tool

I've searched all over the forums and I've seen conflicting responses on whether or not the activation tool is needed. Does anyone know for sure? Curious too as to how the car even knows which tire what sensor is installed on. I've seen ebay, tirerack, and tpms.com recommended for the sensors...

Hello fourm, Just went from the stock 235/50/18 rims and tires to a 275/40/18 set up. I don't care about speedometer re calibration but what I care about is miles are being put of faster due to reduction of the sidewall. So technically there are miles being put on that im not driving. The...