on my other clubs, but within the "regular" category, I'm closer to stiff than I am to senior.   Any advice on whether I'm a 5.0 or a 6.0? Thanks.

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It’s not an exact scene because we are all different and one companies stiff is another’s regular but my understand is that that roughly the numbers correspond as follows:-

5.0 - Regular

5.5 - Regular Plus

6.0 - Stiff

6.5 - Stiff Plus

7.0 - Extra Stiff

It would think that the 5.5 option would be the starting point for yourself giving it a try but as ever, there is no substitute to getting out there and trying before you buy if you can.

Titleist TS3 8.5 Even Flow White T1100 6.0
Titleist 915Fd 15 Stiff Rogue Black 
Titleist 712U 3 Iron Stiff Tour AD DI
Titleist T100 4-PW 6.0 Project X LZ
Titleist Vokey SM6 50.08
Titlesist Vokey SM7 56.12 & 60.04
Scotty Cameron Futura 5S
ProV1x 2019



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Thanks for the responses. I was recently fitted for a new set of irons (Mizuno Hot Metal Pros). The fitter had me hit a number of shafts and settled on the Dynamic Gold R300, 101g. He said the Modus stiff shafts were not a bad option for me, but thought the regular flex DG's were a little better choice. So would that put me more in the 5.0 or the 6.0 for the HRZDUS Black Smoke shafts for the U510? I notice the first response mentioned a 5.5 shaft, but I don't see that listed on the Titleist site as an option.

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These are the DG 105? Just reading the descriptions, I would think these shafts are fairly soft vs. the HZRDUS Black Smoke (not rebar but stronger than average). When I mentioned DG, I was thinking about the original DG which are ~127g for R300 (much stronger/heavier than the R300 for DG 105). You won't know until you try the club but I would probably favor the 5.0 version (and I would be happy to play the DG 105s in R300).

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Depends on your swing tempo, static weight, shaft profile preference and how much movement you have in your swing.

My personal rating is 5.3 as R300 regular and 5.8 as S300 stiff.

I have played 5.5 and 6.0 in the past, 6.0 works better for dispersion pattern in my case. For example, 6.0 LZ is just right (5.5 being soft) but 6.0 Rifles is just within my grasp; neither feels boardy.

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