Go to tirerack.com. Enter the year/make/model of your car but look for 20" tires. Michelins are the OEM 20" tire generally on E53 X5's, Toyos & Yokos apparently last longer.

http://www.tirerack.com/tires/Compar...All&loadRank=2

275/40/20 Front
315/35/20 Rear

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