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See Chinese contents: GB/T 521-2023 GB/T 521-2023: Test methods for measuring peripheral dimensions of tyres
This document describes the measurement methods for peripheral dimensions of pneumatic tyres (cover tyre, inner tube and pad belt), including measurement tools and their accuracy requirements, measurement conditions, measurement methods, data calculation and processing, and test reports. This document is applicable to passenger car tyres, truck tyres, agricultural tyres, engineering machinery tyres, industrial vehicle pneumatic tyres, motorcycle tyres, electric bicycle tyres and cycle tyres.
