Originally Posted by
randyjawa
Sometimes, threading information will be indicated on the hub, behind the freewheel. Sometimes, the information will be indicated on the freewheel, itself. And sometimes you get to guess and/or measure before you will know what you have.
If there is another way to figure this out, I would also be interested.
An English thread bottom bracket lockring will thread onto an English thread hub, but not a metric hub, and an English thread adjustable cup will thread into an English thread freewheel, but not a metric freewheel.