Compliance is critical to avoid customs seizures. For the US market, bikes must meet EPA (Environmental Protection Agency) emissions standards and CPSC (Consumer Product Safety Commission) age-appropriateness guidelines. For the European market, look for CE Marking and compliance with the Machinery Directive 2006/42/EC. If the bike is intended for street use (dual-sport), it must have DOT (US) or E-Mark (EU) certification for lights, tires, and mirrors. Always request ISO 9001 factory certification to ensure consistent manufacturing quality.