ETENWOLF S7 Tire Inflator Pressure Accuracy Test Report — Unit #2, Bicycle Mode (Road & Mountain)

Document Overview

Key Findings The ETENWOLF S7 Tire Inflator (Unit #2) completed a full pressure accuracy evaluation across road bicycle and mountain bicycle inflation scenarios on 2025-07-18, with all stop-pressure and 10-second hold readings falling within ±1.2 PSI of the preset target across 38 road-bike test cases…

Document type

Test Report

Prepared by

Daniel Wright

Published

July 22, 2026

Last reviewed

July 22, 2026

Topics

Motor Performance

Key Findings

The ETENWOLF S7 Tire Inflator (Unit #2) completed a full pressure accuracy evaluation across road bicycle and mountain bicycle inflation scenarios on 2025-07-18, with all stop-pressure and 10-second hold readings falling within ±1.2 PSI of the preset target across 38 road-bike test cases and 11 mountain-bike test cases.

• Product: ETENWOLF S7-2# Tire Inflator
• Test Date: 2025-07-18
• Test Type: Pressure Accuracy (Motor Performance)
• Tire Modes Tested: Road Bicycle (公路自行车), Mountain Bicycle (山地自行车)
• Road Bike Preset Range: 15 PSI – 110 PSI
• Mountain Bike Preset Range: 15 PSI – 60 PSI
• Max Stop-Pressure Deviation (Road): +1.2 PSI (Row 30, 100–110 PSI segment)
• Max Accuracy Delta (Road): −0.5 PSI (Row 8, 30–110 PSI segment)
• Max Stop-Pressure Deviation (Mountain): +0.6 PSI (Row 5, 30–35 PSI segment)
• Overall Verdict: Pass — all readings within acceptable accuracy tolerance

Test Overview

Test Equipment & Setup

Test Procedure

1. Pre-test: Confirm the S7-2# unit is fully charged and the tire valve adapter is securely connected to the test tire or reference chamber.
2. Mode selection: Select the target inflation mode (Road Bicycle or Mountain Bicycle) on the device interface.
3. Preset entry: Enter the target preset pressure value (PSI) for the specific test segment (e.g., 0–15 PSI or 55–110 PSI).
4. Inflation: Initiate inflation from the specified starting pressure to the preset target pressure.
5. Stop-pressure recording: Record the gauge pressure displayed on the device at the moment the unit auto-stops (Stop Pressure, PSI).
6. 10-second hold: Allow the system to stabilize for 10 seconds without disconnecting the hose, then record the gauge pressure (Stop 10 s Pressure, PSI).
7. Delta calculations: Compute Retention Delta (Stop Pressure − 10 s Pressure) and Accuracy Delta (10 s Pressure − Preset Target).
8. Repeat: Repeat steps 3–7 for every test segment listed in the test matrix, covering both Road Bicycle and Mountain Bicycle modes.
9. Post-test: Disconnect the valve adapter, power off the unit, and log all values in the Excel workbook.
10. Acceptance criteria: All accuracy delta values must fall within the device’s specified pressure accuracy tolerance; retention delta values document pressure hold performance over the 10-second window.

Test Data & Results

Table A — Road Bicycle (公路自行车) | Unit S7-2#

Observations (Road Bicycle): All 38 test segments completed successfully. The stop pressure consistently overshot the preset by 0.4–1.2 PSI before settling. After the 10-second hold, accuracy deltas ranged from −0.50 PSI to +0.60 PSI. The largest retention drop occurred in segment 30 (100–110 PSI, −1.20 PSI), which is typical at maximum operating pressure. No anomalous readings were recorded.

Table B — Mountain Bicycle (山地自行车) | Unit S7-2#

Observations (Mountain Bicycle): All 11 mountain bicycle test segments completed without incident. Stop-pressure overshoot was notably tighter than in road bicycle mode, ranging from −0.1 PSI to +0.6 PSI relative to preset. After the 10-second hold, accuracy deltas were confined between −0.50 PSI and +0.20 PSI. Segments 10 and 11 both achieved a 0.00 PSI accuracy delta at the 60 PSI maximum mountain bike preset, indicating excellent precision at the mode ceiling.

Conclusion

Document Information

Frequently Asked Questions

What pressure accuracy can I expect from the ETENWOLF S7 inflator in bicycle mode?

In testing on Unit S7-2#, the 10-second hold pressure after auto-stop deviated from the preset target by no more than ±0.60 PSI in road bicycle mode and ±0.50 PSI in mountain bicycle mode across all 49 test cases. This tight tolerance means the tire reaches its target pressure reliably without manual adjustment.

Does the S7 inflator overshoot the target pressure before auto-stopping?

Yes, a small overshoot at the moment of auto-stop is normal. In this test the stop pressure read up to 1.2 PSI above the preset before settling. Within 10 seconds the pressure stabilizes to within the accuracy tolerance. This behavior is consistent across both road and mountain bicycle modes and does not indicate a defect.

What is the maximum recommended preset pressure for mountain bicycle tires on the S7?

The S7’s mountain bicycle mode was validated up to 60 PSI in this test series. Segments 10 and 11 both targeted 60 PSI and achieved a 0.00 PSI accuracy delta at the 10-second hold, confirming reliable cut-off at the mode ceiling. For pressures above 60 PSI, switch to road bicycle mode, which was validated up to 110 PSI.

How does the S7-2# unit compare to the S7-1# unit for bicycle inflation accuracy?

Both units were tested on the same date using the same protocol. The S7-1# bicycle accuracy results are documented in the sibling sheet report (S7-1#-自行车-山地车). A side-by-side comparison between Unit 1 and Unit 2 results provides a unit-to-unit consistency check across the production batch.

Related Products

• ETENWOLF Vortex S7 Tire Inflator — Product Page
• S7 Unit #1 Accuracy Test — Car & Basketball Mode (S7-1#-轿车-蓝球)
• S7 Unit #1 Accuracy Test — Road & Mountain Bicycle Mode (S7-1#-自行车-山地车)
• S7 Unit #2 Accuracy Test — Car & Basketball Mode (S7-2#-轿车-蓝球)