I couldn't find any info on resurfacing drums other than they are 16 inch diameter and a 3 inch wide drum. Maybe edb might have something.
The 212 probably predates regulatory involvement in brake drums. I have never seen anything relating to max diameter in any of the books that I have. Some older drums have a mark on the edge for the max diameter.
Hi Team,
from The Dealer this is the only chart I have, but I feel the 3mm/0.125" Max. above Standard cited here would be acceptable for your 212.
The sizes given on the chart are the specification standard size for that P/No.
So The max size is that given dimension +0.125"/3mm
I do not have a P/No for your drums or a Standard size, maybe some one else can help further.
Hope this helps.
Cheers,
Eddie B.
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