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GB/T 26650-2025Magnesium alloy castings for motorcycle and electric bicycle wheels (English PDF)

摩托车和电动自行车用镁合金车轮铸件

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 26650-2025 is the English-translated version of 摩托车和电动自行车用镁合金车轮铸件.

GB/T 26650-2025 is the Chinese national standard covering the same castings for two-wheelers — the alloys and the properties, the wall thickness and the soundness, the surface treatment against corrosion, and the fatigue and impact testing scaled to a wheel that carries a rider with no second axle to fall back on. It replaces GB/T 26650-2011, with the car wheel standard GB/T 26649-2025. In force from 1 March 2026. Issued on 29 August 2025, it has been in force since 1 March 2026, replacing GB/T 26650-2011.

Document preview — GB/T 26650-2025

National Standard of the People's Republic of China

ICS: 77.120.20
Classification: J 31
Replacing: GB/T 26650-2011

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope5
2 Normative References5
3 Terms and Definitions5
4 Technical Requirements5
5 Test Methods7
6 Inspection Rules7
7 Marking, Quality Certificate, Packaging, Transportation and Storage10

1 Scope

This document specifies the technical requirements, test methods, inspection rules, marking, quality certificate, packaging, transportation and storage of magnesium alloy wheel castings for motorcycles and electric bicycles.

This document applies to the manufacture of magnesium alloy wheel castings for motorcycles and electric bicycles (hereinafter referred to as the wheel castings).

2 Normative References

GB/T 228.1

GB/T 231.1

GB/T 5611

GB/T 6414-2017

GB/T 13748.21

GB/T 25747-2022

GB/T 39638

3 Terms and Definitions

The terms and definitions defined in GB/T 5611 are applicable to this document.

4 Technical Requirements

4.1 Chemical Composition

4.5 Surface Quality

4.5.1 The surface of the wheel castings shall be smooth and free of scabs, under-casting, cracks, porosity, holes, cold shuts and damage that may affect strength.

4.5.2 The tyre mounting surface and the area around the valve hole of the wheel castings shall be free of defects that may damage the outer or inner tube or affect valve function.

4.5.3 The rim area of tubeless wheel castings shall be free of holes, slag inclusions or cracks that may affect air-tightness.

4.5.4 Casting defects within the machining allowances are permitted on the wheel castings.

5 Test Methods

5.1 Chemical Composition

The inspection method for chemical composition shall be in accordance with the provisions of GB/T 13748.21.

5.2 Mechanical Properties

5.2.1 The tensile test method shall be in accordance with the provisions of GB/T 228.1.

5.2.2 The hardness test method shall be in accordance with the provisions of GB/T 231.1.

5.3 Dimensional and Geometrical Tolerances

The dimensional and geometrical tolerances of the wheel castings shall be inspected using testing tools that meet precision requirements.

5.4 Internal Quality

Internal defects of the wheel castings shall be inspected by non-destructive X-ray testing, and the inspection method shall be in accordance with the provisions of GB/T 39638.

5.5 Surface Quality

The surface quality of the wheel castings shall be visually inspected.

6 Inspection Rules

6.1 Batch Grouping

Castings of the same designation, produced on the same casting machine, using the same mold, and produced continuously in the same shift are considered a batch. Special batch grouping shall be determined by agreement between the supply-side and the demand-side.

6.2 Inspection Items

Inspection is classified into exit-factory inspection and type inspection. The inspection items for exit-factory inspection and type inspection are shown in Table 4.

6.3 Sampling

See Table 5 for the provisions for the sampling of the wheel castings. ......

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 6414-2017

Editions of GB/T 26650

Edition	Title	Revision	Status
GB/T 26650-2025	Magnesium alloy castings for motorcycle and electric bicycle wheels	current edition	Current
GB/T 26650-2011	Magnesium alloy castings for electric bicycle and motorcycle wheels	previous edition	In force

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