On the other hand, some new Subaru models leave the dealer with donut spare tires, or what Subaru calls 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, saving weight and freeing up space in the trunk. On the other hand, they are not perfect, and there are limitations on donut spare parts.
Unlike a tire repair kit, you’ll need to remove the flat tire to install the donut spare tire, 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 repairing a flat tire. Once installed, donut spares should not be driven faster than 50 mph, and they are not intended to support the weight of your vehicle for more than 70 miles.
Donut tires also come in many sizes and specifications. For example, the Subaru Crosstrek has a T145/80 D17 spare wheel. The “T” means temporary, while the 145 is the width of the tire in millimeters. Additionally, 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.
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