TÜVSÜDTestPassed.
Independent fatigue testing by TÜV SÜD Product Service GmbH (Garching, Germany). Hybrid carbon-fiber wheel construction verified to 650 kg load capacity — 7,500 km biaxial fatigue test completed without cracks.
This is a laboratory fatigue test report. It is not TÜV certification, type approval, or a permit application document.
Report Information
- Testing Laboratory
- TÜV SÜD Product Service GmbH, Garching, Germany
- Report Number
- 713265924-00
- Test Date
- 25.07.2022 – 11.08.2022
- Wheel Construction
- Fiber composite rim with light alloy star, screwed by 10 connecting screws
- Item Number
- NCV 20_1.51
- Wheel Size
- 9J × 20 H2, Offset 40
- Permitted Wheel Load
- 650 kg
- Tire Size
- 245/35 ZR20
- Wheel Weight
- 9.2 kg
- Test Standard
- Material-specific appendix (27.10.2020) to BMV/StV 13/36.25.07-20.01 (25.11.1998)
Biaxial fatigue distance
Without Cracks
Wheel bolts unobtrusive
Tests Performed
Testing conducted per the material-specific appendix (27.10.2020) to the German guideline for testing special wheels for motor vehicles (BMV/StV 13/36.25.07-20.01).
Stiffness Measurement
Radial measurements at tire seat inside and axial at spokes offset by 90°. Up to 4 tests per position; arithmetic mean values recorded. Measured in as-delivered condition, after preconditioning, after rotating bending, and after biaxial test.
Radial Impact Test
Performed between 2 spokes, opposite the valve hole, simulating passage of a pothole or obstacle. Wheel load factor: 1.15, tire inflation pressure: 2.0 bar.
10× Tire Mounting
Tire dimension 245/35 R20 mounted and dismounted 10 times to verify bead seat integrity under repeated service conditions.
Thermal Pre-damage
Radial test with 245/35 R20 tire mounted, inflation pressure 2.0 bar. 10 heating/cooling runs to simulate brake heat soak and thermal cycling stress on the composite-metal bondline.
Biaxial Wheel Testing
Synthetic circuit derived from European operating conditions: straight driving on bad roads and motorways, plus sharp right and left curves. Tested on ZF1 outer drum test rig with Bridgestone Potenza 245/35 R20.
§4.5 Biaxial Wheel Testing Parameters
Synthetic circuit derived from European operating conditions — straight driving on bad roads and motorways, plus sharp right and left curves.
| Parameter | Value |
|---|---|
| Test Bench | ZF1 outer drum test rig |
| Tire | Bridgestone Potenza 245/35 R20 |
| Inflation Pressure | 4.5 bar |
| Static Wheel Load | 650 kg |
| Bolt Torque | 120 Nm |
| Test Speed | 105 km/h |
| Target Distance | 7,500 km |
| Achieved Distance | 7,500 km |
| Visual Inspection | Without cracks |
| Wheel Bolts | Unobtrusive |
Full Laboratory Report
Report #713265924-00 · TÜV SÜD Product Service GmbH · 5 pages + annexes
Test Conclusion
“The hybrid wheel construction of the size 9J × 20 H2 offset 40 partially meets the strength requirements of the material-specific appendix, status 27.10.2020, to the guideline for the testing of special wheels for motor vehicles and their trailers.”
Max. wheel load capacity of 650 kg was positively verified in the tests carried out. The biaxial fatigue test achieved the full target distance of 7,500 km with visual inspection result: without cracks.
Versuchsdurchführung: Thomas Tallafuss · Bericht geprüft: Daniel Tinhof · Garching, 11.08.2022. This Laboratory Report with the Annexes comprises 16 pages.
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