Welcome to the forums.
There are some Revel owners here
16 & 17 are the rim size
the first number is the WIDTH of the tread the second is a percentage of the width applied to the sidewall HEIGHT
so a "200/50" would be 200 mm wide and 100 mm high
the 235/75/16 on my pickup would be 235mm wide tread and a sidewall 176mm high ( 75%)
often with a larger rim, a shorter sidewall tire will be spec'd- ( and a shorter sidewall would have less flex, which may be better for a heavyweight)
The 17" rim may also have other attributes such as offset or even to fit larger brakes or some other change from stock MB ( but I dunno)
Side by side, the 2 wheels 16/17 with tires may be the same total height/diameter. that way the speedo is accurate as are the gear ratios in the tranny
Mike
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