ST200G

Reviewer testing measured MOI at ~4,500 in the highest-MOI (weights-rear) setting and slightly above 4,000 with weights forward. With both weights in the extreme rear position, the chassis approaches the standard sibling's MOI; with weights forward, spin drops substantially but MOI trims to 4,000. Tour-leaning compact-feeling head with single 9° loft trades pure forgiveness for tour-spec workability. Mid-tier 2020 forgiveness with meaningful variance based on weight position.

Independent commentary called the chassis "the most-adjustable, lowest-spinning driver Mizuno has ever produced," with 500rpm spin separation between front and back weight positions (vs the predecessor's 300rpm range). Reviewer launch monitor testing measured 2mph ball speed gain at 102mph swing speeds, with tee shots finishing 250yd+ and outperforming category benchmarks of the era. Top-tier 2020 tour distance.

Best-in-family adjustability. Fast Track system delivers two 7g sliding weights on dual sole tracks — 14g of movable mass for spin/draw/fade tuning. Reviewer testing measured ~20ft shot-height drop with weights forward and ~11yd draw bias with weights back. Single 9° loft head with hosel ±2° adjustments produces a 7-11° loft range. Tour-staff-validated workability platform via design contributions from multiple PGA Tour players.

Reviewer testing called the head "a little hotter coming off the face" than the standard sibling. The Beta Ti face plus lighter sole and carbon crown produce premium tactile response at centre. Broader feel review tracks with the standard sibling — capable but lacking the signature dense-solid signature of later refined generations. Mid-tier feel for the 2020 era.

Acoustic profile reads as a little tinny — engineers worked hard for a tour-preferred acoustic. An external sound rib between the weight track and WAVE channel tunes the impact — without it, the forward-weight position would be too loud and clanky. The external sound rib was a deliberate engineering choice to balance the weight-system acoustic. Acceptable but inconsistent — predecessor of later refined acoustic work.

Address profile reads as a tour-leaning compact-feeling 460cc footprint with visible Fast Track sliding weight system and dual sole tracks — a purposeful, tour-spec aesthetic. Lighter carbon-fibre crown plus compact WAVE sole structure clean up the silhouette. Better-player-leaning silhouette appropriate for the 9°-only fitting window.