[W126 Coupe] Wheels & Tires

[Mike R.]

A primary reason to maintain the same diameter rim/tire combination is to
keep the speedometer calibrated. Minor variations (e.g., 4.5%) won't make
much difference in performance. That said, I added a Dakota Digital SGI-5
universal speedometer adapter to my SEC when I put in a 3.07:1 differential
in place of the stock 2.47:1 unit. It took fifteen minutes to install it,
then another half hour to calibrate it to the GPS device I had handy. Which
all boils down to: don't worry about tire sizes. Get something that looks
good and doesn't rub anywhere, then you can adjust the speedometer yourself,
if required. The SGI-5 is only $80, probably less than a professional
speedometer calibration would cost.

 

Do all SECs have electronic speedometers or were some of the early ones
mechanical?

 

Later,

Mike R.

(702) 494-8056

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Axel Wulff
Sent: Tuesday, January 30, 2007 1:15 PM
To: mbcoupes at mbcoupes.com
Subject: Re: [W126 Coupe] Wheels & Tires

 

Bob,

The correct tire in 16", 225 width is a 55 profile. The same tire in a 60
profile will result in a wheel that is 67.6 cm in diameter, or about 4.5%
larger than standard (15", 205/65 = 64.8 cm).

Most experts opinions that I have seen discourages changing the overall
wheel diameter by more than 4%.

I used to have 16" wheels with 225/55 tires and they fit the car very well
(1990 560 SEC). Better performance than stock with no harshness or other
ride issues.

Now I use 17" rims with 245/45 up front and 275/40 at the rear and the 16"
were a better comfort/performance compromise. The 17" lean more towards
performance.




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

  _____  

From: "Bob Rodgers" <bobrod at cox.net>
Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
To: <mbcoupes at mbcoupes.com>
Subject: [W126 Coupe] Wheels & Tires
Date: Tue, 30 Jan 2007 15:17:35 -0500

I'm bidding on 16" wheels from one guy and tires from another.  Can I use
225-60R-16" tires on my 1983 380 SEC?  I'm presently running on 205-65R-15".
What's the difference and how will it effect my car.???

Thanks guys.

Bob Rodgers

1982 380 SL Drive it on nice sunny days.

1983 380 SEC  Every day driver

1987 560 SL Starting to restore

1973 450 SL  Parts car.

 


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