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Automotive

Performance Tool W89311 Coil Spring Compressor for Vehicle Maintenance and Repair with Tempered Chrome Steel Jaws in Blow Molded Storage Case, 12-in Rod

Automotive3.0· 714 Amazon ratings

Bias-adjusted across 714 Amazon ratings, Bayesian-shrunk to the category prior so the headline score reflects relative quality — not a raw star average. Cohort: Automotive.

1.2%
Percentile · Global
0.9%
Percentile · Cohort
Automotive
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Performance Tool W89311 Coil Spring Compressor for Vehicle Maintenance and Repair with Tempered Chrome Steel Jaws in Blow Molded Storage Case, 12-in Rod

How the score was built

Amazon ratings
714

used for the Bayesian percentile

Raw star average
3.0 / 5

unadjusted Amazon mean

Bayesian avg
3.16

raw rating shrunk to the category prior

Reviewer-graph z
0.707

bias-corrected vs. each reviewer's baseline (0 qualifying)

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Same category · Automotive

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