A compact donut spare (the small, narrow tire in most car trunks) is designed for emergencies only — typically 50 miles max at 50 mph max. A full-size matching spare has no such restriction. Here's what you need to know.
Compact spare (donut) limits
Most compact spares are rated T-type (Temporary) with a max speed of 50 mph and a recommended range of 50–70 miles. These are printed on the sidewall of the spare itself — look for "TEMPORARY USE ONLY" and the max speed rating.
The donut is narrower and smaller than your regular tires, which affects handling, braking distance, and ABS/traction control performance. It also puts uneven stress on the AWD/4WD drivetrain if left on too long.
Don't take a donut onto the highway at 70 mph, don't forget it's there, and don't leave it on for weeks. Get the flat repaired or replaced as soon as possible.
Full-size spare
A full-size matching spare (same size, speed rating, and load rating as your regular tires) can be driven indefinitely. Many truck and SUV owners run a full-size spare mounted on a matching wheel for exactly this reason.
Full-size non-matching spares (different brand, tread depth, or size) should still be treated as temporary — especially on AWD vehicles where mismatched tread depths can stress the center differential.
What to do after a flat in West Georgia
Install the spare and drive to the nearest tire shop — don't drive more than necessary on a donut. Most shops will repair a repairable flat (nail/screw in the tread with no sidewall damage) for $15–30.
If the tire is not repairable (sidewall damage, large hole, run-flat damage), you'll need a replacement. Having your tire size handy speeds the process.
West Georgia has tire shops across Carroll, Douglas, Paulding, Haralson & Heard counties. Most open by 7–8 AM and several offer 24-hour roadside service.
Frequently asked
Can I drive on the highway with a spare?
With a compact donut: no, or very briefly at well below highway speed. With a full-size matching spare: yes, normal highway driving is fine.
What PSI should a spare tire be?
Most compact spares are rated for 60 PSI — check the sidewall. Unlike regular tires, the spare is often ignored for months or years and loses pressure. Check it now before you need it.
Do I need to get an alignment after a flat?
Not from the flat itself, unless the wheel hit a curb or pothole hard enough to damage the suspension. If the car pulls after the flat is repaired, get an alignment check.
Last updated 2026-06-27. General guidance only — confirm specifics with a local shop for your exact vehicle.