How to Change a Tire

Getting a flat tire is never convenient, but knowing how to change it safely can save you time, money, and stress. This guide walks you through the essential equipment, safety precautions, and the 10-step process for a successful tire change.

Equipment Needed

• Jack: Used to lift the vehicle off the ground. Check your owner's manual for the correct jacking points.
• Lug Wrench: A tool used to loosen and tighten the lug nuts holding the wheel in place.
• Spare Tire: Ensure your spare is fully inflated and in good condition before you need it.
• Wheel Wedges/Chocks: Used to prevent the vehicle from rolling while jacked up.
• Optional but Recommended: Flashlight, gloves, reflective triangles or flares, and a portable tire inflator.

Safety First

Before you begin, prioritize safety:

• Find a Flat Surface: Never change a tire on an incline. Find a level, solid surface like concrete or asphalt.
• Hazard Lights: Turn on your hazard lights immediately to warn other drivers.
• Apply the Parking Brake: Engage the parking brake to ensure the vehicle doesn't roll.
• Use Wheel Wedges: Place wedges (or large rocks/bricks) behind or in front of the tires opposite the flat tire.

The 10-Step Process

1. Remove the Hubcap/Wheel Cover: If your lug nuts are covered, remove the cover first using the flat end of the lug wrench.
2. Loosen the Lug Nuts: While the car is still on the ground, use the lug wrench to loosen the lug nuts counterclockwise by about half a turn. Do not remove them completely yet.
3. Position the Jack: Place the jack under the vehicle's designated jacking point near the flat tire. Refer to the owner's manual for the exact location.
4. Jack Up the Vehicle: Raise the vehicle until the flat tire is about 6 inches off the ground. Never place any part of your body under the vehicle while it's supported only by the jack.
5. Remove the Lug Nuts: Completely unscrew the loosened lug nuts and remove them. Keep them in a safe place.
6. Remove the Flat Tire: Grip the tire by the treads and pull it straight toward you. Set it aside flat on the ground.
7. Mount the Spare Tire: Align the holes on the spare tire with the lug nut posts and push the tire onto the hub.
8. Hand-Tighten the Lug Nuts: Put the lug nuts back on and tighten them by hand as much as possible.
9. Lower the Vehicle Partially and Tighten: Lower the jack slightly so the tire rests on the ground but doesn't bear the full weight. Use the lug wrench to tighten the lug nuts in a star or crisscross pattern to ensure even pressure.
10. Lower Completely and Final Tighten: Lower the vehicle completely, remove the jack, and give the lug nuts one final, forceful tightening in the star pattern.

Torque Specifications

Lug nuts must be tightened to a specific torque to ensure they don't loosen while driving or warp the brake rotors. Check your owner's manual for the correct torque specification (usually between 80-100 lb-ft) and use a torque wrench if available. If you changed the tire on the roadside without a torque wrench, have a mechanic check the torque as soon as possible.

Spare Tire Limits

Most modern vehicles come with a "donut" or space-saver spare tire. These are not designed for long distances or high speeds. The general rule is the "50/50 rule": do not exceed 50 mph and do not drive more than 50 miles. Full-size spares do not have these restrictions, but should still be inspected for wear and age.

Run-Flat Tires Explained

Some vehicles, particularly luxury cars, are equipped with run-flat tires instead of a spare. These tires have reinforced sidewalls that support the vehicle's weight even with zero air pressure. They allow you to drive for a limited distance (usually up to 50 miles) at reduced speeds (up to 50 mph) to reach a repair shop. They cannot be repaired and must be replaced if punctured.

Tire Repair Kits vs. Spare Tires

To save weight and space, many manufacturers provide a tire repair kit (sealant and inflator compressor) instead of a spare. These are useful for small punctures in the tread but are ineffective against sidewall blowouts or large gashes. If your vehicle only has a repair kit, consider adding an aftermarket spare tire kit or a roadside assistance plan.

AAA vs. DIY

Changing a tire yourself is a valuable skill, but it's not always the safest or best option. If you are on a busy, narrow highway shoulder, in severe weather, or lack the physical strength to lift the tire or loosen tight lug nuts, it is far safer to call a roadside assistance service like AAA or your insurance provider.

Tire Pressure Monitoring System (TPMS)

Your TPMS dashboard light will illuminate if one or more tires are significantly under-inflated. Always check tire pressures monthly with a manual gauge, as the TPMS only warns of severe pressure drops. After installing a spare, the TPMS light will likely stay on until the repaired or replaced tire is reinstalled.

When to Replace Tires

Tires should be replaced when the tread depth reaches 2/32 of an inch. You can use the penny test: insert a penny upside down into the tread groove. If you can see all of Lincoln's head, you need new tires. Tires should also be replaced every 6 to 10 years regardless of tread depth due to rubber degradation.

Seasonal Tire Rotation Schedule

To ensure even wear and maximize the lifespan of your tires, they should be rotated regularly. A good rule of thumb is to rotate them every 5,000 to 8,000 miles, or every time you get an oil change. The rotation pattern depends on whether your vehicle is front-wheel, rear-wheel, or all-wheel drive.

Tire Size Reading Guide

Understanding the numbers on your tire sidewall (e.g., P215/65R16) is crucial when buying replacements:

• P: Passenger vehicle (LT stands for Light Truck).
• 215: The tire's width in millimeters.
• 65: The aspect ratio (the sidewall height is 65% of the width).
• R: Radial construction (the industry standard).
• 16: The wheel/rim diameter in inches.

Frequently Asked Questions