What is the tire size of the Changan Uni-K?
3 Answers
The Changan Uni-K comes with three tire size options: 255/50R20, 255/55R19, and 265/45R21. In 255/50R20, the first number 255 indicates the tire width is 255mm, 50 represents the aspect ratio of the tire section at 50% (meaning the section height is 50% of the width), 20 denotes the rim diameter is 20 inches, and the middle letter "R" stands for radial tire. In 255/55R19, the first number 255 indicates the tire width is 255mm, 55 represents the aspect ratio of the tire section at 55% (meaning the section height is 55% of the width), 19 denotes the rim diameter is 19 inches, and the middle letter "R" stands for radial tire. In 265/45R21, the first number 265 indicates the tire width is 265mm, 45 represents the aspect ratio of the tire section at 45% (meaning the section height is 45% of the width), 21 denotes the rim diameter is 21 inches, and the middle letter "R" stands for radial tire. The Changan Uni-K is equipped with Continental MC6 tires, which feature a wide tread and thin sidewalls, providing strong grip performance. Additionally, the spare tire is full-size. If you wish to replace the tires yourself, follow these steps: Retrieve the spare tire and jack, position the jack under the vehicle frame near the tire to be replaced, ensuring it contacts the metal part of the frame. Raise the jack until it supports the vehicle, making sure the jack is positioned directly under the car and perpendicular to the ground. Remove the hubcap and loosen the nuts counterclockwise. Do not fully remove the nuts; just loosen them enough to reduce resistance. Keeping the tire on the ground while loosening ensures the nuts turn, not the tire. Continue turning the nuts counterclockwise until they are loose. Repeat this step for all lug nuts, then remove them completely. Place the new tire onto the wheel hub, carefully aligning the tire rim with the wheel bolts. Install the lug nuts and hand-tighten them until all nuts are snug. The tire replacement is now complete. In addition to the size, tires also display the following common information: Tire cord material: Indicated by Chinese pinyin, such as M for cotton cord, R for rayon cord, N for nylon cord, G for steel cord, and ZG for steel radial cord. Speed rating: Indicates the maximum speed at which the tire can carry a specified load under defined conditions. Letters A to Z represent certified speed ratings from 4.8 km/h to 300 km/h. Common speed ratings include: Q: 160 km/h; H: 210 km/h; V: 240 km/h; W: 270 km/h; Y: 300 km/h. Rim specification: Indicates the rim size compatible with the tire for practical use, such as "Standard Rim 5.00F."
I've been driving my Changan UNI-K for almost a year now, and it came with factory-fitted 265/45 R21 tires, which provide a really comfortable ride, especially stable at high speeds. These dimensions mean 265 mm width, 45% aspect ratio, and 21-inch rims. You need to pay attention to regular maintenance, like checking the tire pressure monthly and keeping it around 2.5 bar—too high or too low can affect driving and fuel consumption. Be extra careful when driving on rough roads or in mountainous areas. If the tires wear out quickly, replace them early—don't wait until the tread is completely worn out. Last time I went for maintenance, the mechanic reminded me that wider tires like these tend to consume more fuel but offer better grip, reducing the chance of slipping during turns. On the other hand, when choosing tires, you should also consider the season. If you use winter or snow tires, the size must match the factory specifications, or it might affect the ESP system. In short, regularly checking your tire condition can extend their lifespan and ensure safety.
As a car enthusiast, I know the Changan UNI-K comes standard with 265/45 R21 tires, which is quite a sporty specification for an SUV. The 45 aspect ratio means shorter sidewalls, offering clearer road feedback but a slightly bumpier ride over potholes, with the advantage of better stability in corners. If you pay attention to tire performance, the original size pairs well with Michelin or Pirelli, as the brand affects durability and noise levels. I've also researched that you shouldn't randomly change the size—for example, switching to 265/40 would lean toward better handling but reduce comfort. Additionally, maintaining tire pressure between 2.4-2.6 bar during daily use helps reduce abnormal wear. Check the tread depth whenever you wash your car; generally, tires should be replaced when the wear indicator reaches 1.6 mm. Considering the UNI-K's power, this tire size helps save some fuel, but replacing a set isn't cheap—choosing domestic brands like Chaoyang is also an option.
