How to factory reset the Brompton advance 4 speed gearing
Please note from October 2023 a running production change means the bigger sprocket on the cassette will be 20t not 18. Electric C Line produced after October 2023 come supplied with the Advance 4 speed gear system. Please note: the pinch bolt must be tightened to 4Nm. For more help: https://www.brompton.com/support/4spe...
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Brompton 4 speed Advance gearing system
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Brompton 4 speed derailleur gear adjustment
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