Caps are a piece of piss to replace.
PCBs are not - they often need to be programmed / flashed, and that can only be done by proprietary kit by authorised service people. And paid for obvs.
@NotThamesWater started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Caps are a piece of piss to replace.
PCBs are not - they often need to be programmed / flashed, and that can only be done by proprietary kit by authorised service people. And paid for obvs.