If you want the TPMS, they'll cost you another $300 or so, so the tire/wheel package from TireRack will cost more than the LIST price on the same tire from BMW, and some have been able to get a discount from their dealer. Now, if you live in Canada, they do not use the TPMS...they use the computer and the anti-lock speed sensors to determine when a tire is getting low because it squishes more, and the rotation rate varies from the others in the car. The TPMS will catch a slow leak faster, but you don't have a choice, your car comes with only one or the other and you can't (cheaply, if at all) switch systems. TPMS don't last forever...bought from BMW, you'll have a warranty. Much less coverage from an aftermarket, and won't be covered by BMW. The batteries usually last a long time, but that isn't the only thing that can go on one of them...and, if your state has mandatory inspections, on most of them, if your car came with them, you must have TPMS installed to pass.
You might find this interesting reading: http://bmwblog.kinja.com/do-you-need-winter-tires-on-your-bmw-or-any-other-car-1653818480
FWIW, I searched the owner's manual and could not find the wheel bolt torque requirements, so I called my local BMW service manager; according to him, the spec for the i3 is 80-ftlb.
