I snapped off the graphite shaft in my Great Big Bertha Iron. I want to move to a steal shaft that is light. I choose the Nippon Zelos 7 iron shaft but don’t know if I am supposed to purchase the 370 or 355? Could someone help as I cannot find information on whether the 2023 Great Big Bertha uses 370/355?
I looked at the chart but the list stops at 2021 for Callaway and this is the newest model :(
It looks like I was wrong when I guessed it had to be a .370 tip. It’s a .355 after all:.
Callaway shows three shaft options here: https://www.callawaygolf.com/golf-clubs/iron-sets/irons-2023-gbb.html
and a search on that shaft name–the steel version–lead me here:
https://nipponshaft.com/product/steel_850gh_neo.php
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Those specs show the tip diameter to be 9.02, which is, of course, millimeters.
The conversion factor I always use is 25.4mm=1 inch. So 9.02mm/25.4=.355
(or .3551181, as far as this calculator goes).
I see it as a fairway wood that looks like an iron. As I said before, I conjured up a version of this many years ago now using a #1 iron and a graphite wood shaft…so I get the basic idea and have some experience with it too.
Don’t recall ever hitting it off a fairway however. Your results may vary with that GBBI, of course.
Looking at the Maltby chart I would assume it’s .370″
Most of their current irons are .370 with exception of the “pro’s”.
See link:
https://www.golfworks.com/oem-golf-shaft-replacement-guides/