6500 is not 6600.. :)
former is 9spd octalink-hollowtech1 latter is 10 spd external bearing bb-ht2
@Halbert 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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6500 is not 6600.. :)
former is 9spd octalink-hollowtech1
latter is 10 spd external bearing bb-ht2