Emergency Wheel: Wrong Placement Can Be Disastrous

A spare wheel is a full-size fifth wheel that matches your car’s normal wheels. You can drive on it as normal, and it maintains balance and supports proper vehicle safety systems.

An emergency wheel, often called a donut wheel, is smaller and lighter. It is only meant for short distances at reduced speeds. The donut is not a long-term solution and can affect your tyre wear, steering system, and overall stability.

Emergency wheel placement matters because your car is engineered to drive on four wheels of the same size for balance.

The smaller wheel rotates at a different speed. This can confuse your vehicle’s safety systems and destroy the steering system, differential, and drivetrain.

Incorrect placement can lead to:

• Uneven braking performance
• Reduced traction and pulling to one side
• Increased stress on the drivetrain
• Disabled safety systems

Modern cars are more sensitive, and these risks become more serious depending on whether your car is front-wheel drive, all-wheel drive, or four-wheel drive.

In rear-wheel drive vehicles, the engine’s power is sent to the rear wheels only, which then push or propel the vehicle forward. So, the rear wheels are doing all the hard work and need to be of the same size and quality. Generally, when you need to replace a wheel in an emergency and you only have a donut, place it in the front for safer steering. It is still important that you check your vehicle’s manual to be sure what the best recommendation is for your vehicle.

Front-wheel drive vehicles rely on the front tyres for movement and steering. Placing an emergency wheel on the front disrupts this balance. It can cause pulling to one side and a terrible steering experience.

Always keep the emergency wheel at the rear in front-wheel drive cars. If a front wheel blows, move a good rear tyre to the front and place the donut in the back. It’s double work, but worth the effort.

All-wheel drive (AWD) and four-wheel drive (4WD) systems are even more sensitive. These systems depend on all tyres rotating at similar speeds. A smaller emergency wheel can confuse the system, cause drivetrain damage, and leave you with a very empty wallet.

Driving with an emergency wheel on these vehicles can:

• Confuse ABS and traction control
• Overwork the differential
• Reduce traction control and cause excessive pulling
• Destroy sensitive components

If you do not have a spare wheel that matches all others, limit your driving distance and replace the wheel as soon as possible. And never engage 4WD when you are driving on a donut, you will destroy the drivetrain.

Emergency wheels are not built for long trips. Most manufacturers recommend a maximum speed of 80 km/h. Exceeding this can overheat the tyre and cause a whole new emergency.

You should also limit how far you drive. Use the emergency wheel only to reach a repair centre. The longer you drive, the greater the risk to your vehicle’s safety and steering system.

1. Must the spare wheel be the exact same make as the other four wheels?

No. The wheels can be of a different make, as long as they are the same size and aspect ratio.

2. Can I drive on the highway with an emergency wheel?

Yes, but keep your speed below 80 km/h and drive cautiously. Remember that an emergency wheel is not designed for longer distances and should be replaced as quickly as possible

3. Can I fit an emergency wheel on my car if I am towing a trailer or caravan?

If you’re towing a caravan or trailer and get a puncture, then it’s usually fine to fit an emergency spare on the car. It is important that you drive directly to a fitment centre to have your wheel fixed and replaced.