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Puncture (flat tyre)

If you complete a cycling tour without suffering a single puncture then consider yourself lucky! Since the rear wheel takes most of your weight and the rear pannier weight, it is usually this wheel's inner tube that punctures (and is also the more complicated of the two because of the rear derailleur and chain).

If it's raining, try to find some shelter. Deflate the punctured tyre completely, and if it's a rear tyre puncture turn the bicycle upside down with the saddle on the ground, having removed the panniers. This also protects the rear derailleur from getting damaged.

Puncture repair, Gorges du Tarn (Route 8)

To remove the rear wheel, shift the derailleur to the smallest cog on the freewheel/cassette and innermost front chain ring. Remember where the axle sits in the dropouts. Release the wheel's quick-release (if your bicycle has them), otherwise loosen both nuts either side of the dropouts. Pull the rear derailleur back to allow the cogs to clear the chain. Lift the wheel (you may have to pinch the tyre either side of the brake pads to slip the tyre between them) and pull it forwards to clear the chain and derailleur. If tyres are fat you will probably have to release cantilever brakes or V brakes in order to pull the tyre past the brake pads.