[W126 Coupe] SEC Wheel Spreadsheet

[Vance Rowley]

Hi Axel,

 Looks good to me. The only difference seems to be with the overall standard wheel diameter between the US and Euro versions, not that there is any significant difference anyway to worry about any speedo re-calibration. The other thing is as far as the tire width is concerned and what wheel width they will fit onto. This data is different per manufacturer and model of tire. A good source for this info is the tirerack website. I only have the standard 15" X 7.5" wheels on my Euro 560, but I have the 225 width tires on the rear. The particular tires I have (before I chose them) I looked up on the tirerack website to see from what minimum to what maximum width wheels these would fit onto. The 7.5" was the minimum width of the range, but clearly specified by the manufacturer. You probably knew this already, as I noticed on your spreadsheet that you also have 225's on 7.5" width wheels. Only difference is you have the 16" wheels.

Good work,

Vance.

----- Original Message ----- 
From: "Axel Wulff" <axelwulff at hotmail.com>
To: <mbcoupes at mbcoupes.com>
Sent: Thursday, April 06, 2006 9:02 PM
Subject: [W126 Coupe] SEC Wheel Spreadsheet


>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
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