This is the Serpent SL6 XLI 2-Speed Set, for use with the Serpent 748. Michael Salven designed a super light gearbox to achieve lower inertia for extreme racing conditions - the Xli, or Xtra Low Inertia.
The adapter, shoes and bell on the Xli are all reduced in size and feature a lower mass which gives better acceleration overall. The well proven 2-speed gears remain the same as before. Current 748 Natrix and 747 racers can easily upgrade to this new Xli SL6 gearbox for the competitive edge.
This product was added to our catalog on May 26, 2015