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On the other hand, some new Subaru models leave the dealership with donut spare tires, or what Subaru refers to as a "temporary use spare tire." It includes the Subaru Crosstrek (including Base, Sport, Premium, Limited, and Wilderness), Forester (Base, Premium, Limited, Touring), Outback (Base, Premium, Onyx, Limited, touring, Limited XT, Touring XT), and the Ascent SUV (Premium, Limited, Limited Bronze Edition, Touring, and Onyx Touring). Donut spares are lighter and more compact, helping to save weight and free up space in the trunk. Then again, they're not perfect, and there are limitations to donut spares. Unlike a tire repair kit, you'll need to remove the punctured tire to install the donut spare, and this means having a jack, a tire wrench, and some elbow grease at your disposal. In short, it helps to know a thing or two about fixing a flat tire. Once installed, donut spares must not be driven over speeds of 50 mph, and they're not meant to support your vehicle's weight for more than 70 miles. Donut tires come in many sizes and specs, too. For example, the Subaru Crosstrek has a T145/80 D17 spare tire. The "T" means Temporary, while the 145 is the width of the tire in millimeters. Moreover, the "80" is the aspect ratio or "thickness" of the sidewall, while the "D" and the 17 stand for "Diagonal" (referring to the tire construction) and rim size, respectively.
