Mizuno’s new ST-230 series of metalwoods introduces a new energy source called the Cortech Chamber.
After multiple iterative developments for stability, sound and spin, Mizuno’s speed technology (ST) project identified “the missing piece” to its ball speed equation with the Cortech Chamber, which encases a stainless-steel weight with elastomeric TPU, taking stress from the clubface and creating an additional source of energy.
At the same time, the ST-230 metalwoods locate weight closer to the clubface to reduce spin rates, while contributing to a more solid, powerful sensation at impact.
“Our player testing over the years shows that placing extra weight close to the face results in faster ball speeds and low spin rates,” said David Llewellyn, director of R&D for Mizuno. “We’ve been steadily working towards the Cortech Chamber, which is incredibly effective at that job. Encasing the steel weight within the TPU Chamber means that we’re moving weight close to the face at the same time as creating an additional source of energy. Steel is twice the density of titanium but won’t weld directly, which is where the TPU has a second role.”
The new Cortech Chamber is featured in three new ST-230 drivers (ST-Z, ST-X and ST-X Pltnm) as well as the ST-Z fairway and hybrid.
The ST-Z 230 ($500) is a straight-bias driver with more stability on off-center hits. The ST-X 230 ($500) has a more rounded, deeper profile with weight closer to the hosel for a higher-spinning, more workable driver with a mild-draw bias. The ST-X Pltnm ($550) is a high-launching, ultra-lightweight draw-biased driver for slower or moderate swing speeds.
The ST-Z 230 fairways and hybrids are mid-low spinning, high launching and adjustable with improved stability. The fairways ($300) are available in 3- and 5-wood, and the 2-5 hybrids ($250) offer lofts of 16, 19, 22 and 25 degrees.
PHOTOS COURTESY MIZUNO