Seat tube measurement for clamp?

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I need to buy a clamp for a 3-speed pully that will attach to the seat tube. Between 1", and 1-1/8", if I measure the outside diameter of the seat tube, is that precise enough? I'm assuming that's where those sizes are referring. I just want to make sure before I order.
 
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And those are the two available sizes. 1 and 1 & 1/8".
1" is common on old ef Schwinns and USA made bikes.
1 & 1/8" is common on lugged frames.
 

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