According to auto experts, this makes many drivers wonder about the safety and effectiveness of using this type of tire. But in reality, this is a deliberate design of automobile manufacturers to optimize many factors.
Optimizing space and weight
According to Mr. Tom Wilson, engineer in charge of product testing at Car and Driver, one of the important reasons for making spare tires smaller is to save space inside the storage compartment.
Automotive manufacturers are always looking for ways to optimize space. A smaller, narrower tire helps save space and reduce overall vehicle weight, thereby improving fuel efficiency, said Mr. Tom.
Normally, small reserve tires, also known as temporary tires, are lighter than the main tire. This not only reduces the total weight of the vehicle but also makes it easier for users to replace tires in emergency conditions.
Cost and practicality
In addition to technical factors, cost is also a reason why automakers choose small tires as backup tires. A set of main tires costs quite a lot, and equipping a similar tire can increase the cost of the vehicle.
Small spare tires are designed for use only in emergency situations and for short distances, usually no more than 80 km and a maximum speed of 80 km/h. Temporary use helps the vehicle continue moving to the repair shop without calling for help or changing tires on the spot.
Notes when using small spare tires
Although convenient, drivers need to pay special attention when using temporary tires. Due to its smaller size and traction, this tire is not suitable for long-distance operation or in harsh weather conditions.
Smaller spare tires dont have the same heat capacity as conventional tires, warned Andrew Burnett, a technical expert at Bridgestone UK. If it runs at a speed exceeding the permitted speed, it can overheat and cause serious damage.
In addition, when installing small tires on a wheel, the powertrain can be unbalanced, affecting the do tuoi and stability of the vehicle.
For vehicles using four-wheel drive (AWD), using uneven tires for a long time can lead to defective microchips or gearboxes.
New trend: Tire patch to replace spare tire
Many modern car lines, especially electric cars, have completely removed the spare tire to reduce weight and increase luggage compartment capacity. Instead, a temporary tire patch with an electric pump or self-patchable tire technology.
