The legal tread depth for motorcycle tires can vary depending on the country or region. In general, the minimum legal tread depth for motorcycle tires is typically around 1.0 to 1.6 millimeters (mm). However, it's important to note that this can vary, and it's always advisable to check the specific regulations of your country or region, as they may have different requirements.

Additionally, while the legal minimum tread depth is a good guideline for ensuring safety, it's generally recommended to replace tires before they reach the minimum legal limit. Tires with deeper treads provide better grip and traction, particularly in wet or slippery conditions. Regularly inspecting your motorcycle tires and replacing them when the tread depth starts to wear down significantly is important for maintaining safe riding conditions.