ETENWOLF S0 Portable Bike Pump Precision Test Report — Sample 3 (Road Bike & Mountain Bike)

Document Overview

Key Findings The ETENWOLF S0 Sample 3 unit completed a full pressure accuracy test across both road bike and mountain bike tire profiles on 2025-07-03, with all auto-stop readings within ±1.1 PSI of the preset target and pressure retention deltas within ±0.5 PSI across all…

Document type
Test Report
Prepared by
Daniel Wright
Published
Last reviewed
Topics
Motor Performance

Key Findings

The ETENWOLF S0 Sample 3 unit completed a full pressure accuracy test across both road bike and mountain bike tire profiles on 2025-07-03, with all auto-stop readings within ±1.1 PSI of the preset target and pressure retention deltas within ±0.5 PSI across all 49 test runs.

  • Product: ETENWOLF S0 Portable Bike Pump (Sample 3 — S0-3#)
  • Test Date: 2025-07-03
  • Tire Types: Road Bike (公路自行车) — 38 runs; Mountain Bike (山地自行车) — 11 runs
  • Preset Pressure Range Tested: 15 PSI to 110 PSI (road); 15 PSI to 60 PSI (mountain)
  • Maximum Accuracy Deviation: +0.9 PSI (Road Bike, Run 30, preset 110 PSI)
  • Maximum Retention Loss (10 s): −0.5 PSI (Road Bike, Runs 22, 27, 31)
  • Overall Verdict: PASS — all deviations within acceptable tolerance

Test Overview

Item Detail
Test Type Pressure Accuracy & Auto-Stop Precision
Report / Sheet S0-3#-自行车-山地车 (Sheet 7 of 7)
Source File S0 充气泵-精度测试-2025.7.3.xlsx
Test Date 2025-07-03
Product ETENWOLF S0 Portable Bike Pump
Product Code S0-3#
Product Line Inflation Tools
Sample Identifier Sample 3 (S0-3#)
Tire Types Covered Road Bike (公路自行车), Mountain Bike (山地自行车)
Tester Initials BTK
Total Data Rows 49 (38 road bike + 11 mountain bike)

Test Equipment & Setup

Parameter Value
Unit Under Test ETENWOLF S0 Portable Bike Pump, Sample 3 (S0-3#)
Pressure Unit PSI
Measurement Points Auto-stop pressure (PSI); pressure after 10-second hold (PSI)
Derived Metrics Retention delta = Stop 10 s − Stop pressure; Accuracy delta = Stop 10 s − Preset pressure
Road Bike Preset Range 15 PSI – 110 PSI
Mountain Bike Preset Range 15 PSI – 60 PSI
Starting Conditions Various incremental starting pressures as specified per run (e.g., 0 PSI, 15 PSI, 30 PSI, etc.)
Post-stop Measurement Delay 10 seconds

Test Procedure

  1. Pre-test: Confirm the S0-3# unit is fully charged and in factory condition. Record ambient conditions. Mount the pump to the target tire type (road bike or mountain bike) and deflate to the specified starting pressure.
  2. Preset entry: Set the target auto-stop pressure on the S0 unit as specified in the test run (e.g., 15, 20, 25 … 110 PSI for road bike; 15, 20, 25 … 60 PSI for mountain bike).
  3. Inflation: Activate the pump and allow it to run to auto-stop. Record the pressure displayed at the moment of auto-stop as the Stop Pressure.
  4. 10-second hold: Wait 10 seconds without disconnecting the hose. Record the displayed pressure as Stop 10 s Pressure.
  5. Delta calculation: Calculate Retention Delta (Stop 10 s − Stop Pressure) and Accuracy Delta (Stop 10 s − Preset Pressure).
  6. Repeat: Repeat for all specified pressure ranges, both from 0 PSI and from intermediate starting pressures, covering all 38 road bike runs and 11 mountain bike runs.
  7. Post-test: Inspect the unit for any abnormality. Record all data in the test sheet.
  8. Acceptance criteria: All accuracy deltas must fall within the product specification tolerance (±1.5 PSI or per internal standard); retention delta must indicate no abnormal pressure loss.

Test Data & Results

Road Bike (公路自行车) — 38 Runs

# Tire Type Inflation Range (PSI) Preset (PSI) Stop Pressure (PSI) Stop 10 s (PSI) Retention Delta (PSI) Accuracy Delta (PSI) Remarks
1 Road Bike 0–15 15 15.6 15.4 −0.20 0.40
2 Road Bike 15–110 110 110.6 110.3 −0.30 0.30
3 Road Bike 0–20 20 20.7 20.5 −0.20 0.50
4 Road Bike 20–110 110 110.9 110.6 −0.30 0.60
5 Road Bike 0–25 25 25.3 25.0 −0.30 0.00
6 Road Bike 25–110 110 110.7 110.4 −0.30 0.40
7 Road Bike 0–30 30 30.5 30.2 −0.30 0.20
8 Road Bike 30–110 110 110.8 110.4 −0.40 0.40
9 Road Bike 0–35 35 35.7 35.4 −0.30 0.40
10 Road Bike 35–110 110 110.5 110.2 −0.30 0.20
11 Road Bike 0–40 40 40.8 40.6 −0.20 0.60
12 Road Bike 40–110 110 110.6 110.2 −0.40 0.20
13 Road Bike 0–45 45 45.4 45.0 −0.40 0.00
14 Road Bike 45–110 110 110.6 110.4 −0.20 0.40
15 Road Bike 0–50 50 50.4 50.2 −0.20 0.20
16 Road Bike 50–110 110 110.9 110.5 −0.40 0.50
17 Road Bike 0–55 55 55.8 55.4 −0.40 0.40
18 Road Bike 55–110 110 110.6 110.2 −0.40 0.20
19 Road Bike 0–60 60 61.0 60.7 −0.30 0.70
20 Road Bike 60–110 110 110.5 110.2 −0.30 0.20
21 Road Bike 0–70 70 70.9 70.5 −0.40 0.50
22 Road Bike 70–110 110 111.0 110.5 −0.50 0.50
23 Road Bike 0–85 85 86.1 85.7 −0.40 0.70
24 Road Bike 85–110 110 111.1 110.7 −0.40 0.70
25 Road Bike 0–90 90 90.8 90.4 −0.40 0.40
26 Road Bike 90–110 110 110.8 110.4 −0.40 0.40
27 Road Bike 0–95 95 96.0 95.5 −0.50 0.50
28 Road Bike 95–110 110 110.7 110.4 −0.30 0.40
29 Road Bike 0–100 100 100.3 99.9 −0.40 −0.10
30 Road Bike 100–110 110 111.3 110.9 −0.40 0.90
31 Road Bike 0–105 105 106.0 105.5 −0.50 0.50
32 Road Bike 105–110 110 111.0 110.7 −0.30 0.70
33 Road Bike 0–110 110 110.8 110.5 −0.30 0.50
34 Road Bike 0–60 60 60.8 60.4 −0.40 0.40
35 Road Bike 60–70 70 70.9 70.6 −0.30 0.60
36 Road Bike 70–80 80 81.1 80.8 −0.30 0.80
37 Road Bike 80–90 90 90.9 90.5 −0.40 0.50
38 Road Bike 90–100 100 100.8 100.5 −0.30 0.50

Mountain Bike (山地自行车) — 11 Runs

# Tire Type Inflation Range (PSI) Preset (PSI) Stop Pressure (PSI) Stop 10 s (PSI) Retention Delta (PSI) Accuracy Delta (PSI) Remarks
1 Mountain Bike 0–15 15 15.3 15.2 −0.10 0.20
2 Mountain Bike 15–20 20 20.4 20.3 −0.10 0.30
3 Mountain Bike 20–25 25 25.2 25.1 −0.10 0.10
4 Mountain Bike 25–30 30 30.0 29.8 −0.20 −0.20
5 Mountain Bike 30–35 35 35.2 35.0 −0.20 0.00
6 Mountain Bike 35–40 40 40.2 40.0 −0.20 0.00
7 Mountain Bike 40–45 45 45.3 45.1 −0.20 0.10
8 Mountain Bike 45–50 50 49.9 49.7 −0.20 −0.30
9 Mountain Bike 50–55 55 55.1 54.9 −0.20 −0.10
10 Mountain Bike 55–60 60 60.4 60.1 −0.30 0.10
11 Mountain Bike 0–60 60 60.3 60.1 −0.20 0.10

Observations: All 49 runs recorded auto-stop pressures above the preset value (overshoot range: 0.0 to +1.3 PSI), consistent with normal auto-stop behavior. The 10-second retention delta was negative in all cases, indicating minor pressure bleed-back through the valve connection, which is expected and within specification. The largest accuracy deviation was +0.90 PSI at Run 30 (road bike, 100–110 PSI). Mountain bike results showed tighter accuracy deltas overall (max ±0.30 PSI), which is consistent with the lower pressure range tested. No anomalies or failures were recorded.

Conclusion

Item Detail
Product ETENWOLF S0 Portable Bike Pump (S0-3#)
Test Scope Pressure accuracy and auto-stop precision — road bike and mountain bike modes
Preset Range Covered 15–110 PSI (road bike); 15–60 PSI (mountain bike)
Total Runs 49 (38 road + 11 mountain)
Max Accuracy Delta +0.90 PSI (Run 30, road bike, 100–110 PSI segment)
Max Retention Delta −0.50 PSI (Runs 22, 27, 31 — road bike at 110 PSI)
Mountain Bike Max Accuracy Delta −0.30 PSI (Run 8, 45–50 PSI segment)
Standard / Tolerance Internal precision specification (±1.5 PSI or per product standard)
Verdict PASS — All readings within acceptable tolerance across all tested conditions

Document Information

Role Name Initials / Code
Tester BTK BTK
Source File S0 充气泵-精度测试-2025.7.3.xlsx
Sheet Name S0-3#-自行车-山地车
Sheet Index 7 of 7
Test Date 2025-07-03
Article Published 2026-07-12
Author Daniel Wright

Frequently Asked Questions

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

Across 38 road bike test runs covering presets from 15 PSI to 110 PSI, the S0 Sample 3 unit recorded accuracy deltas between −0.10 PSI and +0.90 PSI after a 10-second hold. The pump consistently stopped within 1.3 PSI of the target, well within the ±1.5 PSI tolerance standard.

How much pressure does the S0 lose in the 10 seconds after auto-stop?

In all 49 test runs the retention delta (pressure change in the 10 seconds following auto-stop) was between 0.00 PSI and −0.50 PSI. This minor bleed-back is normal and results from pressure equalization through the valve when the hose is still connected. It does not indicate a defect.

Does the ETENWOLF S0 perform differently on mountain bike tires versus road bike tires?

Yes, slightly. Mountain bike results (15–60 PSI range) showed tighter accuracy deltas, with a maximum deviation of ±0.30 PSI. Road bike results at higher pressures (up to 110 PSI) showed slightly larger deltas (max +0.90 PSI), which is consistent with the increased mechanical load at higher pressures. Both profiles passed the acceptance criteria.

Which sample number is covered in this report?

This report covers Sample 3 (product code S0-3#). Precision test data for Samples 1 and 2 are available in the sibling test sheets: S0-1#-自行车-山地车 and S0-2#自行车-山地车.

Related Products & Reports

Explore the full ETENWOLF S0 precision test series or view the product page:

Sibling test sheets from the same Excel workbook (S0 充气泵-精度测试-2025.7.3.xlsx):

  • S0-1#-蓝球 — Sample 1, Basketball Precision Test
  • S0-1#-自行车-山地车 — Sample 1, Road Bike & Mountain Bike Precision Test
  • S0-2#-蓝球 — Sample 2, Basketball Precision Test
  • S0-2#自行车-山地车 — Sample 2, Road Bike & Mountain Bike Precision Test
  • S0-3#-蓝球 — Sample 3, Basketball Precision Test
  • S0-3#-自行车-山地车 — Current report — Sample 3, Road Bike & Mountain Bike Precision Test