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Some people get confused regarding tyre pressures thinking that the bigger the tyre the more pressure you need but actually it's the opposite way round. A small trailer tyre will probably need around 50-60 psi. whereas a huge tractor tyre will only require about 15 psi. The calculatuion is based on pounds per 'SQUARE INCH' and there are more square inches in volume in the larger tyre than the smaller one thus the small tyre needing the extra pressure because the are less square inches in volume. So judging by the comments of Hyundai, their advice on the tyre pressures for your vehicle I would consider is accurate and correct. Also, have a look at the tyre wall and see what the maximum pressure allowed is as this will also give you a guide as to the correct tyre pressures.
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