[W126 Coupe] SEC Wheel Spreadsheet

[Axel Wulff]

I put together the attached spreadsheet mostly for my own education, but I 
thought it could be useful for others and it would be nice if you all could 
do a quality control to check my data.

The first tab in the spreadsheet provides for an easy way to calculate how 
much the wheel diameter will increase/decrease from stock with various sizes 
of rims and tires. I.e.; the standard wheel, 15" rim with 205/65 tires, is 
64.8 cm in diameter, if you go to a 17" rim with a 275 tire, a sidewall 
profile of 45 will get you the closest to stock with an overall diameter of 
65.2 cm.

The second tab deals with the width of the tires vs. the width of the rims 
and is just a sanity check for what tires will fit on any given rim width. 
The idea is that you should not try to put too wide a tire on a narrow rim 
and you would not use a tire that is narrower than your rims (unless you are 
a low-rider - they do strange things with wheels..).

The third tab deals with the offset (ET = einpresstiefe) issue. In order not 
to complicate things,  I left out the any rim consideration. The idea is 
that with a reasonable rim/tire selection (see tab 2), the widest part of 
the wheel is going to be the tire. There may be other reasons for including 
the rim width, especially in the front, but I am not aware of them.

I put my sets of wheels in the spreadsheets.


Regards,
Axel J. Wulff
610-731-5453 Cellular
610-572-4611 Home

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