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Use a tire size calculator for diameter. +/- 2% is usually OK. What car did your uncle have? Since it includes the rims, you'll need to check the offset, as well as the interior brake caliper clearance.

Sorry, not at my desk or I'd give you some links.
 

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2022 M3
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I'm going to have to agree and disagree with ejw2011. Yes, changing the tire size from OE will change the speedometer. In this case, though, the change is tiny. So I think a 235/55R-17 should work fine.

So a friend of my uncle is offering me his winter rims and tires set. I wonder if 235/55R17 will fit my 2011 BMW X3 ? My X3 is 28i.
Just to make this thread useful to others, let me recap the F25 X3 original equipment sizes:

17": 225/60R-17 about 753 rev/mile (varying slightly with tire brand and model)
18": 245/40R-18 about 751 rev/mile
19": 245/45R-19 about 751 rev/mile and optional rear fitment 275/40R-19 751 rev/mile
20": 245/40R-20 about 750 rev/mile and optional rear fitment 275/35R-20 755 rev/mile

The 235/55R-17 proposed by the OP is about 766 rev/mile, so it varies from OE a bit more than the above range, but is still within 2%.
 
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