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4 Speed X4 Upgrade
Brompton 4-speed X4 upgrades / mods. Reuse your old wheelset (C Line) and expand to #WiderThanPTLine 4-speed gear range.
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GBP
Brompton 4-speed X4 upgrades / mods. Reuse your old wheelset (C Line) and expand to #WiderThanPTLine 4-speed gear range.
