The profile of the teeth completely redesigned in line with the ultra drive project makes it possible to achieve the maximum response speed at the moment of shiftingthe synchronisation obtained by establishing a specific position of the teeth inter sprocket makes the passage from one sprocket to the next very fluid and fastand in order not to lose rigidity the last two are fitted on an aluminium frametechnical specificationssteelultra drivesingle sprocketsnickel chromed finishsupplied wit