Welcome - we'd love to see pictures of all the vehicles in your signature because it includes some models we can't get here.

The main reason I like the 15" wheels is for looks. The later 15-hole MB wheels look better on the W123 and W126 than the older 14" Bundt cake pan wheels that were original.

The secondary reason is that tire selection is a little better in the 15" size than the 14" size. But not really that much better.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles