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  • Measure the outer edge of the tyre bead to bead, take some string, mock up size/shape inflated by holding ends of string rim width apart and making a circle?

  • The tolerances are tight on this bike, my schwalbe g one tyres are allegedly 40mm but come up about 41.5 and just have clearance on the seatstays. Different tyres seem to assume different shapes when inflated up.

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