Yes. I have 245 40/19s Continental Sports contact 6s on my 206. It is legal for the rim size, according to JAX, confirmed in RTA regs. 245s are a common size to fit hold-ons, fords & a lot of other makes in Australia. Hence they are more readily available, more choice of makers & variants at significantly cheaper price per wheel than 235s.
There is an old thread in here somewhere in which the math of the difference to 235s was agonized over by the forum professors for a week. In short, when brand new, inflated to 38psi, the tyres will indicate just on 2kms higher at 100kph. That still leaves you 3kms under the real speed limit of 100kph because ADRs mandate manufacturers must adjust speedos to read 5% higher than your real speed. IE: You will still be 3kph below the actual speed limit at 100kph. Of course, as they wear, the difference becomes nothing.
I've also got a full size spare with 245 fitted. It fits about 12mm high in the wheel well, after trimming the intrusive bit of flat plastic trim across the rear of the wheel well. Purists have kittens about this but with the boot floor in place I'm yet to find anyone, including Skoda mechanics doing services, who even notice a difference. Better than the billy cart wheel Skoda supply as a spare, if you are a regular traveler.
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