Been running these on my street bike (BMW S1000R). 3-4 track days and some road/canyon/mountain riding. Good grip. Warns up quick. Good for intermediate track day pace. Gotten it to the edge a lot and knee dragging and it is solid. Turn in seems a little slower then a Dunlop Q3, but very neutral at the limit. I am happy with this as a cheap street/track day tire. Grip is probably as good as my race tires were 10-15 years ago. I only get 1000 miles or so out of the rear, but my track is very abrasive.
Bridgestone Battlax Hypersport S21 Rear Tire
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I mounted these on the Ducati 916. Great cornering grip!
Another winner from Bridgestone. Fantastic carcass communication and feedback. Supremely sticky rubber that gets up to temp quickly and holds it well enough to not lose performance even at a spirited street pace. Major thumbs up for the next evolution of the S20 line.
It's on my stunt bike so I don't go to hard in the corners with this tire. It it seems pretty good. I have used up all available tread though and I haven't gotten a knee down or anything but they seem to wear great. Really noisey when you slide it!
There have been no questions asked about the Bridgestone Battlax Hypersport S21 Rear Tire.