R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

Biggest tire size for R class?

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Old 04-09-2012, 08:52 PM
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2008 R320 CDI, 2006 smart fortwo cabrio, 1983 240D, 1982 300SD, 1980 300SD
Biggest tire size for R class?

I am looking up upgrading the wheels on our 2008 R320, anyone know what will fit? I am sticking with factory wheels and looking at takeoffs, no tirerack junk thanks. Will the GL 20" wheel/tire combo fit 275/45/20 fit? It has 50 something offest instead of 60 for the same size.
Old 04-11-2012, 12:33 AM
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W124, W203, W204, W251
I don't see why it won't fit.
Old 04-11-2012, 12:50 PM
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R350 | X1 | Cayenne
Originally Posted by houseofdiesel
I am looking up upgrading the wheels on our 2008 R320, anyone know what will fit? I am sticking with factory wheels and looking at takeoffs, no tirerack junk thanks. Will the GL 20" wheel/tire combo fit 275/45/20 fit? It has 50 something offest instead of 60 for the same size.
I believe it will fit. However, the total diameter for the new wheel will be bigger than OEM. I ran the numbers on an online tire calculator. With your new tire size, the speedometer will show 58.5 mph although you're driving @ 60 mph. The OEM 20" tire size for the R Class is 265/45/20.
Old 04-11-2012, 08:51 PM
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2008 R320 CDI, 2006 smart fortwo cabrio, 1983 240D, 1982 300SD, 1980 300SD
Sorry the size on the GL is 275/50/20, which is two + sizes. The speedo error is not a concern we don't drive fast ever and have a scanguage which has speedo correction if needed. I am concerned with actual fender/strut or air spring clearance.

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