Bike Chain Locks

Match security to theft risk: use lighter, shorter chain locks for low-risk areas or quick stops, and heavy, thicker chained locks (with hardened links and a robust cylinder) for high-risk urban or overnight storage; also consider lock length, weight, and insurance requirements

Look for hardened steel or boron-alloy links, protective fabric sleeves to prevent frame scratches, a pick- and drill-resistant cylinder, and welded or riveted link construction; these features improve cut- and tamper-resistance

Prices typically range from budget options under $50 for basic chains to $100–$200 or more for heavy-duty, high-security models; the category average price is near (price varies), so higher-cost locks generally offer greater weight and stronger materials

Heavier chains generally offer more security but are less convenient to carry; balance by choosing a chain length and thickness that fits your ride style and storage options, or use a heavy chain for parked/stationary use and a lighter lock for daily transport

A practical chain length is typically 3 to 6 feet (90–180 cm): long enough to secure both frame and rear wheel to various fixed objects but short enough to minimize weight and make carrying manageable

Keep the lock clean and dry, periodically lubricate the keyway with graphite or a dry lubricant, inspect for rust or damage, and store indoors when possible; replace locks that show significant corrosion or compromised links

Check whether the lock’s weight and shape fit your bike’s mounting options or pannier, and whether included mounting brackets or carriers are compatible; also verify the lock length works with the types of street furniture you commonly use