• You are using the 'valve on last' technique are you? This is where you fit the second bead working towards the valve, periodicaly resettling the bead already fitted in the centre of the rim, so releasing that oh-so-vital extra amount of unfitted bead so that the final click is right by the valve. And don't be shy about pushing the valve into the body of the tyre, otherwise it tends to lock the yet to be fitted bead out. And also to keep a small amount of air in the tube, so that it doesn't get pinched.

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