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      10-24-2011, 04:50 PM   #2
brissim
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Drives: X3 30d (2011 F25) - now sold
Join Date: Jul 2011
Location: Brisbane, Australia

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There are probably no technical reasons why you can't use 225/55/17s in place of 225/60/17s. I'm currently running 235/60/17 (ie oversized) conventional tyres on my X3 without issues. But you may need to check what your local laws are regarding these tyres. For example - in some states here in Australia that would be illegal because the theoretical ODs of the tyres are greater than the +/-15mm variance allowed from the reference tyre (679mm for the 225/55/17 vs 702mm for the 225/60/17). The only other thing is because the ODs are different, your speedo will read about 3% higher on the smaller tyres.

Tony
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