ETENWOLF S1 Tire Inflator Pressure Accuracy Test Report — Bicycle Mode (S1-6# Unit, Road & Mountain Bike)

Document Overview

Key Findings The ETENWOLF S1 portable tire inflator (unit S1-6#) was tested for pressure accuracy across road bicycle and mountain bike inflation scenarios on 2025-09-18 and 2025-09-19. All measured stop pressures and 10-second hold pressures remained within ±1.2 PSI of the preset target across every…

Document type

Test Report

Prepared by

Daniel Wright

Published

July 22, 2026

Last reviewed

July 22, 2026

Topics

Motor Performance

Key Findings

The ETENWOLF S1 portable tire inflator (unit S1-6#) was tested for pressure accuracy across road bicycle and mountain bike inflation scenarios on 2025-09-18 and 2025-09-19. All measured stop pressures and 10-second hold pressures remained within ±1.2 PSI of the preset target across every test interval, confirming consistent auto-stop precision and acceptable pressure retention.

• Product: ETENWOLF S1 Portable Tire Inflator, Unit S1-6#
• Test dates: 2025-09-18 (road bike) and 2025-09-19 (mountain bike)
• Tester group: BTK
• Road bike preset range tested: 15–110 PSI (38 intervals)
• Mountain bike preset range tested: 15–60 PSI (11 intervals)
• Max overshoot at stop: +1.2 PSI (road bike, row 37: 80→90 PSI preset)
• Max pressure drop after 10 s hold: −1.1 PSI (multiple road bike high-pressure intervals)
• Accuracy delta range (road bike): −0.50 to +0.40 PSI
• Accuracy delta range (mountain bike): −0.79 to −0.10 PSI
• Overall verdict: PASS — all readings within acceptable accuracy tolerance

Test Overview

Test Equipment & Setup

Test Procedure

1. Pre-test: Confirm the ETENWOLF S1 unit (S1-6#) is fully charged and functioning. Attach the appropriate valve adapter to the target bicycle tire (road or mountain). Deflate the tire to the specified starting pressure for each interval.
2. Preset entry: Set the target preset pressure on the S1 device display to the value specified in the test matrix (PSI).
3. Inflation: Activate the inflator and allow it to run until the auto-stop function triggers.
4. Stop pressure recording: Immediately read and record the pressure gauge reading at the moment of auto-stop (Stop Pressure, PSI).
5. 10-second hold: Wait 10 seconds without disconnecting the hose. Record the pressure gauge reading (10 s Hold Pressure, PSI).
6. Delta calculation: Calculate Retention Delta = Stop Pressure − 10 s Hold Pressure. Calculate Accuracy Delta = 10 s Hold Pressure − Preset Pressure.
7. Repeat: Repeat steps 1–6 for each row in the test matrix, covering all starting-pressure-to-preset intervals for both road bicycle and mountain bicycle tire types.
8. Post-test: Disconnect valve adapter. Record all values in the test log.
9. Acceptance criteria: All stop pressures must be within a reasonable overshoot margin of the preset value; accuracy delta must demonstrate consistent auto-stop behavior across the full pressure range. No catastrophic over-inflation or persistent under-inflation permitted.

Test Data & Results

Table A — Road Bicycle (公路自行车) | Test Date: 2025-09-18 | Unit: S1-6#

Table B — Mountain Bicycle (山地自行车) | Test Date: 2025-09-19 | Unit: S1-6#

Observations: Road bicycle tests (Table A) cover 38 intervals spanning 15 PSI to 110 PSI, including both full-range inflations from zero and incremental step inflations. The auto-stop mechanism consistently halted within +1.2 PSI of the preset, with the 10-second hold pressure confirming stable retention. The largest positive accuracy delta (+0.40 PSI, row 37) and largest negative accuracy delta (−0.50 PSI, rows 4 and 13) both fall within operational tolerance. Mountain bicycle tests (Table B) cover 11 intervals spanning 15 PSI to 60 PSI. The first interval (0→15 PSI) showed the largest negative accuracy delta at −0.79 PSI, consistent with low-pressure valve dynamics; all remaining intervals were within ±0.50 PSI. Retention deltas across both tire types were uniformly negative (pressure drops after disconnection), which is expected due to valve bleed on hose removal.

Conclusion

Document Information

Frequently Asked Questions

What pressure accuracy can I expect from the ETENWOLF S1 when inflating bicycle tires?

In BTK laboratory testing across 49 intervals (38 road bike, 11 mountain bike), the S1 unit S1-6# held accuracy deltas between −0.79 PSI and +0.40 PSI of the preset target. In practical terms, the 10-second post-stop reading was within approximately ±0.8 PSI of the set pressure for every single test interval.

Does the ETENWOLF S1 auto-stop function work at both low and high bicycle tire pressures?

Yes. Testing confirmed reliable auto-stop behavior from 15 PSI (low-pressure mountain bike range) all the way up to 110 PSI (high-pressure road bike range). The stop pressure overshoot never exceeded +1.2 PSI above the preset across all 49 test runs.

Why does the pressure read slightly lower 10 seconds after the S1 stops inflating?

The small pressure drop (retention delta) recorded 10 seconds after auto-stop is caused by minor air bleed through the valve adapter during hose connection and normal micro-seating of the valve core. In this test the largest retention drop was −1.10 PSI, which is within expected behavior and does not indicate a device fault.

Is the ETENWOLF S1 suitable for both road bicycles and mountain bicycles?

Yes. The S1 was tested on road bicycle tires up to 110 PSI and mountain bicycle tires up to 60 PSI. Both tire categories passed with consistent accuracy, making the S1 a versatile option for cyclists who ride multiple bike types.

Related Products

Explore the full ETENWOLF S1 accuracy test series. The following sibling test sheets from the same workbook (S1-精度测试-2025.9.19.xlsx) are also available:

• S1-6# — Car Tire & Basketball Accuracy Test (S1-6#-轿车-蓝球)
• S1-3# — Car Tire & Basketball Accuracy Test (S1-3#-轿车-蓝球)
• S1-3# — Bicycle Mountain Bike Accuracy Test (S1-3#自行车-山地车)

View the full product page: ETENWOLF S1 Portable Tire Inflator