ETENWOLF S0 Portable Bike Pump Pressure Accuracy Test Report — Sample 1# Road & Mountain Bike (2025-08-03)

Document Overview

Key Findings The ETENWOLF S0 Sample 1# unit was tested across 38 road-bike inflation sequences and 11 mountain-bike inflation sequences; all measured stop pressures and 10-second hold pressures remained within ±0.5 PSI of the preset target, confirming acceptable accuracy and pressure-retention performance across the full…

Document type

Test Report

Prepared by

Daniel Wright

Published

July 22, 2026

Last reviewed

July 22, 2026

Topics

Motor Performance

Key Findings

The ETENWOLF S0 Sample 1# unit was tested across 38 road-bike inflation sequences and 11 mountain-bike inflation sequences; all measured stop pressures and 10-second hold pressures remained within ±0.5 PSI of the preset target, confirming acceptable accuracy and pressure-retention performance across the full operating range.

• Test Date: 2025-08-03
• Sample ID: S0-1#
• Tester: BTK
• Tire Types Tested: Road bicycle (公路自行车) and mountain bicycle (山地自行车)
• Preset Pressure Range Tested: 15 PSI – 110 PSI (road); 15 PSI – 60 PSI (mountain)
• Maximum Accuracy Deviation Observed: −0.50 PSI (row 38, road bike, 90–100 PSI range)
• Maximum Pressure-Retention Deviation Observed: −0.50 PSI (row 38)
• Overall Verdict: Pass — all readings within acceptable tolerance

Test Overview

Test Equipment & Setup

Test Procedure

1. Pre-test: Confirm sample unit is S0-1#; verify tire valve connections are secure and baseline tire pressure is at or below the lower bound of each test range.
2. Set preset pressure: Enter the target inflation value (PSI) on the S0 unit’s digital display.
3. Inflate: Activate the pump and allow it to run until it auto-stops at the preset pressure.
4. Record stop pressure: Immediately read and log the pressure shown at the moment the pump stops (column: Stop Pressure PSI).
5. Wait 10 seconds: Keep the pump connected and record the pressure after a 10-second hold (column: 10 s Pressure PSI).
6. Calculate retention delta: 10 s Pressure − Stop Pressure (negative value indicates pressure drop).
7. Calculate accuracy delta: Stop Pressure − Preset Target (deviation of the auto-stop point from the preset).
8. Repeat for every inflation range and preset value listed in the test matrix (38 road-bike sequences; 11 mountain-bike sequences).
9. Post-test: Deflate tire to starting pressure before the next sequence; inspect unit for anomalies.
10. Acceptance criteria: All accuracy and retention deltas must remain within the product specification tolerance (observed maximum ±0.5 PSI).

Test Data & Results

Table A — Road Bicycle (公路自行车) | Sample S0-1#

Table B — Mountain Bicycle (山地自行车) | Sample S0-1#

Observations: All 49 test sequences (38 road + 11 mountain) produced stop pressures and 10-second hold pressures within ±0.5 PSI of the preset target. The largest single deviation was −0.50 PSI retention drop in road-bike sequence 38 (90–100 PSI range). Mountain-bike sequences showed tighter control, with the largest accuracy deviation of −0.30 PSI in sequence 3 (20–25 PSI). No anomalous readings or equipment faults were recorded.

Conclusion

Document Information

Frequently Asked Questions

What pressure accuracy can I expect from the ETENWOLF S0 bike pump?

In lab testing across 49 inflation sequences covering 15–110 PSI for road bikes and 15–60 PSI for mountain bikes, the S0 auto-stop pressure deviated no more than ±0.5 PSI from the preset target. The majority of readings were within ±0.3 PSI.

Does the ETENWOLF S0 hold pressure after it stops inflating?

Yes. In all 49 test sequences the pressure drop measured 10 seconds after the pump stopped was at most −0.5 PSI, and most sequences showed a drop of only −0.1 to −0.2 PSI, indicating reliable short-term pressure retention.

Is the ETENWOLF S0 suitable for both road and mountain bike tires?

Yes. The S0 was tested on road bicycle tires up to 110 PSI and mountain bicycle tires up to 60 PSI. Both tire types passed accuracy and retention checks, confirming the pump handles the full operating range of common bicycle tire pressures.

What is the maximum tested pressure for the ETENWOLF S0?

The highest preset pressure tested in this report was 110 PSI on road bicycle tires. The unit reached and held that pressure within the ±0.5 PSI accuracy band across all sequences targeting 110 PSI.

Related Products

The ETENWOLF S0 Portable Bike Pump was evaluated across four test sheets in the same Excel file. View the sibling test reports below:

• S0-1# Basketball Accuracy Test (S0-1#-蓝球)
• S0-2# Basketball Accuracy Test (S0-2#-蓝球)
• S0-2# Road & Mountain Bike Accuracy Test (S0-2#自行车-山地车)