GB/T 5373-2019Measuring method of dimensions and masses parameter for motorcycles and mopeds (English PDF)

GB/T 5373-2019 is the English-translated version of 摩托车和轻便摩托车尺寸和质量参数的测定方法.

GB/T 5373-2019 specifies the measuring conditions, the measuring methods and the value taking rules for the dimensions and masses parameters of motorcycles and mopeds.

Clause 1 states that it is applicable to motorcycles and mopeds, called the vehicle in the text.

The standard runs Scope, Normative references, Terms and definitions, Basic measuring requirements, Measurement of dimensions parameter, Measurement of mass parameters and Measurement results and value rules for measurement data, and ends with three informative annexes holding the recording tables for vehicle size parameter measurement, vehicle mass parameter measurement and vehicle centroid height.

Clause 3 defines the wheel center, optional parts, standard parts, the attachment, which plays an auxiliary role but does not affect the normal driving of the motorcycle once removed, and the axle load specific value, the ratio of each wheel axle load to the curb weight of the whole vehicle.

The basic measuring requirements have the vehicle clean and completely equipped with tyre pressures in accordance with the product technical documents, resting upright on the supporting plane with the wheels in a straight running line, the wind shield in the working position and the doors and windows of a right three-wheeled motorcycle closed, and they list the measuring instruments with their scale intervals: a steel tape to 1 mm, an angle meter to 5 minutes, a height ruler to 0.5 mm, a heavy hammer or square, a three-dimensional coordinate measuring device and scales, electronic scales or a vehicle load meter to 0.2 kg.

The mass clause fixes the total mass of the driver and his equipment at 75 kg, with a counterweight added at the corresponding seating position when it is less, keeps the gearbox in neutral with the brakes unused, allows dummies fixed as one with the vehicle in place of the driver and occupant when the centre of mass position is determined at the factory-defined maximum total mass, prescribes the posture of the driver and the occupant, and weighs the distributed mass of each wheel on two or three scales to obtain the vehicle dry mass, the vehicle curb weight and the factory-specified maximum total mass from formulas 3 and 4.

The final clause has the size, mass and centroid height results entered in the record forms of the three annexes and ties the effective values of measured and calculated data to Table 6; the preview breaks off in that clause.

Clause 2 cites GB/T 3730.3, GB/T 5359.1, GB/T 5359.3, GB/T 5359.4 and GB/T 8170, and clause 3 applies the terms and definitions of the first four of those along with its own.

It replaces GB/T 5373-2006, was issued on 10 December 2019 and has applied since 1 July 2020.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 34 pages — is available in the English PDF.

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