Tires provide more than just grip to me. I consider the profile of the tire, the stiffness of the carcass, or how the tire actually feels. I appreciate a tire that gives me confidence.
I recently switched from a q3+ to the rosso iii and while the pirelli had fun handling characteristics, I had much more control and confidence, particularly in the trail braking stage, with the q3+. The pirelli had a much softer carcass and felt vague and uninspiring on turn in and on the side of the tire. The grip was there, but it never really communicated it. The rear was soft too, which made the ride a little softer but also caused the rear end to pump where it normally wouldn't. I only really noticed it had slightly less grip when aggressively downshifting for corners, when the rear tire would slide when it normally wouldn't with the q3. Overall, it was still a fun tire, but only really because it made the bike have handling quirks. It wasn't necessarily a fast tire in my opinion. Can't overlook how great the mileage is on this tire though. What I'm trying to saying is, while sport touring tires might have enough grip, they might not have the other aspects that make a tire inspire you to go fast.
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