The center bore or hub diameter of a rim speaks for itself, it's the size of the center hole in the middle of the rim. This value is expressed in millimeters.
It is not allowed to take over data without mentioning the source, Wheel-fitment.com.
Copyright (c) 2009-2018 Wheel-fitment.com. All rights reserved.
Wheel-fitment.com is not responsible for the consequences of any (type) errors on this site.