FB Spin
Average spin rate of his four-seam fastballs and sinkers, in rpm.
Agreement with Savant
Checked weekly, for completed seasons only. Agreement tolerance: ±1.5.
Shown for: pitcher.
Formula
sum(fb_spin_sum) / NULLIF(sum(fb_spin_n), 0)
The same fastballs as FB Velo, less any with no spin rate.
Inputs
pitches.extraspitches.pitch_typepitches.pfx_xpitches.pfx_zplate_appearances.fb_spin_sumplate_appearances.fb_spin_n
Era caveats
Three tracking systems across the seasons shown
Statcast used TrackMan through 2019, Hawk-Eye for 2020–2022, and Hawk-Eye with bat tracking from 2023. The systems differ in what they measure and how precisely, so long spans cross a measurement boundary as well as a rule one.
Version history
- 2026-09-27: Added to the Explorer. Checked against the same Statcast Search figures: 803 of 804 pitchers in 2025 and 725 of 725 in 2016, the one miss a pitcher whose search rows include pitches with no movement reading, which Armside excludes.