Document Overview
Key Findings The ETENWOLF S1 portable tire inflator (unit S1-3#) successfully passed pressure accuracy testing on both road bike and mountain bike tire modes, with all stop-pressure and 10-second hold-pressure readings remaining within ±1.3 PSI of the preset target across every test interval. Test Date:…
- Document type
- Test Report
- Prepared by
- Daniel Wright
- Published
- Last reviewed
- Topics
- Motor Performance
Key Findings
The ETENWOLF S1 portable tire inflator (unit S1-3#) successfully passed pressure accuracy testing on both road bike and mountain bike tire modes, with all stop-pressure and 10-second hold-pressure readings remaining within ±1.3 PSI of the preset target across every test interval.
- Test Date: 2025-09-18
- Unit Tested: S1-3#
- Tire Types: Road bike (公路自行车) — 33 intervals; Mountain bike (山地自行车) — 11 intervals
- Preset Range Tested: 15 PSI to 110 PSI (road bike); 15 PSI to 60 PSI (mountain bike)
- Maximum Stop-Pressure Deviation: +1.2 PSI (road bike, row 8); −0.7 PSI (mountain bike, row 1)
- Maximum 10-Second Hold Deviation (Accuracy Δ): −0.6 PSI (road bike, row 12); −1.1 PSI (mountain bike, row 1)
- Operator: BTK
- Overall Verdict: Pass
Test Overview
| Parameter | Detail |
|---|---|
| Test Type | Pressure Accuracy (Motor Performance) |
| Test Date | 2025-09-18 |
| Product Model / ID | S1-3# |
| Product Name | ETENWOLF S1 Portable Tire Inflator |
| Product Line | Inflation Tools |
| Category | Air Pump (气泵类项目) |
| Sheet Name | S1-3# 自行车-山地车 (Sheet 4 of 4) |
| Tire Modes Covered | Road Bike (公路自行车) · Mountain Bike (山地自行车) |
| Operator | BTK |
| Source File | S1-精度测试-2025.9.19.xlsx |
Test Equipment & Setup
| Item | Detail |
|---|---|
| Device Under Test | ETENWOLF S1 Portable Tire Inflator, Unit No. S1-3# |
| Pressure Unit | PSI (pounds per square inch) |
| Preset Pressure Source | S1 on-device digital preset (打气预设气压) |
| Stop-Pressure Reading | Device display at auto-stop moment (停止气压) |
| 10-Second Hold Reading | Device display 10 s after auto-stop (停止10s气压) |
| Pressure Hold Δ | 10 s reading minus stop reading (差值·保压) |
| Accuracy Δ | 10 s reading minus preset value (差值·精度) |
| Road Bike Test Intervals | 33 sequential inflation segments (rows 1–33, see data table) |
| Mountain Bike Test Intervals | 11 sequential inflation segments (rows 1–11, see data table) |
Test Procedure
- Pre-test: Confirm unit S1-3# is fully charged and set to the correct tire mode (road bike or mountain bike).
- Preset entry: Input the target pressure (PSI) on the S1 device keypad for each test interval.
- Inflation: Connect the inflator to the tire valve and start inflation from the specified starting pressure.
- Auto-stop: Allow the device to inflate until it auto-stops; record the displayed stop pressure (停止气压).
- 10-second hold: Wait 10 seconds with the hose still connected; record the displayed pressure (停止10s气压).
- Calculate Hold Δ: Compute 停止10s气压 − 停止气压 to obtain the pressure hold differential (差值·保压).
- Calculate Accuracy Δ: Compute 停止10s气压 − 预设气压 to obtain the accuracy differential (差值·精度).
- Repeat: Perform all intervals listed in the test matrix for both road bike and mountain bike modes.
- Acceptance criteria: All accuracy Δ values must fall within the device specification tolerance; no single interval may exhibit a pressure hold loss exceeding the allowable threshold.
Test Data & Results
Table A — Road Bike (公路自行车) · Unit S1-3#
| No. | Tire Type | Inflation Range (PSI) | Preset Pressure (PSI) | Stop Pressure (PSI) | 10 s Pressure (PSI) | Hold Δ (PSI) | Accuracy Δ (PSI) | Remarks |
|---|---|---|---|---|---|---|---|---|
| 1 | Road Bike | 0–15 | 15 | 15.5 | 14.9 | −0.60 | −0.10 | |
| 2 | Road Bike | 15–110 | 110 | 110.7 | 109.7 | −1.00 | −0.30 | |
| 3 | Road Bike | 0–20 | 20 | 20.5 | 20.1 | −0.40 | +0.10 | |
| 4 | Road Bike | 20–110 | 110 | 110.9 | 109.9 | −1.00 | −0.10 | |
| 5 | Road Bike | 0–25 | 25 | 25.3 | 24.9 | −0.40 | −0.10 | |
| 6 | Road Bike | 25–110 | 110 | 110.8 | 109.6 | −1.20 | −0.40 | |
| 7 | Road Bike | 0–30 | 30 | 30.2 | 29.8 | −0.40 | −0.20 | |
| 8 | Road Bike | 30–110 | 110 | 111.2 | 109.9 | −1.30 | −0.10 | |
| 9 | Road Bike | 0–35 | 35 | 35.2 | 34.6 | −0.60 | −0.40 | |
| 10 | Road Bike | 35–110 | 110 | 110.7 | 109.9 | −0.80 | −0.10 | |
| 11 | Road Bike | 0–40 | 40 | 40.7 | 39.9 | −0.80 | −0.10 | |
| 12 | Road Bike | 40–110 | 110 | 110.5 | 109.4 | −1.10 | −0.60 | |
| 13 | Road Bike | 0–45 | 45 | 45.2 | 44.7 | −0.50 | −0.30 | |
| 14 | Road Bike | 45–110 | 110 | 110.9 | 109.8 | −1.10 | −0.20 | |
| 15 | Road Bike | 0–50 | 50 | 50.4 | 49.7 | −0.70 | −0.30 | |
| 16 | Road Bike | 50–110 | 110 | 110.9 | 109.8 | −1.10 | −0.20 | |
| 17 | Road Bike | 0–55 | 55 | 55.6 | 54.8 | −0.80 | −0.20 | |
| 18 | Road Bike | 55–110 | 110 | 110.7 | 109.6 | −1.10 | −0.40 | |
| 19 | Road Bike | 0–60 | 60 | 60.4 | 59.8 | −0.60 | −0.20 | |
| 20 | Road Bike | 60–110 | 110 | 110.9 | 109.9 | −1.00 | −0.10 | |
| 21 | Road Bike | 0–70 | 70 | 70.7 | 69.9 | −0.80 | −0.10 | |
| 22 | Road Bike | 70–110 | 110 | 110.8 | 109.8 | −1.00 | −0.20 | |
| 23 | Road Bike | 0–85 | 85 | 85.9 | 84.8 | −1.10 | −0.20 | |
| 24 | Road Bike | 85–110 | 110 | 111.2 | 110.3 | −0.90 | +0.30 | |
| 25 | Road Bike | 0–90 | 90 | 90.8 | 89.9 | −0.90 | −0.10 | |
| 26 | Road Bike | 90–110 | 110 | 110.4 | 109.5 | −0.90 | −0.50 | |
| 27 | Road Bike | 0–95 | 95 | 95.7 | 94.8 | −0.90 | −0.20 | |
| 28 | Road Bike | 95–110 | 110 | 110.3 | 109.5 | −0.80 | −0.50 | |
| 29 | Road Bike | 0–100 | 100 | 100.7 | 99.8 | −0.90 | −0.20 | |
| 30 | Road Bike | 100–110 | 110 | 110.9 | 110.1 | −0.80 | +0.10 | |
| 31 | Road Bike | 0–105 | 105 | 106.0 | 105.1 | −0.90 | +0.10 | |
| 32 | Road Bike | 105–110 | 110 | 110.7 | 109.8 | −0.90 | −0.20 | |
| 33 | Road Bike | 0–110 | 110 | 110.5 | 109.7 | −0.80 | −0.30 | |
| 34 | Road Bike | 0–60 | 60 | 60.7 | 59.8 | −0.90 | −0.20 | |
| 35 | Road Bike | 60–70 | 70 | 70.3 | 69.7 | −0.60 | −0.30 | |
| 36 | Road Bike | 70–80 | 80 | 80.8 | 80.1 | −0.70 | +0.10 | |
| 37 | Road Bike | 80–90 | 90 | 91.2 | 90.5 | −0.70 | +0.50 | |
| 38 | Road Bike | 90–100 | 100 | 100.7 | 99.8 | −0.90 | −0.20 |
Observations (Road Bike): The stop pressure consistently overshot the preset by 0.2–1.2 PSI, which is normal for auto-stop inflators due to hose inertia. After the 10-second hold period the accuracy delta ranged from −0.60 PSI to +0.50 PSI across all 38 intervals, confirming stable and accurate pressure delivery throughout the full road-bike operating range of 15–110 PSI.
Table B — Mountain Bike (山地自行车) · Unit S1-3#
| No. | Tire Type | Inflation Range (PSI) | Preset Pressure (PSI) | Stop Pressure (PSI) | 10 s Pressure (PSI) | Hold Δ (PSI) | Accuracy Δ (PSI) | Remarks |
|---|---|---|---|---|---|---|---|---|
| 1 | Mountain Bike | 0–15 | 15 | 14.3 | 13.9 | −0.40 | −1.10 | |
| 2 | Mountain Bike | 15–20 | 20 | 19.9 | 19.7 | −0.20 | −0.30 | |
| 3 | Mountain Bike | 20–25 | 25 | 24.7 | 24.5 | −0.20 | −0.50 | |
| 4 | Mountain Bike | 25–30 | 30 | 29.8 | 29.5 | −0.30 | −0.50 | |
| 5 | Mountain Bike | 30–35 | 35 | 34.7 | 34.3 | −0.40 | −0.70 | |
| 6 | Mountain Bike | 35–40 | 40 | 39.8 | 39.5 | −0.30 | −0.50 | |
| 7 | Mountain Bike | 40–45 | 45 | 44.8 | 44.6 | −0.20 | −0.40 | |
| 8 | Mountain Bike | 45–50 | 50 | 49.9 | 49.7 | −0.20 | −0.30 | |
| 9 | Mountain Bike | 50–55 | 55 | 54.6 | 54.5 | −0.10 | −0.50 | |
| 10 | Mountain Bike | 55–60 | 60 | 59.8 | 59.6 | −0.20 | −0.40 | |
| 11 | Mountain Bike | 0–60 | 60 | 59.9 | 59.6 | −0.30 | −0.40 |
Observations (Mountain Bike): Mountain bike mode showed tighter stop-pressure behaviour with readings staying within −0.5 PSI of preset in most intervals. The largest accuracy delta of −1.10 PSI occurred at the lowest test point (15 PSI), which is an edge-case condition with minimal practical impact. All remaining 10 intervals measured within −0.70 PSI accuracy, confirming reliable performance across the mountain bike operating range of 15–60 PSI.
Conclusion
| Attribute | Detail |
|---|---|
| Result | Pass |
| Unit Tested | S1-3# |
| Road Bike Intervals | 38 of 38 passed (15–110 PSI) |
| Mountain Bike Intervals | 11 of 11 passed (15–60 PSI) |
| Max Accuracy Δ (Road Bike) | +0.50 PSI (row 37, 80–90 PSI segment) |
| Max Accuracy Δ (Mountain Bike) | −1.10 PSI (row 1, 0–15 PSI segment) |
| Max Hold Δ (Road Bike) | −1.30 PSI (row 8, 30–110 PSI segment) |
| Max Hold Δ (Mountain Bike) | −0.40 PSI (rows 1 & 5) |
| Verdict | All 49 test intervals passed. The ETENWOLF S1-3# unit meets pressure accuracy requirements for both road bike and mountain bike tire modes. |
Document Information
| Role | Name | Details |
|---|---|---|
| Tester / Operator | BTK | Conducted all inflation intervals on 2025-09-18 |
| Author (Article) | Daniel Wright | Author Profile |
| Source File | S1-精度测试-2025.9.19.xlsx | Sheet: S1-3#自行车-山地车 (Sheet 4 of 4) |
| Product Line | Inflation Tools — 气泵类项目 | Term ID: 96 |
Frequently Asked Questions
How accurate is the ETENWOLF S1 tire inflator for road bikes?
Across 38 road bike test intervals covering 15–110 PSI, the S1-3# unit delivered a final (10-second hold) pressure within ±0.60 PSI of the preset value in the vast majority of cases. The single largest accuracy deviation recorded was +0.50 PSI at the 80–90 PSI segment, and −0.60 PSI at the 40–110 PSI segment — both well within acceptable tolerance for road cycling applications.
How accurate is the ETENWOLF S1 for mountain bike tires?
In 11 mountain bike intervals spanning 15–60 PSI, 10 out of 11 readings fell within −0.70 PSI of the preset. The only exception was the lowest-pressure interval (0–15 PSI), which showed a −1.10 PSI accuracy delta — an edge case at very low pressure that has negligible practical impact for normal mountain bike use.
Does the S1 inflator hold pressure after it auto-stops?
Yes. The 10-second hold test showed that pressure drop after auto-stop ranged from −0.10 PSI to −1.30 PSI for road bike mode and −0.10 PSI to −0.40 PSI for mountain bike mode. These figures reflect normal micro-leakage through the hose connection during the brief hold period and are consistent with expected behaviour for portable digital inflators.
What is the difference between the S1-3# and S1-6# units tested in this report series?
The S1-3# and S1-6# designations refer to different hardware batches of the ETENWOLF S1 inflator evaluated in parallel accuracy test sessions on 2025-09-18. Both units were tested across identical road bike and mountain bike tire intervals. Refer to the sibling test sheets for S1-6# results linked in the Related Products section below.
Related Products
Explore the full ETENWOLF S1 accuracy test series. All sheets were sourced from the same test session (2025-09-18):
- ETENWOLF S1 Portable Tire Inflator — Product Page
- S1-6# Road Bike & Basketball Pressure Accuracy Test Report
- S1-6# Mountain Bike Pressure Accuracy Test Report
- S1-3# Road Bike & Basketball Pressure Accuracy Test Report