Permalink Reply by Gabby Olson on April 21, 2012 at 11:47pm 
ID doesn't really matter. The closer the ID is to the OD number the thinner the walls will be. I have never had to think about ID when purchasing polypro. Who are you ordering from?
Permalink Reply by Randy Kato on April 23, 2012 at 10:50am Are you ordering a hoop or tubing to make a hoop? The 5/8" OD is referring to the size of the tubing.
It sounds like you're asking about the size/diameter of the hoop itself... that's usually measured as the outer diameter (OD), but some companies like Astral Hoops measure inner diameter (ID). The difference depends on the size/OD of the tubing. So for example, a 36" OD hoop made of 1" OD tubing, is going to have an ID of 34".

ID refers to the wall thickness of the tubing, not necessarily the diameter of the hoop itself.
Permalink Reply by Gabby Olson on April 23, 2012 at 1:45pm 
Are you ordering from someone specific or are you just doing research?
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