What size is hole in center of front rim

Arco440 said

Bore size? are you referring to the hub?Or the piston bore? cylinder bore?a little more info please it may help you find an answer .

Click to expand...

Referring to the hub. I am looking to determine what size the center hole in the rim needs to be to fit over the hub on a 72 duster with disc brakes. Hope this clarifies. Thanks.