[rjoconnell]

Note the new series name, a new title sponsor and tyre supplier for Japan's pro-am endurance series founded in 1991.

Class structure remains unchanged for 2018:

ST-X: FIA GT3
ST-TCR: TCR Touring Cars
ST-Z: FIA GT4 (which will have actual participation this year!)
ST-1: Production based cars with 3501cc displacement and above
ST-2: 2001-3500cc, all-wheel drive
ST-3: 2001-3500cc, two-wheel drive
ST-4: 1501-2000cc
ST-5: 1500cc and below

And the schedule will be highlighted by the Fuji Super TEC 24 Hours on June 2-3:

April 1: Suzuka Circuit (4h)
April 29: Sportsland Sugo (3h x 2 groups)
June 2-3: Fuji Super TEC 24h
July 15: Autopolis (5h)
September 23: Twin Ring Motegi (5h)
November 4: Okayama International Circuit (3h x 2 groups)