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OFFSET
The
offset of a wheel is the measurement of the hub surface contact area in
offset from the center line of the overall rim width of the wheel.
A wheel whose hub surface contact area sits further towards the
outside of the wheel than the center line has a positive offset. A wheel
whose hub surface contact area sits further towards the inside of the
wheel than the centerline has a negative offset
To
determine the offset, the wheel must be measured accurately using the
following steps:
(1)
measure the overall rim width of the wheel.
(2)
measure the T dimension (Backspace), which is the measurement
from the hub surface contact area to the outside of the inner rim.
(3)
divide the overall rim width by 2 which gives you the center
line.
(4)
subtract the center line (overall rim width/2) from the T
dimension (Backspace).
(5)
a negative answer means the wheel has a negative offset and a
positive answer means the wheel has a positive offset
PCD
The Pitch
Circle Diameter is the diameter of the circumference of the center line
of the lug nut holes, this can be four, five or six lug.
The easiest way of measuring four or six lug wheels is take the
diagonal holes and measure from the outer edge of one hole to the inner
edge of the second hole. With
five lug wheels this is not possible as there are not diagonal holes,
therefore the simplified way would be to measure the outer circumference
and inner circumference of the holes.
The difference should be divided by two and added onto the
smaller circumference or deducted from the larger circumference.
CENTER
BORE
The
center bore is the location hole machined in the center of the wheel and
this varies from one vehicle to another.
It is essential the wheels purchased have the correct center bore
for the vehicle they are to suit, otherwise you may experience balancing
problems.
CALIPER
CLEARANCE
Some
vehicles as standard are produced using large brake calipers,
therefore our listings have taken this into account when advising
fitments. You should advise your wheel supplier
if you have modified the brakes on
your
vehicle. |
