ROCKBROS Folding Bike Lock 4-Digit Combination — Compact 33.5" Steel Links with Handlebar Mount

This folding bike lock combines a resettable 4-digit code, a robust alloy body, and a compact folding design so you can lock and go without fumbling for keys. At roughly 33.5 inches when extended and folding down to a pocketable size, it balances portability with strong theft deterrence. The ABS-coated links protect your bike's finish while the included bracket keeps the lock attached to your frame for everyday rides.

How does the 4-digit combination make locking simpler?

The lock uses a resettable 4-digit mechanism with about 10,000 possible combinations so you won’t need a key and can personalize the code to something memorable. The rotating 360° dial design is engineered for quick visual alignment and smooth operation even when you’re in a hurry.

• Initial code set to 0000 and easy to reset to your chosen sequence.
• Combination dial rotates 360° for faster locking and unlocking.
• No keys to lose—ideal for commuters and shared bikes.

How strong is the lock against theft attempts?

Construction pairs a zinc alloy lock cylinder with an alloy steel body and six thickened steel folding links for a durable, cut-resistant barrier. While no lock is invincible, this design effectively discourages casual opportunistic thieves and prevents quick grab-and-run thefts.

• Six thickened steel links form a compact, hard-to-cut chain substitute.
• Zinc alloy cylinder plus alloy steel body for increased resistance.
• ABS cover prevents scratches while maintaining strength.

Will it fit my bike and how portable is it?

The lock extends to 33.5 inches for wrapping around frames, wheels, and secure anchor points, and folds down to roughly 7.6 × 3.5 × 1.4 inches for storage. It weighs about 1047 grams (2.31 lbs), offering a practical balance between security and daily-carry comfort.

• 33.5-inch length when unfolded for flexible locking options.
• Compact folded size fits neatly on many frames or in a bag.
• Includes a mounting bracket with screw and hook-and-loop strap options.

How does the mounting bracket work and protect the bike finish?

The package includes a storage bracket that mounts to your frame using screws or attaches with two hook-and-loop straps for tool-free installation. Each link is wrapped in ABS material so the lock won’t scuff paint or metal parts while riding or when secured to the frame.

• Bracket supports secure attachment to most bicycle frames.
• Screw or strap installation lets you choose a stable or removable mount.
• ABS-wrapped links prevent scratches and reduce rattling noise.

Who is this for: The ROCKBROS Folding Bike Lock suits commuters, urban cyclists, and folding-bike owners who want a no-key, portable security solution that minimizes scrapes to their paint. It’s ideal for riders who value quick operation, the convenience of a frame-mounted lock, and a physical deterrent strong enough for everyday urban use. Note: check tire-frame clearance on some children’s bikes before purchasing to ensure compatibility.