There is no single "best" cycling game for the Wii, but several titles offer enjoyable experiences depending on what you are looking for.
EA Sports Active: More Workouts: Features structured cycling workouts with varying intensity levels and supports the Wii Fit Balance Board for immersion.
Wii Fit Plus: Includes a cycling mini-game that works well for quick, casual exercise sessions.
Wii Fit: The original title also has a cycling mini-game, though it is simpler than the Plus version.
Excitebike: World Challenge: Offers an arcade approach with distinct tracks, tricks, and challenges rather than realistic simulation.
Mario Kart Wii: While a kart racer, it includes a motorcycle class that handles differently from karts and provides competitive multiplayer fun.
Availability: Physical copies can be hard to find and may be expensive.
Controls: Motion-heavy controls may not suit everyone's precision or comfort preferences.
Content Preference: Decide if you want a fitness tool, an arcade racer, or a party game.
For a wider selection of modern cycling simulators, consider platforms like Nintendo Switch or PC.