THE SPARE TIRE DIDN'T DISAPPEAR
It was replaced by a different recovery system: inflator kits, run-flat tires, roadside assistance, towing, or some combination of them.
The old car carried its own recovery tool. Many newer cars carry less hardware and depend more on the kind of damage — and sometimes on outside help.
That can save weight and free up space. But it also means a routine flat can become a tow if the damage falls outside what the replacement system can handle.
SO WHAT DOES THIS MEAN IN PLAIN ENGLISH?
You may gain cargo space, lower weight, and simpler packaging. But the car may no longer carry a universal first-response tool for a damaged tire.
YES, THERE IS A LEGITIMATE BENEFIT.
Removing a wheel, tire, jack, and related hardware reduces mass.
The space can be used for cargo, battery packaging, fuel-system layout, or other vehicle needs.
For some small punctures, an inflator kit can be quicker than changing a wheel at the roadside.
Good trade when it works. The interesting part is what happens when it does not.
THE REPLACEMENT IS NOT EQUALLY CAPABLE.
AAA's testing found tire-inflator kits can work as intended in specific circumstances, but they are not useful for many sidewall, blowout, pothole, curb, or larger-damage failures. That means the replacement system is conditional in a way a physical spare often was not.
AAA FOUND THE SPARE WAS ALREADY MISSING FROM A LARGE SHARE OF NEW CARS.
AAA reported that 28 percent of 2017 model-year vehicles did not include a spare tire as standard equipment. Its roadside-assistance data also recorded more than 450,000 member calls in one year involving a flat tire and no spare in the vehicle.
AAA tied the trend in part to automakers reducing weight and improving fuel economy.
THE CAR AGES. SO DOES THE RECOVERY PLAN.
That does not automatically make the newer approach worse. It makes the recovery architecture more conditional and, in some cases, more external.
“The spare was removed because modern cars have an equivalent replacement.”
Not quite. The alternatives can be effective for the failures they were designed to handle. They do not cover every kind of tire damage, and some failures now route the driver directly toward roadside assistance or a tow.
RECOVERY GOT LIGHTER — AND MORE CONDITIONAL.
Deleting the spare can save weight and space. That is real. But when the physical spare leaves the car, part of the recovery burden may leave with it.