Spares cannot be driven over 50 miles per hour. Spare tires shouldn’t be driven for more than 70 miles. You’ll have less traction than with a full-size spare. If there are any other restrictions for your donut spare, you should see them listed on the tire itself. working on it. I have the 275/70/17 AT3W's installed on my 4runner. I found a brand new take off 255/75/17 BFG and installed it as my spare tire. Fits under the 4runner perfect and it is tucked under a little more than the stock spare. Found the BFG on offer up for $40. The full-size spare tire is designed to be durable for a heavy or large vehicle. It is sturdy and can get you within 50 to 100 miles at a maximum speed of 50 Mph. That is a reasonable distance to get you to a nearby tire shop. The donut spare or space-saver tire is the next when it comes to covering a wide range of distance. You should only use the temporary spare tire for emergencies. If you use the spare tire for too long, there is a good chance it will end up flat. In fact, you should only use the spare to drive for about 50 miles at most. However, before you use the spare, check with your manufacturer to see the recommended mileage – it could be more or less. Unfortunately most new cars, regardless of brand, have no spare tire. In some makes, you can purchase one as an option but they are expensive. I am with you, I would absolutely prefer a spare tire. What I did was purchase a wheel and tire from another Abarth owner who replaced his wheels and tires and carry on longer trips just in case. Questionable. Replace the tire. As long as the vehicle is not all-wheel drive, you can replace that tire. Search for a used tire place with decent tires if you can not afford a new one. Also, put the doughnut on it for the time being—Hell of a lot safer. Mind your speed with the doughnut. Continuing to drive on a donut not only puts the tire at risk but also compromises the vehicle's performance and your safety. Most donuts are only rated for 50 to 70 miles of use at speeds not exceeding 50 mph. Make it a priority to visit a tire shop and get your regular tire installed. 4. Exercise caution in wet conditions. Different factors may affect the air pressure in your spare tires. Knowing them helps you keep the spare tire at the optimal level. Temperature Fluctuations. A change in air temperature alters the PSI of your spare tire. A 10-degree Fahrenheit temperature increase raises the tire’s air pressure by approximately 1 to 2 PSIs. Q: How Many Days Can You Drive On A Spare Tire? A spare tire can have your back for a considerable time as long as you do not use it past 70 miles at a time. It has a diminutive frame, enough to offer support for a short distance. If used sparingly and properly maintained, a donut wheel can serve you up to seven years. Drive slowly. Try not to go faster than about 15-20 miles per hour on a flat. Doing so may cause irreparable damage to the metal wheel beneath the tire, and could even cause you to lose control of the vehicle. Press down on the accelerator lightly, or, if possible, idle along until you find a suitable place to pull over. zSq9AxM.