not sure about that. the old mechanical ones just showed mileage -= odometer or mileometer. nott he same as the computers that can work out average speed, time, etc,
I believe that a block is freewheel, a cassette is a new, different part. A block/freewheel screws onto the hub and has the ratchet built into it, a cassette is a splined fitting and does not have the ratchet built into it
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