We are very sorry when this happens. It does occassionally happen and it's something out of our control. It may be caused by cycling through some glass for example. You have to walk the bike back to us or bring it on a train or in a taxi (black cabs can take bikes). We repair the puncture free of charge/or exchange you for another bike. You must not ride on a flat tire- this damages the wheel. If you ride on a flat tire, you may have to pay for a wheel repair or a new wheel.
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