brake drum diameter
If I remember correctly drums up to 13"diameter can be machined up to .060" larger than the original size. Drums over 13" can be machined up to .090". For safety inspection purposes drums will pass up to .090" for up to 13" and up to .120" for over 13" diameter. This is to allow up to .030" for wear after the maximum machine diameter. This is provided if manufacturer's specs are not available and you know the original drum diameter.
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