Methodology
Catalog data last verified October 30, 2026. We synthesize public listing signals and editorial fit judgment — we do not stage fake lab benches or publish marketplace stars as if they were PumpGauge instrument readings.
Where the data comes from
- Retailer / manufacturer listings — brand, model, list price, feature bullets, pressure and power claims, hose notes when published.
- Normalized catalog — one schema across 163 products so guides and gear pages share the same ASIN-linked row (163 with list price, 163 with a listing rating snapshot).
- Owner-voice layers — marketplace review snippets and structured owner quotes when the scrape captured them. Themes are paraphrased or quoted; we do not invent people.
- Editorial overlays — buy/skip boundaries, compare scorecards, and PSI calculator math. Judgment is labeled as guidance, not a proprietary lab score.
Fields we track
| Field | How we treat it |
|---|---|
| Brand / model name | Normalized product identity for URLs and comparisons |
| List price | Retailer snapshot at catalog build — not a live quote |
| Max PSI / pressure range | Vendor claim; verify against your tire placard |
| Power source | 12V corded, AC, cordless battery, or dual |
| Duty cycle / cool-down | When published — critical for multi-tire fills |
| Hose length / chuck type | Fitment for duals, RVs, and awkward valves |
| Weight / dimensions | Portability signals when the listing publishes them |
| Owner rating + count | Marketplace aggregate, labeled as listing — never “our lab score” |
| Feature bullets | Cleaned & deduped; gift/promo lines removed |
| Review snippets | Paraphrased or quoted themes with attribution rules |
How a guide gets built
- Intent — map a reader job (daily top-off, truck fill, RV, gauge accuracy workflow, trail air-down) to a shortlist, not a dump of every SKU.
- Candidate pool — pull catalog rows that match power type, tire class, and price band for that job.
- Evidence pass — keep listing claims that are checkable; drop gift-promo bullets and duplicated paste; flag missing duty cycle / CFM as unknowns.
- Fit writing — every pick states who it suits and who should skip it. Compare pieces use the same scorecard axes so readers can re-check the trade-offs.
- Disclosure — affiliate relationships appear at the top of articles and near buy links. Commission does not reorder shortlists.
Currently 16 public guides and compares use this pipeline. Cannibal near-duplicates are redirected to a single pillar URL.
Scoring language (and what it is not)
- Listing rating — marketplace aggregate shown as “owner listing ★” with review count. Never presented as a PumpGauge lab score.
- Compare scorecards — relative editorial marks on axes like portability, fill practicality, and feature completeness from published specs. Relative ≠ measured.
- PSI calculator — physics-style cold-tire estimates from load, temperature, and surface presets. Outputs are decision aids; your door placard and a trusted gauge win disputes.
Weighting we refuse to hide
When a shortlist ranks products, practical fit beats marketing max-PSI. Typical priority order for inflators: (1) power source matches the vehicle, (2) duty cycle / heat behavior for the tire volume, (3) hose and chuck usability, (4) auto shut-off and gauge readability, (5) list price. A cheaper cordless unit can beat a louder “150 PSI” claim if the job is passenger top-offs.
What we do not do
- Invent PSI accuracy claims without a measured source we can cite.
- Publish star ratings as if they were proprietary instrument results.
- Fabricate owner quotes, authors, or credentials.
- Hide affiliate relationships or sell ranking slots.
- Leave duplicate Amazon bullets (including gift-promo lines) on product pages.
- Pretend thin catalog pages are full reviews — gear SKUs remain noindex until they carry enough original fit content to deserve indexation.
Sample size & limits
Owner-voice samples are whatever the retailer chose to surface — often dozens to tens of thousands of reviews for popular ASINs, but always a biased public sample. We cannot audit every unit sold. Spec sheets omit CFM, noise, and true duty cycle more often than marketing admits; when the listing is silent, we say so instead of inventing a number.
Safety: tire pressure affects handling and load capacity. Follow the vehicle placard, a calibrated gauge, and manufacturer instructions. PumpGauge does not certify vehicle setups.
Sources we cite (not affiliate)
When we talk about cold-tire practice, gauge accuracy classes, or vehicle placard PSI, we lean on primary references readers can open themselves:
- NHTSA — tires & consumer tire-pressure guidance
- ANSI — pressure-gauge accuracy classes (e.g. B40.7 / related B40 series)
- SaferCar / NHTSA — tire ratings & shopper resources
Manufacturer spec sheets and door-jamb placards remain the authority for a specific vehicle. Listing CFM / PSI claims are attributed as retailer copy, not PumpGauge lab results.
Updates & corrections
Material catalog or methodology changes are listed on the changelog. Factual corrections: [email protected]. Related reading: About, Authors, Gear catalog.