hi :)
um
i have a graphics assignment about car rims
in one task i have been asked to research some stuff
i have done the other 7 questions in this topic
but i cant find anything with a clear outline on any of these few
any help would be most appreciated
thanks guys :)

what a "J type saftey rim" is

what "C-bore" is

what "+1 +2 fitment" is

anyone???

C - bore is the Centre Bore ie: the size of the hole in the centre of the rim (usually a standard size)

+1 etc... generally refers to the offest of the rim.

JJ is the width of the rim, not sure what j on its own is

cheers mate
so the cbore is the part where that little cover goes to go over the dust cap?
thanks heaps hey

google seems to have you sorted out..
http://mgaguru.com/mgtech/wheels/wl106.htm

ADR 20 - Safety Rims
The function of this Australian Design Rule is to specify wheel 'Rims' that will retain a deflated tyre in the event of a rapid loss of inflation pressure.

thanks :)
but im still abit unsure on +1 +2
all it says on my sheet is
+1 +2 fitment and beyond
so is this the amount of offset the rim has?

from the information given yes, http://www.rims-n-tires.com/rt_specs.jsp have a look here at how offset works. but without the actual context of the question that is the best i can do for you.

this is the full question

Part of the design process is to develop familiarity with the industry through gaining an understanding of the specific terminology used within the given industry. Your task is to provide an explanation of the following terms and how they apply to this project

* Offset
* Materials used/ manufacture methods used within the industry.
* 3, 4, 5, 6 stud design.
* Plus one and Plus two fitment (and beyond).
* Inches vs Centimeters (or millimetres).
*Benefits (positives) and detriments of larger wheel fitments.
* P.C.D
* C-bore
* J (or JJ) safety rim

"Plus one" describes where the rim diameter is increased by one inch, "Plus two" describes where the rim diameter in increased by two inches, and so on.

thanks :D