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What is the maximum I can inflate my tyres to stop them flatting when in storage over the winter?

My Mazda MX-5 is covered for the winter and wired to my battery charger, so I cannot move it. The tyres are Bridgestone Portenza 205-45R17 84W CKC4509. What is the safest maximum I can inflate them to lessen tyre flatting?

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The maximum cold tyre pressure should be printed on the sidewall. If you're storing for more than a month, we'd recommend disconnecting it from the battery charger and rolling the tyres. If you really can't do that, there are some anti-flat spot cradle gadgets you can buy - although we've got no experience of using them. If you do decide to over inflate don't forget to let the extra air out.
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