Change of Speeds
Also known as: speed variation, changing speeds
Change of speeds is a pitching strategy of deliberately varying pitch velocity — not just pitch type — to disrupt a hitter's timing, most commonly by mixing a changeup in with a full-speed fastball or movement pitch.
Hitters calibrate their swing timing to the velocity they see most often in an at-bat. A pitcher who can maintain identical arm speed and delivery mechanics while producing a meaningfully slower pitch — the essence of the changeup — exploits that calibration directly, causing hitters to swing well before the ball arrives. Change of speeds extends beyond just the changeup, though: subtle velocity variation across fastballs, or intentionally speeding up and slowing down a movement pitch's effective velocity through location and setup, all fall under the same strategic umbrella.
Track not just changeup usage but velocity variance across your entire fastball population — a few miles per hour of controlled variation within the "same" pitch adds a layer of deception hitters rarely account for.
Example
After two fastballs at full velocity, the pitcher throws an identical-looking changeup ten miles per hour slower, and the hitter's swing is well out in front of the ball.
Why it matters
Velocity alone does not win at-bats — the contrast between speeds is often what actually generates the swing-and-miss, which is why even hard throwers need a change of speeds.
How it shows up on video
Compare arm speed and delivery tempo across pitches of different velocities — effective change of speeds shows identical arm mechanics with only the release producing the speed difference, while poor change of speeds shows visibly slower arm action that tips the pitch.
Common mistakes
- Slowing the arm circle itself to take speed off the pitch, which telegraphs the change before release
- Using the same off-speed pitch so predictably that hitters simply wait for it
- Failing to locate off-speed pitches, leaving hittable pitches out over the plate because velocity alone was expected to fool the hitter
In SwingVantage Motion Lab
Motion Lab compares arm-circle speed and tempo across a pitcher's full-velocity and off-speed pitches to confirm whether the change in ball speed is coming from the wrist and grip rather than a visibly slower arm.
Frequently asked questions
Is change of speeds the same thing as throwing a changeup?
The changeup is one tool for it, but change of speeds also includes velocity variation across other pitch types and locations to keep hitters off a single timing rhythm.
Related terms
- ChangeupA changeup is an off-speed pitch thrown with the same windmill motion as the fastball but 10-20 mph slower, disrupting the hitter's timing so they commit early and swing ahead of the ball.
- Pitch SequencingPitch sequencing is the deliberate ordering of pitches across an at-bat — using pitch type, speed, location, and movement to set up and exploit a hitter's reactions.
- Adjusting to Speed ChangesAdjusting to speed changes is a hitter's ability to recalibrate load and swing timing mid-at-bat when a pitcher mixes in a slower pitch after establishing a faster one, avoiding the classic "way out in front" miss on a changeup.
Related guides & benchmarks
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