ok basic basic..
offset = ET = how much the wheel fits under the arch.
BMWs run on a negative ET so the lower the number the further OUT the wheel sticks.
Around 37 - 42 is normal for a 8 inch deep wheel.
camber is how much the wheel is angled on the vertical
Negative camber means the bottom of the wheel stands further out than the top
Positive is the opposite.
The benifit of negative camber is, in a hard corner the wheel will come to level out and be +0- camber (hopefully) maintaining ballance. Too much positive camber and the car will begin to lean over the wheel and be unstable.
Staggered, is basically when there is a wider back wheel to from wheel. BMW supply some wheel types for the e36 that are staggered. Otherwise there are of course aftermarket options, but you have to be carefull of the OFFSET to make sure the wheel fits under the fenders otherwise its...
Fender rolling. This is where the inner edge of the arch is rolled up to release a few more millimeters space to accomodate wider wheels / tyres.
In some cases, the arches are bent outwards through the rolling process, even deliberately split open , and material welded in to achive a super wide look
But heres a few you didnt have
Bolt patteren.
The BMW % bolt pattern is 5 x 120 mm,
Hub Diameter.
Is 76,1 mm Ø for the majority of BMWs , Only the E34 uses a 74,6 mm Ø
Split rims.
Split rims consist generally of a wheel blank, and a bolt on hub at the front. These are known as 2 piece Splits. Some are available with a bolt on hub for the rear also, These are 3 ps.
The purpose of these were for racing, that the tyre size could be changed up or down to cover the condition. and are usually a lighter wheel than a solid cast wheel.
i cant think of any thing more
Getting New Wheels 101? 
Linear Mode
