Bridgestone – Bridgestone Battlax Racing & Competition, including Racing Street RS10F and RS10R fitments, RS11F and RS11R sizes, 120/70ZR17 fronts and wide 180/55ZR17, 190/50ZR17 and 200/55ZR17 rears, is the sharp end of the Battlax range. These are the tires built for riders who measure progress in lap times. Bridgestone develops them alongside its racing programs, and the technology transfer is obvious in the stiff crown construction, the multi-compound tread that keeps the shoulders soft while the center stays durable, and a profile that makes the bike turn in fast and hold a tight line. Rapid warmup and stable feedback at full lean let a rider commit earlier on the brakes and get on the throttle sooner off the apex. The RS10 is the proven track day and fast street choice, while the RS11 refines feel and stability for higher-horsepower machines. Smaller 110/70R17 front and 140/70R17 and 150/60R17 rear sizes cover lightweight supersport chassis too. Track riders should still respect a proper warmup lap and correct hot pressures, because even the best race compound needs heat to reach its full potential.