Explainer

Guide to Using a Temporary / Compact Spare Tire

March 13, 2023 Updated May 23, 2026 Search Tires Team

Temporary spares - "donuts" - have hard speed, distance, and pressure limits. Use them wrong and you risk a blowout. Here is what every driver needs to know.

A temporary or compact spare tire — commonly called a "donut" — is a smaller, lighter spare designed to get a stranded driver to a tire shop and nothing more. It is not a substitute for a full-size tire. Use it within the manufacturer's speed and distance limits, or you risk a blowout, drivetrain damage, or a crash.

Flat tires happen unexpectedly, and waiting for roadside assistance can take hours. A compact spare lets you self-rescue, drive carefully to the nearest tire shop, and get a proper repair or replacement the same day. The catch: a donut spare has a much narrower operating envelope than the four tires you drive on every day, and ignoring those limits is a fast path to a bigger problem than the flat you just fixed.

The Three Limits Every Donut Spare Has

Compact spares are designed and rated for short-term emergency use only. There are three hard limits you must respect.

Speed: 50 mph maximum. Most temporary spares carry a yellow sidewall sticker reading "50 MPH / 80 KM/H MAX." The lighter construction and smaller contact patch heat up fast above 50 mph. Sustained highway speed on a donut can cause tread separation or sidewall failure.
Distance: 50 to 70 miles total. Manufacturers typically rate donut spares for less than 70 miles of cumulative use. Some, like the GM and Honda compact spares, are rated for as little as 50 miles. Plan the shortest route to a tire shop, not the prettiest.
Inflation: 60 psi cold. Compact spares require 60 psi — roughly double the pressure of a typical passenger tire. Check the pressure when the tire is cold, before driving. An under-inflated donut at 30 psi will fail almost immediately under load.

🔍

Check your donut's pressure twice a year. It's the only part of the tire that does any work when stored — and it leaks down slowly even when never used.

Why the Limits Are So Tight

A donut spare is engineered to save weight and trunk space. It's narrower, has a smaller tread depth, a lighter sidewall, and a much smaller air volume than a full-size tire. All of that translates into:

Less heat tolerance. The smaller air volume means the tire heats up faster. Above 50 mph the rubber temperature climbs into the failure zone within minutes.
A smaller contact patch. Less rubber on the road means less grip in turns, less traction in rain, and dramatically longer braking distances.
A different rolling diameter. Most donuts are smaller in overall diameter than the road tires. That difference is fine for a few miles at low speed but stresses differentials, ABS sensors, and AWD systems if you drive on it for longer.
No load-rating margin. Donuts are rated for the vehicle's weight, but with very little safety margin. A loaded trunk, roof rack, or trailer hitch can push a donut past its load rating.

How to Drive on a Donut Spare

Once the donut is installed, drive like you have an egg under the suspension. The goal is to reach a tire shop, not to finish the trip.

Stay below 50 mph. Take surface streets if you can avoid the freeway.
Increase following distance. Wet-weather braking on a donut is dramatically longer than on your road tires.
Avoid sharp turns. The smaller contact patch breaks loose faster than the matching road tires.
Skip the cargo. Empty the trunk if you can; a donut at full vehicle load is the worst case.
Turn off AWD or 4WD if your vehicle allows it. Mismatched tire diameters can damage transfer cases and differentials on extended drives.
Head straight to a tire shop. Not home, not work — a tire shop or the nearest installer.

AWD, 4WD, and Donut Spares Don't Mix Well

If you drive an all-wheel-drive or four-wheel-drive vehicle, read the owner's manual section on emergency spare use. Many AWD systems are extremely sensitive to mismatched tire diameters; the donut's smaller rolling diameter forces one differential to constantly slip, which can overheat and damage drivetrain components on a multi-hour drive. Subaru, in particular, recommends extreme caution and limited duration on AWD models. Some automakers ship full-size spares on AWD vehicles for exactly this reason.

Best practice on AWD with a donut: limit use to the absolute minimum mileage, stay under 50 mph, and switch to a real tire as soon as possible — same day if at all possible.

Donut Spares Age Out Too

Even an unused donut spare has a service life. The rubber oxidizes, the sidewall stiffens, and the bead can crack. Most manufacturers recommend replacing tires — including unused spares — at ten years from the DOT date code. Inspect your donut once a year for cracking, sidewall weathering, and correct inflation.

If your donut is older than ten years, replace it. If you don't, the tire might be unusable the day you actually need it — which is the entire reason it exists.

What This Means for You

Check your spare today. Pop the trunk, pull back the cargo mat, and verify three things: pressure is at 60 psi, the sidewall has no cracking, and the tire is younger than ten years (check the DOT code). Spend the five minutes now — the alternative is finding out at 11 p.m. on a dark shoulder.

When the donut comes off and it's time for a real replacement tire, you don't have to take the first quote at the closest shop. The same tire often costs $40 to $80 less at a different installer within a five-mile radius. Compare drive-out prices first.

Frequently Asked Questions

How fast can I drive on a donut spare?

Most temporary spares are rated for 50 mph maximum. Driving faster heats the tire rapidly and can cause sudden failure.

How many miles can I drive on a compact spare?

Manufacturers typically rate donut spares for less than 70 miles of cumulative use. Some are rated for as little as 50. Plan the shortest route to a tire shop, and treat the donut as a one-trip tire.

What pressure does a donut spare need?

Most compact spares are stamped 60 psi on the sidewall. Check the pressure when the tire is cold. Even unused, donut spares leak down slowly — verify the pressure twice a year.

Can I use a donut on an AWD or 4WD vehicle?

Yes, but with caution. Mismatched tire diameters stress AWD differentials and transfer cases. Stay below 50 mph, drive only the minimum distance to a tire shop, and consult the owner's manual. Some AWD manufacturers ship full-size spares for this reason.

How long does an unused donut spare last?

Most tire manufacturers recommend replacing tires at ten years from the date of manufacture, even unused spares. Check the DOT code on the sidewall — the last four digits give the week and year.

More on spare tires, pressure, and roadside readiness:

Is It Necessary to Replace the Spare Tire on My Truck? — When a spare ages out and how to read the DOT date code.
How to Check & Set Tire Pressure — Step-by-step pressure check — including the 60-psi donut spare.
How Long Do Tires Last? — Tire age limits, including spares that have never seen the road.
Flat Tire Statistics — How often drivers actually need their spare.

Sources

Guidance below is drawn from manufacturer technical bulletins and U.S. consumer-safety publications.

NHTSA — Tire Safety — Federal tire safety guidance, including spare-tire inflation and inspection.
NHTSA — TireWise Consumer Guide — Federal consumer guide to tire age, pressure, and spare-tire condition.
Bridgestone — Tire Maintenance — Speed and distance limits and care for temporary spares.
Michelin — Tire Care — Inspection, inflation, and storage guidance.
Goodyear — Tire Care & Maintenance — Spare-tire pressure and inspection.
Tire Rack — Tech Information & Test Results — Independent reference on donut spare construction and use.
U.S. Tire Manufacturers Association — Tire Care & Safety — Industry guidance on spare tire pressure and service life.
Consumer Reports — Tire Buying Guide — Consumer guidance on spare-tire types and limits.
AAA — What to Do If You Have a Flat Tire — Roadside reference for safely changing to a spare.
Subaru — Owner Resources & Manuals — AWD-specific guidance on temporary spare use.
Edmunds — Compact Spare Tire Guide — Reference on donut speed/distance limits and disappearance from new vehicles.

Once you're back at a tire shop, search your tire size or vehicle on SearchTires before you buy to compare drive-out prices on a permanent replacement.

All Articles