I picked up a set of AMG monoblock II today, there in rough shape and will need refinishing. The tires on there are 235-45-17! Will those tires fit a 92 400E?

I used to have the same size tires on my 400E. They were fine when the car was at stock ride height. Once lowered, however, they were too large for the front and they rubbed. The rears were still okay. Obviously this all depends on the offset of your wheels-- mine are et35.

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'85 500SEL, 245,000 miles (sold)
'92 400E, 295,000 miles (donated)
'84 VW GTI (work in progress)
'10 VW GTI (daily)
'72 Chevy C10

225/45/17 is the same rolling diameter as stock and will work on a lowered car. 235 will work on a non-lowered car, as Legoisaniac stated.

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1991 300E - 212K and rising fast...

I run 235/45/17 on my non-lowered (yet) 300TE and it only rubs on large dips in the road, otherwise its rock solid.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k