Heavy-Duty Chain Lock

- Security
- Primary
ROCKBROS 3.2FT Heavy Duty Bike Chain Lock
A 17.19mm hardened steel chain lock with dual unlock: 4-digit combo or 2 keys.
U-locks, chains, folding locks, and cable locks. A cable lock is a second lock, never your only lock.
Security
Bike LocksRead the full buying guide for bike locks before you shop.
This page contains affiliate links. If you buy through one, we may earn a commission at no extra cost to you. Learn more.
Heavy-Duty Chain Lock

A 17.19mm hardened steel chain lock with dual unlock: 4-digit combo or 2 keys.
Frame + Wheel Double-Lock Set

A U-lock and 4ft steel security cable set for double-locking your frame and wheel.
Everyday Commuter U-Lock

A 22mm heat-treated steel U-lock with a silicone cover, mounting bracket, and 4ft cable.
Compact Portable Folding Lock

An ABS-and-zinc-alloy folding lock that collapses compact for mounting on bikes, e-bikes, or motorcycles.
mooncool Trike & Bike Owners

A heavy-duty chain lock with a protective outer cover, built to fit mooncool trikes and bikes.
Keyless Smart Lock

A keyless U-lock that unlocks with a phone tap or NFC card, no keys needed daily.
Disc Brake Alarm Lock

A press-to-lock disc brake lock with a 110dB motion alarm and reminder cable.
Budget Secondary Lock

A lightweight 5-dial combination cable lock, easy to set and reset with no keys.
Lightweight Secondary Lock

A lightweight, self-coiling 6ft combination cable lock with a resettable code.
Backup Theft Recovery, Alongside a Real Lock

A working bike bell that hides an Apple AirTag inside, so your bike is trackable through Find My even if a lock fails.