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      07-05-2011, 10:01 AM   #3
mario486
Mario
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Drives: X1 XDrive 2.0d, Mini Cooper
Join Date: Jun 2010
Location: Scotland/Alba

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As R0ut3r says the spec for the X1's wheels are PCD : 5x120 Offset : 30 to 50 Bore : 72.6. These figures are valid for 17" to 20" rims.

Fitted with the standard 225/50/17 tyres gives a overall diameter of 25.86" or 657mm.

Assuming you use the 245/45/18 tyres it would give you a new overall diameter of 26.68" or 678mm which is around 3% larger. This is slightly more than the average max recommended variance of +-2.5% but imho it should be OK.

Next thing to look at is the actual rim specification which you should find somewhere on the rim itself. PCD and Bore should be fine because as far as I know all modern BMW's are 5x120 and 72.6 respectively.

However, its the offset that’s going to be a problem. Again, what R0ut3r says is correct, the 6-series's ranges from about 12 to 20 mm which is way different from the 30 to 50mm on the X1. So basically the 6's rims are going to interfere with suspension and/or the body.

I apologise for the lengthy description but there have been a few discussions on this forum about the subject.
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