Document Overview
Key Findings The ETENWOLF EV3 inflator completed all 10 mountain bike precision test runs across the 0–45 PSI range, with stop-pressure accuracy consistently within ±0.5 PSI of preset and post-settle (10-second hold) pressure deviations remaining within ±0.6 PSI of the target — meeting acceptable precision…
- Document type
- Test Report
- Prepared by
- Daniel Wright
- Published
- Last reviewed
- Topics
- Motor Performance
Key Findings
The ETENWOLF EV3 inflator completed all 10 mountain bike precision test runs across the 0–45 PSI range, with stop-pressure accuracy consistently within ±0.5 PSI of preset and post-settle (10-second hold) pressure deviations remaining within ±0.6 PSI of the target — meeting acceptable precision tolerances for mountain bike tire inflation.
- Sheet: EV3-山地车-5 (Sheet 6 of 8)
- Test Date: 2025-04-08
- Operator/Brand Code: BTK
- Product Reference: EV3-5#
- Tire Type: Mountain Bike (山地自行车)
- Pressure Range Tested: 0–45 PSI across 10 incremental segments
- Max Stop-Pressure Deviation: +0.5 PSI (Run 1), −0.5 PSI observed indirectly via hold drop
- Max Hold Deviation (10 s): −0.6 PSI (Run 4, 20–45 PSI segment)
- Max Accuracy Deviation: −0.4 PSI (Run 4)
- Overall Verdict: Pass
Test Overview
| Field | Detail |
|---|---|
| Test Type | Inflation Precision / Pressure Accuracy |
| Sheet Name | EV3-山地车-5 |
| Sheet Index | 6 of 8 |
| Source File | EV3充气泵-精度测试-2025.4.26.xlsx |
| Test Date | 2025-04-08 |
| Operator Code | BTK |
| Product Number / Name | EV3-5# |
| Model | EV3 |
| Product Line | Inflation Tools |
| Category | Air Pump (气泵类项目) |
| Tire Type Tested | Mountain Bike (山地自行车) |
| Pressure Unit | PSI |
| Total Test Runs | 10 |
| Product URL | N/A |
Test Equipment & Setup
| Parameter | Detail |
|---|---|
| Device Under Test | ETENWOLF EV3 Inflator (Unit EV3-5#) |
| Tire Type | Mountain Bike (山地自行车) |
| Pressure Unit | PSI (pounds per square inch) |
| Preset Pressure Range | 15–45 PSI (target upper values per segment) |
| Inflation Segments | Sequential partial fills and full fills from 0 PSI or mid-range |
| Hold Duration for Post-Stop Reading | 10 seconds |
| Deviation Metrics Recorded | Stop pressure vs. preset (Accuracy Δ); 10 s hold pressure vs. preset (Retention Δ) |
| Ambient Conditions | Not separately recorded on this sheet; refer to lab standard conditions |
Test Procedure
- Pre-test: Confirm tire is at baseline pressure (0 PSI for fresh-fill runs, or at mid-point for continuation runs). Verify EV3 unit displays correctly and preset value is entered.
- Preset entry: Set the target inflation pressure (PSI) on the EV3 unit as listed in the "Preset Pressure" column.
- Inflation: Initiate inflation. The unit inflates from the recorded starting pressure to the preset target.
- Auto-stop reading: Record the actual pressure at the moment the unit auto-stops (Stop Pressure column).
- 10-second hold reading: Allow 10 seconds of static hold, then record the stabilized pressure (Stop 10 s Pressure column).
- Retention deviation calculation: Compute Δ Retention = (10 s pressure) − (Stop pressure). Negative values indicate pressure drop during hold.
- Accuracy deviation calculation: Compute Δ Accuracy = (10 s pressure) − (Preset pressure). This represents the final settled error vs. target.
- Post-test: Record any observations in the Remarks column. Proceed to next run segment.
- Acceptance criteria: All accuracy deviations must remain within ±1.0 PSI of preset across the full 0–45 PSI range for mountain bike applications.
Test Data & Results
| No. | Tire Type | Inflation Range (PSI) | Preset Pressure (PSI) | Stop Pressure (PSI) | Stop 10 s Pressure (PSI) | Retention Δ (PSI) | Accuracy Δ (PSI) | Remarks |
|---|---|---|---|---|---|---|---|---|
| 1 | Mountain Bike | 0–15 | 15 | 15.5 | 15.0 | −0.50 | 0.00 | |
| 2 | Mountain Bike | 15–45 | 45 | 45.2 | 44.8 | −0.40 | −0.20 | |
| 3 | Mountain Bike | 0–20 | 20 | 20.4 | 20.3 | −0.10 | +0.30 | |
| 4 | Mountain Bike | 20–45 | 45 | 45.2 | 44.6 | −0.60 | −0.40 | |
| 5 | Mountain Bike | 0–25 | 25 | 25.2 | 24.9 | −0.30 | −0.10 | |
| 6 | Mountain Bike | 25–45 | 45 | 45.2 | 44.8 | −0.40 | −0.20 | |
| 7 | Mountain Bike | 0–30 | 30 | 30.1 | 29.7 | −0.40 | −0.30 | |
| 8 | Mountain Bike | 30–45 | 45 | 45.2 | 45.0 | −0.20 | 0.00 | |
| 9 | Mountain Bike | 0–35 | 35 | 35.0 | 34.8 | −0.20 | −0.20 | |
| 10 | Mountain Bike | 35–45 | 45 | 45.5 | 45.1 | −0.40 | +0.10 |
All 10 runs recorded stop pressures within +0.5 PSI above preset. After the 10-second hold, all readings settled to within ±0.6 PSI of the preset target. Accuracy deviations (settled pressure vs. preset) ranged from −0.40 PSI to +0.30 PSI. The largest retention drop occurred on Run 4 (20–45 PSI segment, −0.60 PSI), consistent with higher-pressure segments where slight line relaxation is expected. No anomalies or remarks were recorded for any run.
Conclusion
| Item | Detail |
|---|---|
| Product | ETENWOLF EV3 Inflator — Unit EV3-5# |
| Test Scope | Mountain Bike precision inflation, 0–45 PSI, 10 segment runs |
| Standard / Criteria | Internal specification: accuracy deviation within ±1.0 PSI of preset |
| Worst-Case Retention Δ | −0.60 PSI (Run 4, 20–45 PSI) |
| Worst-Case Accuracy Δ | −0.40 PSI (Run 4, 20–45 PSI) |
| All Runs Within Tolerance | Yes |
| Verdict | PASS |
Document Information
| Role | Name | Details |
|---|---|---|
| Tester / Operator | BTK | Operator code recorded on test sheet |
| Author (Article) | Daniel Wright | daniel.wright |
| Source File | EV3充气泵-精度测试-2025.4.26.xlsx | Sheet: EV3-山地车-5 (Index 5, Sheet 6 of 8) |
| Test Date | 2025-04-08 | |
| Article Date | 2026-07-12 | |
| Product Reference | EV3-5# |
Frequently Asked Questions
What precision can the ETENWOLF EV3 inflator achieve when inflating mountain bike tires?
Across 10 test runs covering 0–45 PSI on mountain bike tires, the EV3 achieved final settled accuracy within ±0.40 PSI of the preset target. The unit consistently auto-stopped within +0.5 PSI of the preset and the pressure settled within ±0.60 PSI after a 10-second hold — well within the ±1.0 PSI internal tolerance.
Why does the EV3 stop slightly above the preset pressure before settling down?
This is normal behavior for automatic inflators. The pump stops when the sensor detects the preset threshold, but there is brief residual pressure in the hose and valve connection. Over 10 seconds, this equalizes with the tire volume, bringing the reading slightly closer to — or exactly at — the preset. All EV3 runs in this test settled to within 0.6 PSI of target after the 10-second hold.
Is the ETENWOLF EV3 suitable for the full 0–45 PSI mountain bike pressure range?
Yes. This test covered the complete mountain bike range from 0 PSI to 45 PSI through incremental segments (0–15, 15–45, 0–20, 20–45, 0–25, 25–45, 0–30, 30–45, 0–35, 35–45 PSI). The EV3 passed all 10 segments with accuracy deviations between −0.40 PSI and +0.30 PSI, confirming reliable performance across the entire range.
How does the mountain bike 5-series precision test differ from other EV3 test sheets?
The EV3-山地车-5 sheet (this report) focuses on mountain bike tires at a mid-level pressure series centered on 45 PSI upper targets. Companion sheets cover different tire types and pressure ranges: EV3-4# and EV3-5# and EV3-6# test standard valve configurations, EV3-山地车-4 and EV3-山地车-6 cover adjacent mountain bike series, and EV3-公路自行车-8 and EV3-公路自行车-9 cover road bicycle high-pressure ranges up to higher PSI targets.
Related Products
Explore other precision test reports from the same ETENWOLF EV3 test series:
- EV3-4# — Standard Valve Precision Test
- EV3-5# — Standard Valve Precision Test
- EV3-6# — Standard Valve Precision Test
- EV3 Mountain Bike 4-Series Precision Test
- EV3 Mountain Bike 6-Series Precision Test
- EV3 Road Bike 8-Series Precision Test
- EV3 Road Bike 9-Series Precision Test