Swapping a Spare on the Shoulder, Step by Step

Feb 20, 2025 · 5 min read

Changing a flat isn't hard, but the shoulder of a highway is a bad classroom. Here's the safe way to do it, plus a few red flags that mean you should stay in the car and let a pro handle it.

Before you touch a lug nut

• Pull as far off the road as possible, flat, hard ground, wheels straight.
• Hazards on. Parking brake set. Passengers out and behind the guardrail, never between the car and traffic.
• Set a reflective triangle 20–30 feet behind the car.

The steps

1. Loosen the lug nuts a quarter turn while the tire is still on the ground.
2. Place the jack under the reinforced jack point in the owner's manual, not random plastic.
3. Raise until the tire is about an inch off the ground.
4. Fully remove the lug nuts and pull the flat straight off.
5. Mount the spare, hand-tighten the lugs in a star pattern.
6. Lower the car, then torque the lugs firmly in the same star pattern.
7. Check the spare's pressure at the next station, most "donuts" need 60 psi.

When to skip it and call

• You're on a highway shoulder with traffic close by.
• The flat is on the traffic side of the car.
• No spare, or the spare is also flat.
• It's dark, raining, or below freezing.

A mobile tire change is one of the fastest, cheapest calls we run. If any of the above is true, don't gamble on the shoulder.