Endo Manufacturing has been forging clubheads in Japan since 1950, and its client list reads like a museum wing: Titleist, Nike, Bridgestone, the Spalding-era Ben Hogan, plus its own house brand Epon. Srixon has used Endo since the day it started building irons and has spent that entire time declining to mention it. That changed with the 2027 ZXi launch, where the Endo connection is no longer a forum footnote but a headline feature.
The line itself is three new irons plus a utility. The ZXi7 and ZXi5 get updates, the new ZXi5+ slots in above them as a genuine player's distance iron, and the ZXiU utility carries over the same construction. All three iron models are $1,499.99 for a seven-piece steel set, with a $100 upcharge for graphite on the ZXi5 and ZXi5+. The ZXiU is $259.99 each. Pre-sale with free personalization opens now and runs to Oct. 16, which is also when the full line hits retail.
The Endo reveal is the interesting part, because it is a competitive move and not a product one. Mizuno has spent thirty years turning a manufacturing process into an identity. Grain Flow Forged is a stamp on a hosel that functions as a religious credential, and it has been worth more to Mizuno than any single iron model. Srixon's counter is i-Forged condensed forging, where shaped protrusions are hammer-pressed into specific zones to densify the grain structure, allowing the use of softer S15C carbon steel without giving up durability. The engineering is real. The point of naming Endo out loud is that the engineering has always been real and nobody outside the gear-obsessive minority knew where it came from.
The scoreboard supports the frustration. The Srixon ZX5 Mk II won back-to-back MyGolfSpy player's distance titles in 2023 and 2024. The ZXi5 tied for third in 2025 and tied for fourth this year. Mizuno has the aura, Srixon has the test results, and the gap between those two things is a marketing problem, not a metallurgy problem. Putting a 75-year-old foundry's name on the story is the cheapest available fix.
The second signal is the calendar. Cleveland, Srixon's corporate sibling, announced the RTZ2 wedges in early August and had them on shelves last week. The irons land Oct. 16. Metalwoods are queued behind them. January launch season, which Srixon observed dutifully for a decade, is being abandoned in favor of a fall cadence, and the business logic is not subtle. January means fighting TaylorMade, Callaway, Titleist and Ping for the same oxygen in the same two weeks. October means holiday retail, off-season fitting appointments and green grass pre-book conversations happening before the competition has anything to show. Titleist has run a two-year odd-year cadence for a reason. Srixon is now running an eleven-week rolling one.
The ZXi5+ deserves its own attention. At a 77 mph swing speed, early numbers show ball speeds around 114 mph, a 1.48 smash factor, 168 yards of carry and spin just under 4,100 rpm from a 29.5-degree 7-iron with an 81-foot peak height and 43-degree descent angle. Getting that flight profile from that loft is unusual. It also quietly reclassifies the ZXi5 as a player's performance iron, a category that did not have a name eighteen months ago, and leaves the ZXi4 conspicuously absent from the release. Srixon now offers six full iron sets, seven if you count the ZXi4 still sitting in inventory. That is a lot of shelf for one badge.
Srixon sits 13th of 215 on the DORMIED Index and has been flat month over month, which is the profile of a brand whose products outperform its brand equity. Naming Endo is an admission that the second number is the one that needs work. Watch whether the metalwoods launch leans on the same Japanese manufacturing narrative or reverts to speed claims. If it is the former, this is a repositioning. If it is the latter, it was a press release.
