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Wii Karts

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digdat0 edited this page Nov 14, 2026 · 2 revisions

Convert WiiMK Karts (beta), in the MKDD-NX Tools app, turns a Mario Kart Wii kart into an extra kart. Bikes aren't supported.

Download

MKDD-NX Tools, from the latest release: MKDD-NX-Tools.exe (Windows), MKDD-NX-Tools-arm64.dmg (Mac, Apple Silicon) or MKDD-NX-Tools-x86_64.dmg (Mac, Intel). Open the Convert WiiMK Karts tab.

Convert

  1. Wii kart file: Browse… and pick the .szs, usually from a Kart folder (Race/Kart/), named like sa_kart-kk.szs. On Windows you can also drop it on the window.
  2. Disc image: your own .iso or .gcm, only read. It's needed to fit the Wii kart to a Double Dash one.
  3. Check Name, Author and Source link, and read the notes under the pictures.
  4. Added next to: the Double Dash kart it joins, which sets how it drives. By Wii kart (default) reads the kart from the file name. Size %, Up and Forward adjust the fit; Convert again shows the result.
  5. Output folder: pick switch/MKDD-NX/mods/karts/ on the SD card, or a folder to copy there later, then Write kart folder….
  6. Turn on Mods > Extra Karts in the − menu, then Restart now.

Which kart it drives like

The size in the Wii file name sets the weight class, and each Wii kart has its own base, chosen for how well its size fits:

Wii kart Base Wii kart Base Wii kart Base
sa Booster Seat Paratroopa ma Classic Dragster Birdo la Offroader Wario
sb Mini Beast Toad mb Wild Wing Waluigi lb Flame Flyer Wario
sc Cheep Charger Baby Luigi mc Super Blooper Mario lc Piranha Prowler DK
sd Tiny Titan Bowser Jr. md Daytripper Luigi ld Jetsetter King Boo
se Three-Wheeler Toadette me Sprinter Yoshi le Honeycoupe Petey
sdf Standard S Koopa Troopa mdf Standard M Peach ldf Standard L DK

This matches class and size, not how the kart drove on the Wii. A file name without a Wii kart gets a warning and the base nearest in size. Bowser's and Diddy Kong's karts have six wheels: pick them by hand, and the Wii tires are used on all six.

Many at once

To convert many karts (and drivers) together, use the Batch WiiMK tab: see Wii Characters.

Limitations

  • Karts only, no bikes.
  • The wheels in the preview are placed by eye: the game puts them where the base kart's go.
  • Beta: tested on a range of karts, but not every model out there. If one looks wrong, open an issue with the file's name and where it's from.

Command line

py -3 tools/wiikart.py IN.szs OUT_FOLDER --iso GAME.iso [--base NAME] [--name NAME] [--author A] [--source URL]

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