Bicycles must adhere to strict safety regulations depending on the destination. For the European market, compliance with EN ISO 4210 (for city, trekking, mountain, and racing bikes) and EN 15194 (for EPAC/e-bikes) is mandatory. For the U.S. market, products must meet CPSC 16 CFR Part 1512 requirements. If sourcing children's bicycles, ensure they pass ASTM F963 and CPSIA lead and phthalate testing. Always request CE, GS, or UL certifications from the manufacturer to avoid customs seizures and legal liabilities.