I liked the looks of the heads right away, so I ordered the pitching wedge, 9 & 8 iron heads, ones that I happen to use most frequently as well as KBS Tour 105 regular shafts. The shafts were tipped as per the chart and butt trimmed to the standard playing length. I dry fitted them together and taped on a Golf Pride Tour Velvet midsize grip and put them on the swing weight machine. I was surprised at the outcome. The 8 iron came out as a C6, the 9 iron a C8 and the PW a D0. A pretty large discrepancy in my view for a purportedly top quality iron head. I play D2 irons, so the 8 iron requires 12 grams of weight which I think is a lot. The other 2 not so much but certainly more than I would have anticipated. Has anyone else experienced this with the new TS-1 heads? Your thoughts and comments would be appreciated.
Our tolerances are +- 2 grams. If the #8 iron was on the light side of the tolerance, that would be 1 swingweight, The grip being 4 grams off the base standard of 50 grams would be anther swingweight point. 9 grams of shaft weight is generally equal to 1 swingweight point. the 105 shaft weight could possibly contribute to 2 more swingweight points. Finally, if the length is 1/4 inch off, that could be another 1.5 swingweight points. So a lot of things can cause the swingweight to be off a little requiring the assembler to adjust. I have not heard of any out of tolerance weight issues and i just checked a box of 8 irons and all were in tolerance. Doesn’t mean you may have received one that wasn’t, but it wold be unusual. As Michael stated, 12 grams is acceptable, but is about the most you would want to add. If any of the head weights are out of tolerance, please contact us so we can address it with our manufacturer. We can replace the one’s you have. Also understand that grips and shafts have weight tolerances too and may not be exactly what is listed.
Several factors affect swingweight, including club length, shaft weight and profile, and grip weight. Of course the clubhead weight may also be off from what it was designed to be. The TS-1 8 iron should be 273 grams, the 9, 280, and the PW, 287. Heads are usually marked with the weight on the wrapper. They may have been off by a few grams. In your case, the KBS Tour 105 Shafts in regular flex are 105 grams, a lightweight shaft that is about 20-25 grams lighter than the standard steel shaft by KBS or True Temper. This alone will make the swingweight much lighter. The midsize grip is 4 grams heavier than the standard and affects SW by about 1 point. Club length is a huge factor since for every 1/2 inch, swingweight is changed by 3 points. Typically, those who play lighter shafts also swing a lighter swingweight. 12 grams may seem like a lot, but it’s not that unusual to add a tip weight of that amount to achieve the desired swingweight. And again, in your case you have at least 2 factors contributing to the lighter swingweights. Hope this helps! Michael