Q: Why would you put a 19-inch wheel on a Model X instead of something bigger?

Because a smaller wheel means a taller tire sidewall, and on a heavy SUV that sidewall does real work. This package runs a 265/50R19 fitment, which adds cushioning over broken pavement, more forgiveness against potholes and expansion joints, and better protection for the rim in daily use. For a Model X that racks up highway and family miles, the 19-inch setup often suits how the car is actually driven better than a low-profile 21 or 22.