From the Super Mario Wiki
The Zipper is Waluigi's second standard kart from Mario Kart DS. It is a Chopper-styled motorcycle. The kart is well-balanced. It is the first bike-like vehicle to appear in the Mario Kart series, though it is treated like a kart. The Zipper has the same speed as the Standard DS, the same handling as the B Dasher, Light Dancer, Brute, Standard WR, Light Tripper, Dragonfly and Standard PC and the same weight as the B Dasher, Streamliner, Standard WL, Standard DK, Royale and Brute.
The kart is unlocked for Toad and Wario as well when the player gets gold trophies in all Nitro or Retro Courses in 150cc, and becomes available for everyone else when gold trophies are obtained in every cup in Mirror Mode.
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