Changing a Flat on a Gravel Shoulder

The spare tire is the last thing a driver wants to see on a gravel shoulder. It lies under the cargo floor in the back of the station wagon, or hangs from a cable beneath the truck, and it is always a few pounds lower on air than the tire it is meant to replace. The driver has felt the thump and the pull for several miles, the rear wheel going soft over a road the color of sage, and has guided the car off the pavement onto the shoulder, where the gravel bites the tires and the hazard lights begin their double-blink.

Hazard lights

The first signal is the double-blink. The driver reaches for the red button, and the orange lights begin their pulse on the gravel shoulder, visible for a long way down the straight road. The engine is off, the parking brake is set, and the driver puts on the jacket from the back seat because the shade moves fast in the West. The gravel crunches underfoot, and there is no sound but the wind over the sage and the ticking of the exhaust pipe cooling.

Finding the jack point

The jack comes out of its compartment — a folded steel puzzle in a molded tray, or a bottle jack in the under-seat box. The driver assembles the handle and slides a hand along the rocker panel to find the reinforced notch, the place where the pinch weld is meant to take the load. On a truck it is a bracket on the axle; on a car it is a stamped rectangle. The driver sets the jack's foot on the packed gravel, not the loose stones, and cranks until the head just touches the metal.

Loosening the nuts

Before the car is lifted, the lug nuts must be broken free. The driver fits the lug wrench over the first nut and puts a foot on the long arm. The car's weight is the best torque there is. The nut gives with a hydraulic crack, a sound like a knuckle reporting in, and the driver works around the wheel, loosening each nut a half-turn while the tire still takes the weight. The flat has been thumping for miles, so the wheel is warm but not hot, and the nuts are tight from the last service.

Raising the car

The jack handle goes into the crank and the driver turns it. The car rises an inch at a time, the gravel shoulder tilting as the suspension unloads. When the flat clears the ground, the driver gives the jack one more turn, to make room for the spare, which is taller than the flat if the flat is not quite flat. On a crowned shoulder, the passenger side is always a little low, so the driver sets a flat rock under the jack's base.

Removing the flat

The lug nuts spin off by hand now. The driver stacks them in the hubcap or a jacket pocket, somewhere they will not roll into the sagebrush. The flat pulls straight off the studs and leans against the fender. The sidewall has a crease from the miles of low pressure, and inside the wheel a ring of rust dust from the brake disc has settled in the pattern of the cooling vanes.

Mounting the spare

The spare is heavier than it looks. The driver lifts it with both hands, sets the holes over the studs, and pushes. If it is a compact spare, the sidewall is stiff and it goes on with a dull thud. The driver threads the nuts two turns each by hand to hold the wheel, then lowers the jack until the tire takes the car's weight. The spare's own low pressure makes the sidewall bulge a little more than it should before the car is back on it.

Tightening in order

With the tire on the ground, the driver tightens the nuts in a star pattern: top, then lower left, then bottom right. The lug wrench clicks over each nut, and the driver goes around twice, because the first pass is always a touch loose. The hubcap goes back on with a push, or the center cap goes on crooked, which is no harm on a gravel shoulder.

Stowing the flat

The flat goes into the cargo bay, valve-stem up, and the jack goes back into its molded tray with the handle and the lug wrench. The warning triangle folds into its case and slides under a seat. The driver kicks the loose gravel off the pavement and looks at the shoulder for anything left behind. Sometimes one of the lug nuts has rolled under the car, and the driver walks all the way around to find it.

Driving on

The spare tire is not meant for the whole journey. The driver keeps the speed down, below the drift of the steering wheel, and the car holds a steady, patient pace on the two-lane road to the next town. The gravel shoulder recedes in the mirror, and the spare tire rides on the right rear hub, low on air, its sidewall flexing with every rotation of the wheel.