Tyre replacement

If the tyre is worn evenly, a tread wear indicator will appear as a solid band across the tread. This shows there is less than 1.6 mm (1/16 in) of tread left on the tyre. Replace the tyre when this happens.
Do not wait for the band to appear across the entyre tread before replacing the tyre.

When replacing the tyres, recheck and tighten the wheel nuts after driving about 50 km (31 miles) and recheck after driving about 1,000 km (620 miles). If the steering wheel shakes or the vehicle vibrates whilst driving, the tyre is out of balance. Align the tyre balance. If the problem is not solved, contact a professional workshop. Kia recommends to visit an authorised Kia dealer/service partner.

We recommend that when replacing tyres, use the same originally supplied with the vehicles.
If not, that affects driving performance.

Replacing tyres
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Driving on worn-out tyres is very hazardous and will reduce braking effectiveness, steering accuracy, and traction.
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Your vehicle is equipped with tyres designed to provide for safe ride and handling capability. Do not use a size and type of tyre and wheel that is different from the one that is originally installed on your vehicle. It can affect the safety and performance of your vehicle, which could lead to handling failure or rollover and serious injury.When replacing the tyres, be sure to equip all four tyres with the tyre and wheel of the same size, type, tread, brand and load-carrying capacity.
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The use of any other tyre size or type may seriously affect ride, handling, ground clearance, stopping distance, body to tyre clearance, snow tyre clearance, and speedometer reliability.
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It is best to replace all four tyres at the same time. If that is not possible, or necessary, then replace the two front or two rear tyres as a pair. Replacing just one tyre can seriously affect your vehicle's handling.
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The ABS works by comparing the speed of the wheels. Tyre size can affect wheel speed. When replacing tyres, all 4 tyres must use the same size originally supplied with the vehicle. Using tyres of a different size can cause the ABS (Anti-lock Brake System) and ESC (Electronic Stability Control) to work irregularly.