Found this definition/article on some site. Now I know why my Cragers
aren't easy to keep vibration free...they're lugcentric.
Mark L.
Hub Bore Hub bore is the diameter of the central hole in your wheels. This
hole fits over the central projection on your hub. Since the wheel is centered
on the hub it is called hubcentric. Since manufacturers use different hub
bores aftermarket wheel manufactuers usually do one of two things. Both
involve
making the hub bore relatively large. In the first case the wheel
manufacturer makes the hub bore large, so it fits a variety of cars, then
supplies
Hubcentric rings, that fit inside the bore and adapt it down to the size of
the
hub projection on various cars. This way they can make/stock 25 different
hubcentric rings instead of 25 different wheels. The "one size fits all"
wheel,
plus the correct ring, makes the wheels hubcentric for a specific car. The
other option is to leave the hub bore large, and not supply rings. In this
case
the wheel becomes Lugcentric because the wheel is not centered on the hub,
but instead the lug nuts/bolts. Lugcentric wheels are much harder to center
than hubcentric wheels due to the fact that it is not centered on a central
projection. For this reason lugcentric wheels are more prone to vibration and
shimmys at speed, if mounted correctly however, lugcentric wheels can be
trouble
free.
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