funny... my local dealer just yesterday told me to not upgrade to the 20s simply because of the RFTs...they're too hard, ride harsh, aweful in the winter and offer no traction...

she said go with aftermarket tires if you really want 20s!

Michelin Latitude Tour all-seasons are recommended.

but there are many others..

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2012 X5 50i M-Sport
2014 X3 35i M-Sport