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Different drum sizes

Hilljack68

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My fender tag is long gone, so I don't know what size drums I have. So, where do I measure to verify?... I'm assuming the inside diameter of the drum, where the shoes contact the drum. Thanks.


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ID with a tape measure. If the drums are smooth, they 9" brakes, if the drums are finned/ribbed, they are 10" brakes.Apr 25, 2016
 
ID with a tape measure. If the drums are smooth, they 9" brakes, if the drums are finned/ribbed, they are 10" brakes.Apr 25, 2016

I've never seen a 9" brake on a B body... And 10" drums are smooth... 11" drums are finned starting in 71, 70 & earlier are smooth...
 
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