In most cases, for 18u cruising around 60 won't really feel "slow" to anyone. IF (and this is a big IF) the pitcher has the ability to change speeds. If everything is at one speed then even 65 doesn't seem terribly fast to above average hitters after the first time through the batting order. We had a pitcher who could blow people away with 58mph because of her elite change up. Just anecdotal, but my dd would rather have faced 65 without a change up than 60 with a good change up.
That is kind of what I was getting at with the original question. 60 with an elite change up seems like it could be highly effective. 60 is fast enough that even good players have to respect the speed even if they can handle faster. Almost all great hitters can adjust to one speed.
But I have seen good pitchers that only throw 55 with a good change up. But the fastball doesn’t really scare teams so they can kind of sit back on both pitches. Adding 3-4 mph seems to make a larger difference than I probably expected. I guess that is why everyone chases speed.
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