Yes, you can use your old tire as a spare, as the general rule is that a spare within 2" of the bad tire on the ground will work, but a used tire the same size as your tires on the ground won't cost much.Besides, can you have a different size spare wheel?
Can you confirm that it is illegal to drive with different sized wheels on the same axle. You must always make sure that tyres on the same axle are of the same size and aspect ratio – your car will fail the MOT test if they're not – but the law makes an exception for temporary use spare wheels fitted in an emergency.
Secondly, can you run two different size tires on the same axle? Having two different-sized tires on the same axle is generally not a good thing. If the diameter of the two tires is close, then the rolling radius is about the same, so in the short term, you probably won't have any damage, but long term, you run the risk of messing up your car's differential.
Considering this, can a spare tire be smaller?
Your spare tire, be it a full-size non-matching spare tire or a compact spare, is typically a smaller diameter than your four normal use tires. It may be a slight half-inch up to a couple inches in diameter different and the width is usually significantly less than your factory tires.
Can you drive with one tire bigger than the other?
A: The mismatched tire is a dangerous situation. It should be replaced with the proper size immediately. And they have placed the tire on the worst possible end of the car, the rear. Mis-sized rear tires can lead to a loss of control under hard braking (the car can spin).
Are all donut tires the same size?
Spare tires are full-size tires that are the same size as your existing tires. On the other hand, donuts are a temporary spare tire . They are much smaller than your regular tires and are only meant for short distances until you can get a new full-sized tire.What happens if I put different size tires on my car?
Wider tires don't perform as well in slick conditions. When taller tires than recommended are used, Shaffner says steering will seem sloppier and the car may take bumps more abruptly. Also, tires that are too wide can wear out the wheel bearings and cause rubbing in the wheel wells on turns, Shaffner warns.Can you put different size tires on the same rim?
Because tires have flexible sidewalls, a single tire size will fit on a variety of rim widths. The width of the rim will influence the width of the tire. A tire mounted on a narrow rim would be "narrower" than if the same size tire was mounted on a wide rim.Can I use a donut from a different car?
The compact temporary spare tire and wheel that comes with a vehicle is designed to fit that vehicle only. Never attempt to use a Temporary/Compact Spare Tire and wheel on another vehicle unless it is the exact same make and model.Why the spare tire is smaller?
The main reason your spare tire is smaller is because they are meant to take up less space in your vehicle. Donut spares usually have a smaller diameter, narrower width and shallower tread, which means they make great space-savers.Can you mix and match tires?
We recommend that the same tyres are fitted on all wheel positions of your vehicle. If however, due to availability or economical considerations, mixing is necessary then it is permissible to mix brands and tread patterns as long as the same tread patterns and brands are fitted across the same axle.Do all spare tires fit all cars?
Nearly every car used to come with a full-size spare tire. In recent times, however, fuel economy requirements, trunk space allotment, and safety concerns have prompted automakers to shift toward smaller temporary spares. In some vehicles, there's no spare at all.Can I drive 200 miles on a donut?
Safe-Saver/Donut Spare Tire A general rule of thumb is to drive no more than 70 miles and no faster than 50 miles per hour before replacing your donut with a new tire. The biggest reason to use these space savers for a short period of time is because they have little to no tread.Are spare tires smaller than normal tires?
Compared to full-sized spare tires, they are designed to save weight and trunk space. Since they are not designed for long-term use, they typically feature a smaller physical size, narrower tread and reduced tread depth compared to the tires normally used on the vehicle.Do all 4 tires have to be the same size?
It should go without saying, but all wheel drive and four wheel drives vehicles should have the same tire size on all four wheels. Having different sizes on some four wheel and all wheel drive vehicles can actually do damage to the vehicle. Even then, the two tire sizes are nearly identical in diameter.Is it OK to have mismatched tires?
A car with mismatched front and back tires should still be usable, especially if it is a two wheel drive vehicle. If the tires are different sizes then they may also wear at different rates, and you'll be shopping for new tires sooner than you think. Functionally, mismatched tires will wear out at different rates.What are spare tires called?
A spare tire (or stepney) is an additional tire (or tyre - see spelling differences) carried in a motor vehicle as a replacement for one that goes flat, has a blowout, or has another emergency. However, some spare tires ("space-saver" and "donut" types) are not meant to be driven long distances.Can wrong size tires damage car?
Unfortunately, altering the tire size of a vehicle without thorough and careful consideration is a decision that can really bite. Fitting the wrong tire size can cause damage to a vehicle, and is a real safety hazard as well.Can I use 17 tires instead of 18?
When you move to a larger wheel diameter (such as from 17 to 18 inches), you need new tires to match. Some potential performance benefits may be offset by the additional weight of the larger tires and wheels. An 18-inch tire, for example, will probably weigh at least a couple of pounds more than a 16- or 17-inch tire.Can you buy a donut tire?
Cost of a new spare tire Some donut tires can be purchased online for as low as $50, but are more expensive at a tire retailer. “We always recommend a spare tire for a vehicle that is not equipped, unless they have run-flat tires,” Haynes says.Can you use a 16 inch space saver wheel on a car with 18 inch wheels?
DO all SEAT Leons use 16-inch spare wheels? The car runs on 18-alloys, but the space saver wheel in the boot is 16-inch diameter.Can I use 215 tires instead of 205?
215 and 225s both fit the stock 17x7 wheel nicely, and although 235s are used on the cup cars, its widely discouraged on the board to do so without upgrading to a wider wheel. 215 over 205- more rubber on the road = better cornering. It also gives you more sidewall to help protect the rims from pot holes. 
