Three new Titleist GTS drivers—GTS2, GTS3 and GTS4—were added to the USGA’s list of conforming driver heads today and were being introduced to tour players on the PGA Tour, LPGA Tour and Korn Ferry Tour this morning.

While the company is not releasing details on the new models currently, the nomenclature seems to follow a familiar cadence. If past models like the most recent GT family is any indication, the GTS2 model will be the larger footprint with a slightly higher emphasis on off-center hit stability, the GTS3 will be the more compact option with a more forward center of gravity than GTS2 and greater adjustability, while the GTS4 will be the most compact, ultra-low spin option with the most forward CG. Titleist normally introduces its drivers on a two-year cycle but the appearance of the GTS family marks the earliest appearance on the conforming list for an entire Titleist driver family since the familiar nomenclature of “2” and “3” model drivers began back in 2010 with the 910 family.

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In viewing photos supplied by the company, there is again a five-position weight track at the front of the sole on GTS3 and, in a change from past similar versions, the track also appears on the sole of GTS4. Titleist’s familiar 16-way adjustable hosel also appears to be again part of the GTS design.

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Titleist is the most played driver on the PGA Tour, and according to the company, Titleist drivers have been the No. 1 driver on the PGA Tour for the last seven seasons. Citing tour equipment research from the Darrell Survey, the company indicated that 40 percent of drivers played on the PGA Tour are Titleist. Appearing on the conforming list today means the drivers are eligible to be used in tour competition beginning Thursday.

More details to come on this latest launch from the tour this week.