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Originally Posted by doc@tirerack
You may want to get some stronger brake pads, however, as the stock pads were made with the lighter 17" wheels in mind.
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Not quite true. BMW use the same pads and rotors on the X5 regardless if your X5 was shipped with 17", 18", or 19" wheels/tires from the factory. Only the 4.6is/4.8is get slightly larger front pads/rotors for their 20" paws. I would definitely look into getting a large brake kit to help with the added unsprung weight of the 22s. It will certainly help with the aesthetic as well since the 22s will make the OEM calipers/rotors look puny. See how tiny the rotor/caliper appeared when wrapped in 22s.