Yeah, I'm definitely happy about that! Last year I blew a rear tire on my '21 Trail Boss when we were on our way back from Florida. I put the spare on and when I would make slow turns the rear would lock up and hop around the turns. The spare was that much smaller to cause the g80 to engage. Needless to say I had to move to the front when I got home until I was able to get it replaced.It's probably because the software isn't set up for a spare TPM. Every truck from base to ZR2 probably use the same software. ZR2 is the only model to include a factory wheel/tire as the spare so be happy we at least get that.