Quick Answer: Can My Spare Wheel Be Smaller?

Why is my spare TYRE 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.

This is especially important to maximize the storage area in your boot..

Can you use a 17 inch space saver on car with 18 inch wheels?

Can you use a 17 inch space saver on car with 18 inch wheels? The rolling circumference of the 18-inch wheels and tyres will probably be the same as the 17inch wheels and tyres. As wheels get bigger, profiles get lower. So the emergency spare for the 17s should be okay for the 18s.

Does tire size have to be exact?

Wheels and tires must be of the same diameter– e.g. only mount a 16″ tire on a 16″ wheel. However there is one other caveat– wheel width and tire width. Check Tirerack or other sites with tire specs– the acceptable wheel width depends on the particular tire model/size involved.

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.

What happens if you drive with different size tires?

A: The mismatched tire is a dangerous situation. It should be replaced with the proper size immediately. … Mis-sized rear tires can lead to a loss of control under hard braking (the car can spin). The one tire left on the car is almost an inch smaller in diameter.

Can wrong size tires damage transmission?

Increasing Tire Size Will Reduce Your Vehicle’s Effective Gear Ratio. The increased size causes the tires to rotate slower to cover the same amount of ground. … If you are running an automotive transmission this can cause some serious strain depending on the current gear ratio if you choose not to regear your system.

Can I use a different size spare wheel?

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.

Can you use a smaller space saver wheel?

Space saver tyres can either be full-size or smaller than the regular tyres fitted to your car. … In an MOT test which assesses a car’s suitability for the road, a car will always fail if not all the wheels are the same size, unless a spare wheel has been fitted temporarily purely in an emergency.

Can I drive 200 miles on a donut?

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. This makes the spare vulnerable to road hazards and projectiles.