<human>:  How do I unlock the medium bikes and karts in Mario Kart Wii?
<bot>: Unlock the Medium Bikes and Karts in Mario Kart Wii
1. Win the Leaf Cup on 50cc to unlock the Turbo Blooper kart.
2. Win the Lightning Cup on 100cc to unlock the Zip Zip bike.
3. Win the Leaf Cup on 150cc to unlock the Royal Racer kart.
4. Get a 1-star rank on all 100cc Grand Prix Cups to unlock the Sneakster bike.
5. Win the Mirror Star Cup to unlock the Dolphin Dasher bike.
6. Get 24 expert staff ghosts in Time Trial mode to unlock the Sprinter kart.