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BBTG information?


OrangeGravy

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Is there any resource that lists the bottom bore to ground measurements for irons? Either by the specific manufacturer or some other outside resource? I would guess the only way to know is have a head in hand to measure. I'm a miser always looking for a deal and it really makes buying shaft pulls to test dicey. 

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On 3/3/2021 at 4:31 AM, OrangeGravy said:

Is there any resource that lists the bottom bore to ground measurements for irons? Either by the specific manufacturer or some other outside resource? I would guess the only way to know is have a head in hand to measure. I'm a miser always looking for a deal and it really makes buying shaft pulls to test dicey. 


No such list or DB exist public. I tried to make one here some years back, but the majority of users is only collecting datas here, sharing their own datas seems "impossible" for some reason, and that goes for anything.

Edited by Howard_Jones
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DO NOT SEND PMs WITH CLUB TECH QUESTIONS - USE THE PUBLIC FORUM.

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2 hours ago, Howard_Jones said:


No such list or DB exist public. I tried to make one here some years back, but the majority of users is only collecting datas here, sharing their own datas seems "impossible" for some reason, and that goes for anything.

Is there  a "general" range of measurement typically for most irons these days? For example, most will fall between 1"-1.25"?

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1 hour ago, OrangeGravy said:

Is there  a "general" range of measurement typically for most irons these days? For example, most will fall between 1"-1.25"?


There never was a common standard, but for PLAYERs Irons, we OFTEN see a Hosel Total thats 2.50" split up as 1.25" BBGM and 1.25" as insert.

When we move from players irons into Game improvement, BBGM tends to go up, while a insert of 1.25" is still the most common, no matter BBGM. We often see GI heads with a BBGM of 1.50", some even higher

Wedges (classic blade wedges), ALWAYS have a higher BBGM than irons, and 1 5/8" is about the shortest you will see, some is higher.

Clubs with a LOW BBGM measurement, will have a longer net. cut butt section, and longer net cut shaft and by that higher net cut shaft weight, vs a head with a higher BBGM, and it also make a slight influence on how the same shaft can play in 2 different heads, since we are not using a "identical shaft" when its cut to play length.

In General, a longer butt section = stronger butt CPM and opposite, but exceptions to this exist in models where the butt section is very soft relative to the mid section.

If we for some reason wanted a certain shaft to play identical in 2 heads with different BBGM or INSERT, we will have to to the math so, THE SHAFT ABOVE THE HOSEL, become as identical as possible.

Insert is the simplest to equalize.
If we had 2 heads, the first with 1 BBGM of 1.25 and 1.25" as insert, and the other had 1.25" BBGM but only 1.0" insert (our minimum safe limit, good to know when we need to shim up the tip.), in this case we simply equalize by 0.25" tip trim, EVEN if its a taper tip shaft. This way, WHATS ABOVE the hosel, the only part of the shaft that can flex and bend, is now 100% identical.

It hardly ever is this easy, insert has a "norm" of 1.25" or 32 mm on Japan Made heads, while BBGM is the measurement that vary. That means if we have the same insert, but different BBGM, it becomes the BUTT SECTION ONLY, that becomes "different", and if that matters or not is a question of both the actual shaft model, mow much of a butt section length difference are we talking about, and how sensible is the player?

A shaft like RIFLE FCM that has a relative STRONG BUTT section, "goes stronger as we go longer", and we count 1 CPM stronger for each 1/8" of butt section.

If our heads had a BBGM difference of 2/8", a FCM 6.0 sett will play to FCM 6.0 in the "standard set", and to FCM 6.2 in the set where the butt section is 2/8" longer. On RIFLE FCM its very easy to equalize this, we simply tip trim 2/8" LESS than normal, who make the butt section 100% identical in both heads.

Thats the short version, feel free to ask questions, and il do my best to explain with examples 



 

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Measuring BBTG is easy if you have a club length ruler.  If buying shafts without any specific heads in hand then assuming BBTG of 1" is a safe bet since excessive length can be removed easily.  Just be sure to find out the shaft lengths of the pulls you are considering, and take into account whether there is a grip installed.

 

Edit: and soft stepping 1X is always an option too if the shafts you get are too short.  Most people can't feel such a small difference in flex anyway.

Edited by Nessism
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Ping G425 irons w/Accra ICWT 2.0 95
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Thanks @Howard_Jonesand @Nessism

 

I always look for extra long pulls, but sometimes they aren't out there. The really problem is my patience or lack there of! I SHOULD wait until I have the heads in hand, but I love scouring online for deals. 

 

A better, more specific question, would be do either of you know what the BBTG is for Ping i210, 2013 anser, and s55 irons are? 

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