ETENWOLF EV3 Inflator Precision Test Report — Road Bicycle 8# (PSI Accuracy, Bicycle Mode)

Document Overview

Key Findings The ETENWOLF EV3 inflator completed 38 inflation cycles on a road bicycle tire in Bicycle Mode, with all stop-pressure accuracy deviations staying within ±1.7 PSI of the preset target across the full 0–110 PSI working range. Unit Under Test: EV3 Inflator, Unit 8#…

Document type

Test Report

Prepared by

Daniel Wright

Published

July 22, 2026

Last reviewed

July 22, 2026

Topics

Motor Performance

Key Findings

The ETENWOLF EV3 inflator completed 38 inflation cycles on a road bicycle tire in Bicycle Mode, with all stop-pressure accuracy deviations staying within ±1.7 PSI of the preset target across the full 0–110 PSI working range.

• Unit Under Test: EV3 Inflator, Unit 8#
• Tire Type: Road Bicycle (公路自行车)
• Operating Mode: Bicycle Mode
• Pressure Range Tested: 0–110 PSI
• Total Test Cycles: 38
• Max Accuracy Deviation Observed: −0.90 PSI (row 18, 55–110 PSI segment)
• Max Retention Drop (Stop → 10 s): 1.70 PSI (rows 25, 29, 35, 37, 38)
• All cycles passed: stop pressure and 10-second hold pressure remained within acceptable tolerance of preset values

Test Overview

Test Equipment & Setup

Test Procedure

1. Pre-test: Confirm the EV3 unit is Unit 8#. Set operating mode to Bicycle Mode on the device display. Verify ambient conditions and that the tire valve connection is secure.
2. Set preset pressure: Enter the target preset pressure value (PSI) on the EV3 inflator for the current test segment.
3. Inflate from starting pressure: Begin inflation from the recorded starting pressure (e.g., 0 PSI, or the carry-over pressure from the previous segment).
4. Record stop pressure: Note the pressure reading on the gauge at the moment the inflator auto-stops (Stop Pressure, PSI).
5. Wait 10 seconds: Allow 10 seconds with the hose connected and record the stabilised pressure (10 s Hold Pressure, PSI).
6. Calculate retention delta: Compute Stop Pressure − 10 s Hold Pressure to obtain the retention (hold) delta.
7. Calculate accuracy delta: Compute 10 s Hold Pressure − Preset Pressure to obtain the accuracy deviation.
8. Repeat: Proceed to the next inflation range segment and repeat steps 2–7 for all 38 test rows.
9. Post-test: Review all accuracy deltas against the acceptance criterion. Note any anomalies in the Remarks column.

Acceptance Criteria: Accuracy deviation (10 s hold pressure vs. preset) must remain within the brand’s internal tolerance band. All remarks recorded as 自行车模式 (Bicycle Mode) with no fault flags observed in this dataset.

Test Data & Results

Observations: All 38 segments completed without fault flags. Accuracy deltas ranged from +0.80 PSI (low-pressure starts at 15 and 20 PSI presets) to −0.90 PSI (55–110 PSI segment, row 18). The largest retention drop was 1.70 PSI, observed in rows 25, 29, 35, and 37. Negative accuracy deltas dominate at higher preset pressures (≥50 PSI), indicating a slight systematic under-read after the 10-second hold, consistent with normal valve bleed-back behaviour. No anomalies or failure notes were recorded.

Conclusion

Document Information

Frequently Asked Questions

What pressure accuracy can I expect from the ETENWOLF EV3 inflator on a road bicycle tire?

Across 38 test segments spanning 0–110 PSI in Bicycle Mode, the EV3 Unit 8# showed accuracy deviations between +0.80 PSI and −0.90 PSI when comparing the 10-second stabilised pressure to the preset target. This means the delivered pressure after a 10-second hold is typically within 1 PSI of your set value throughout the road bicycle range.

Why does the stop pressure read higher than the preset, and then drop after 10 seconds?

The inflator over-pressurises slightly at the moment it auto-stops to compensate for the pressure drop that occurs when the hose is disconnected and the valve closes. The 10-second hold reading — taken with the hose still connected — reflects the stabilised in-tire pressure, which is the value used to calculate accuracy deviation against the preset.

Does the EV3 maintain accuracy across both low (15 PSI) and high (110 PSI) road bicycle pressures?

Yes. The test data covers presets from 15 PSI up to 110 PSI. At low presets (15–30 PSI) accuracy deltas trend slightly positive (up to +0.80 PSI), while at higher presets (50–110 PSI) they trend slightly negative (down to −0.90 PSI). Both ranges remain well within the tolerance band for road bicycle use.

How does EV3-公路自行车-8 differ from the EV3-公路自行车-9 test sheet?

EV3-公路自行车-8 (this report, Unit 8#) and EV3-公路自行车-9 are two separate sample units tested under the same road bicycle precision protocol. Comparing both sheets allows assessment of unit-to-unit consistency across the production batch.

Related Products

Explore other ETENWOLF EV3 inflator precision test reports from the same test batch:

• EV3 Precision Test — 4# (EV3-4#)
• EV3 Precision Test — 5# (EV3-5#)
• EV3 Precision Test — 6# (EV3-6#)
• EV3 Mountain Bike Precision Test — 4 (EV3-山地车-4)
• EV3 Mountain Bike Precision Test — 5 (EV3-山地车-5)
• EV3 Mountain Bike Precision Test — 6 (EV3-山地车-6)
• EV3 Road Bicycle Precision Test — 9 (EV3-公路自行车-9)