What does 149 stamped on chain mean?

The number "149" stamped on a chain typically indicates the chain's pitch size, which in this case is 1/4 inch (or about 6.35 mm) between the links. This measurement is crucial for compatibility with specific bike components, particularly in bicycles and motorcycles. Additionally, it may refer to the chain's width or other specifications depending on the manufacturer's standards. Always consult the manufacturer's documentation for precise details about your specific chain.