The two major improvements to the JPX 919 Tour is the forging process and the length of the club head. The head is still forged but Mizuno has used their high Density or HD forging using 1025 Elite Steel. For the first time in the JPX Family, Mizuno is using the same 1025 E Steel found in their MP Family. They say the forging process squeezes grain structure more closely together and lower in the blade which improves feel and feedback. This packs the grain more tightly in the steel for better feel and certainly, the JPX 919 irons were more solid and better feeling than the 900’s. As before, the JPX 919 is not up to the MP feel levels yet because of the larger head that is now 10% longer than the JPX 900 tour but we believe that it will soon feel more similar to the MP n the years to come.
The cavity back has also been modified with what Mizuno is calling a stability frame. This saves weight from the heel/hosel area of the club and moves it to the toe to increase the MOI. This moves the CG 1.2mm closer to the center of the club, which is quite a lot in iron terms and is one of the factors that help with better feel Mizuno was going for. There is a new “Open Heel” design, which frees up 5g, which is repositioned in the club’s stability frame, improving forgiveness and 10% thinner to edge. In the tour the hidden Stability frame moves the CG to the center of the face making it easier to shape shots, also lowers the CG in the mid and long irons, producing higher ball flight.The JPX 919 tour promises tour caliber performance with precision distance control.
We recently conducted some testing on the Mizuno JPX 919 Tour. One of our Certified Custom Fitters compared the JPX 919 Tour to the JPX 900 Tour iron. They were both 7 irons with standard lie and loft. He used a Project X LZ 125g shaft in both irons. Here are the results: