Mizuno JPX921 Irons Review
Watch Joel Tadman test all four Mizuno JPX921 irons on the golf course
You can read about the advances in technology and design here over the JPX919 irons but in the JPX921 irons, Mizuno has essentially created a range that caters for every ability of golfer. It claims the JPX921 Forged model will provide the most significant gains over the previous JPX919 model. We were lucky enough to be one of the first to give them a thorough test at Burghley Park Golf Club.
Changes in the design of each of the irons means Mizuno has made adjustments to the lofts. The Forged, Hot Metal and Hot Metal Pro are all one degree stronger in the 4-8 irons while the Tour model remains unchanged at 34° in the 7-iron. We tested all four irons on the Flightscope X3 launch monitor in the same Dynamic Gold 120 x100 shafts we tested the JPX919 models in.
Looks wise, there isn’t a huge departure from the prior generation. There’s more black paint fill on the back, which we think adds to the shelf appeal and the overall aesthetics are consistent across all four irons. The Tour model has a lighter finish than the old version and the Forged iron has been made more compact with a thinner topline than the JPX919 version, making it look more like the Tour than the Hot Metal Pro. As such it made it into our guide on the best compact mid-handicap irons (opens in new tab).
From left-to-right, the Mizuno JPX921 Tour, Forged, Hot Metal Pro and Hot Metal irons
In all honesty, from the address view it was difficult to tell which was the Hot Metal and the Hot Metal Pro. We expected the Hot Metal Pro to be noticeably more compact, especially given the more refined look of the Forged iron. Performance wise, the launch monitor threw up a few surprises. The first being that the Hot Metal Pro gave us the fastest ball speeds and highest flight while the new Forged model actually spun the least.
We didn’t see as big a jump in ball speed and distance either from the old Forged model to the JPX921 Forged version. That said, the new model did launch higher despite being one-degree stronger in loft and provided 500 rpm less spin, which is no bad thing given these irons generally are quite high-spinning considering the lofts. We saw a nice progression in performance moving from the JPX900 Hot Metal through the JPX919 and then a bigger jump into the JPX921 version, although the lofts are getting stronger by one degree each time.
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