Can a Spare Tire Be Used on the Highway?

[VonAnastasia]

It is not recommended to use a spare tire on the highway, as both full-size and compact spare tires carry certain risks. This is because the tread wear of the spare tire may differ from that of the other three tires, potentially causing the vehicle to veer, which is dangerous at high speeds. A spare tire refers to a backup tire for a car, with specifications matching those of the original tires. Spare tires are intended for emergency use only. Upon reaching your destination or a repair shop along the way, the damaged tire should be repaired, and the spare tire should be removed and stored as a backup again, with the repaired tire reinstalled in its original position. If the damaged tire cannot be repaired immediately or is indeed beyond repair, you may choose to install a tire of the same type and with matching tread. Do not use the spare tire for an extended period.

[DiJocelyn]

Last time when I was driving on the highway, my spare tire suddenly went flat. After replacing it with a temporary spare, the mechanic specifically warned me: These compact spares are just for emergency use! The wheel is one-third narrower than the original tire, causing the car to shake when driving, noticeably unstable when cornering, and may even fishtail during hard braking. Manufacturers stick an 80 km/h speed limit warning label on spare tires—exceeding this speed causes the rubber to overheat and deform. My neighbor Old Zhang didn’t believe it and stubbornly drove the entire way at 120 km/h, only to have the tire sidewall completely split when exiting the highway. A spare tire can last at most around 100 kilometers—getting a proper tire repair at the nearest service area is the right move.

[PaigeAnn]

Having worked in repair shops for over a decade, I've seen countless cases of spare tires being run to ruin. Non-full-size spare tires have sidewalls as thin as paper—high-speed centrifugal force causes them to bulge and deform. Full-size spares may seem reliable, but prolonged disuse leads to rubber degradation. Pay special attention to the triangular warning label on the tire sidewall—yellow background with black text stating a speed limit of 80 km/h! This limit was determined by engineers using vibration testers as the safety threshold. And never consider using a spare tire for long-distance travel—once tire temperature exceeds 90°C, the rubber softens, and a high-speed blowout is no joke.

[JakeRose]

Page 137 of the car manual clearly states: Do not exceed 80km/h with a non-full-size spare tire. Its diameter is 4% smaller than the original tire, which can cause ABS and tire pressure monitoring systems to malfunction. Last year's third-party test data was even more alarming: driving at 100km/h with a spare tire increased the braking distance by a staggering 11 meters! Don't take chances with full-size spare tires either—steel belts in tires stored for three years have likely rusted. It's recommended to set 'auto repair shops' in your phone's navigation and exit the highway at the first available opportunity.