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For track (road course) use, you'd be better off in the Star Spec or the Kumho or Bridgestone. Star Spec and Kumho are cheaper. Those tires will handle heat better and stay consistent over 20-30 minute sessions compared to the 615. The RT615 is a better autox tire though b/c it warms up faster and has good grip when colder as compared to the other tires.
In the GRM test, they suspected that the Dunlop would do better if it were the same size as the other tires so don't take the test solely on face value. Read the article and pay attention to the impressions of the drivers as it will give you a better picture of all the tires and you can make a better decision.
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93 Vintage Red R1
Power: Street Ported Motor, 99 Twins, V-mount, DP>SMB cat/MP> RB cat back, PFC, 1300cc secondaries, Fuel Pump, ACT clutch, RB lwfw, etc
Steve Kan tuned - 310rwhp at 10PSI
Suspension: Tripoint custom valved Koni + Ground Control coilovers, Eibach sway bars, SuperPro bushings, Corner Balanced and accurately aligned
Brakes: RacingBrake 4 corner BBK
SSR Integrale 17"x9" +45, Dunlop Star Specs 255/40
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