ROCKBROS Folding Bike Lock 4-Digit Combination with Mount — Lightweight Alloy-Steel Foldable Security

ROCKBROS Folding Bike Lock is a compact, foldable 4-digit combination lock with a sturdy alloy-steel body and included mounting bracket for convenient, keyless bike security.

This folding lock combines convenience and toughness in a travel-friendly package. Its resettable 4-digit mechanism eliminates keys, the multi-segment alloy-steel design folds flat for easy storage, and a supplied bracket lets you carry it on your frame. The ABS-covered links protect paint while the zinc-alloy cylinder and six thickened steel chains raise resistance to casual theft attempts. Dimensions and weight balance portability with deterrent strength for everyday riders.

How secure is the 4-digit combination compared with a keyed lock?

The lock uses a resettable 4-digit code with roughly 10,000 combinations, removing the need to carry a physical key and lowering the risk of key loss. A zinc-alloy lock cylinder and reinforced alloy-steel links give the lock solid mechanical resistance against quick tampering.

• Resettable 4-digit code (initial 0000) with ~10,000 possibilities
• Zinc-alloy cylinder plus alloy-steel lock body for increased toughness
• Six thickened steel chain segments to resist prying and cutting attempts
• 360° rotating lock head for faster alignment and operation

Will this folding lock fit my bike and how portable is it?

The lock folds compactly to minimize space on the frame and includes a mounting bracket with screw or Velcro strap options for stable transport. When folded it measures about 7.6 × 3.5 × 1.4 inches and weighs approximately 1047 g, making it comfortable to carry on commutes or stashed in a bag.

• Foldable design for compact storage on or off the bike
• Mounting bracket attaches via screws or hook-and-loop straps
• Compact dimensions and balanced weight for handheld use and packing
• ABS-wrapped links protect frame finish while locked

What bikes and situations is this lock best suited for?

This folding lock works well for road bikes, mountain bikes, folding bikes, and many motorcycles where there is enough clearance to loop the segments. It’s designed to stop opportunistic thieves and secure your bike during short stops or in moderate-risk areas; check your bike’s tire gap to ensure compatibility with the folded segments.

• 33.5-inch length lets you secure frame and wheel to fixed objects
• Suitable for everyday urban commuting and quick errands
• Not ideal for high-risk long-term parking or some children’s bikes with narrow gaps
• ABS coating prevents paint damage while locked

How do I set and use the combination safely?

The lock ships with an initial code of 0000 and can be reset to a custom 4-digit code for personal security. The rotating lock head makes it easy to align digits and engage the mechanism; keep your chosen code private and record it in a secure place in case you forget.

• Initial code: 0000 — resettable to a personal 4-digit number
• 360° rotating head simplifies dialing and locking/unlocking
• Store your code securely to avoid lockouts
• Regularly check mechanism and coating for wear to maintain function

Who this is for: Riders who want a balance of everyday portability and practical theft resistance will appreciate this ROCKBROS folding lock. It suits commuters, folding-bike owners, and cyclists who prefer a keyless, compact solution that protects their frame finish and packs neatly on the ride. If you need the heaviest industrial-grade security for long unattended parking, combine this lock with additional security measures for greater protection.