Contour Enthusiasts Group Archives Forums Modifications Wheels & Tires What is Correct Size for Hubcentric Ring?

Here's what I purchased for my Cetnerline Impulse 445 wheels.
(HR72-6336) HR72-6336 Outside Dia. 72.62mm/2.859

That is a 63.36mm inside diameter, 72.62mm outside diameter. The outside diameter is specific to the wheel that you are purchasing.