81 126 300SD Wheel size/offset Confusion

[scott2go]

Hello All,
After much searching I thought I had a handle on offset/sizing but I guess not
My 81300sd has Centra style wheels on it now,1 bad
that it needs replaced,Problem being only Ronal,and Performance Parts carry the wheel and it's chrome,I want polished for $300+ .Here is my Dilema
The Centra's Are sized @
7Jx15H2
ET 23
Tires 205/65/15

The Extra set of original Bundts,I have are in awful condition and are sized @
6JX14H2
ET 30

Does the offset change w/ wheel diam.?
Say I want to Run 15,16,17,or18 inch wheels,Does the offset required to mount w/out spacers change w/ diam.& width??I cant afford new so I have been shopping for take offs,Can someone please fill me in on what rims from which cars will fit my 126,81300sd???PLEASE!!!!! Chrome or alloy...


I found a brand new set of 18s w/ 500mi. for $450 off of an S or CLK sized @
8.5J X 18 H2
ET 35,
W/ 225/40/18 tires
The owner says they will fit,but just from looking I cant see how,I hadn't found a post to help me out so I thought I would ask you guys.I just can't afford the money some shops are asking,I would love to but cant make it happen .Any help would be great.Im in Arizona

[Luke@tirerack]

the wheels will fit fine but the tires are too short and do not have the proper load capacity .......

[scott2go]

Anyone else.. know of a post that would answer my questions???

will the lugs work or will I need longer ones??What size tires would you suggest??Can you suggest any other take off's from other cars that would be better.,and work w/out spacers.15,16,17 or 18 works for me.Im lookin" for a deal any help would be great.Thanks again"