I just took 18 inch winter rims off my E60 550i an replaced the 245/40/18 Dunlop Winter Sport 3Ds with 245/45/18 Dunlop WS M3s for my 550ix. (no 3Ds available.) These are my third set of Dunlop winter tires. Great in snow and ice. A little noisy after 15k. Last two sets were non RFTs, much better ride. I bought BMW mobility kit (compressor and can of sealant) for $150.
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