More likely they had to put a new piece of tin in the exchange because the old unit was end of life/support and your upgrade was a byproduct
Sorry, more likely than what?
@Scilly.Suffolk started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
More likely they had to put a new piece of tin in the exchange because the old unit was end of life/support and your upgrade was a byproduct