ROCKBROS Folding Bike Lock 4-Digit Combination — Compact 33.5" Reach, Mount Included

ROCKBROS Folding Bike Lock with Mount is a compact, 4-digit combination folding lock that offers heavy-duty alloy security and a convenient frame bracket for everyday cycling use.

Whether you commute, ride for fitness, or travel with a folding bike, this ROCKBROS lock blends portability and protection. It uses a resettable 4-digit code, a reinforced alloy body and chain sections, and an ABS-wrapped finish to protect your paint while resisting casual theft attempts. The folding design collapses to a pocket-sized shape and includes a mount that fastens to a frame for on-bike transport.

How secure is the 4-digit combination against theft?

The lock uses a resettable 4-digit mechanism with around 10,000 possible codes, combined with a zinc alloy cylinder and six thickened alloy steel chain links for mechanical strength. It’s designed to deter opportunistic thieves and protect your bike in everyday situations.

• 10,000 code combinations for customizable access
• Zinc alloy lock cylinder for tamper resistance
• Six thickened alloy steel segments for cutting and leverage resistance
• 360° rotating lock head for easier alignment when closing

How portable is this lock for commuting or travel?

The folding layout compresses the lock to a compact block, making it easy to carry by hand, stash in a bag, or attach to the included mount. At roughly 1.05 kg (2.31 lbs) and dimensions about 19.3×8.9×3.6 cm when folded, it balances weight and portability for daily use without feeling unwieldy.

• Compact folded size fits small bags or panniers
• Lightweight 1047 g construction suitable for daily carry
• Mounting bracket included for frame attachment with straps or screws
• ABS wrap prevents scratches when mounted or handled

Will this lock fit my bike and how do I mount it?

The ROCKBROS folding lock extends to approximately 33.5 inches when unfolded, allowing you to secure a frame and wheel to fixed objects. The package includes a bracket that can be fixed to the bike frame using screws or secured with two hook-and-loop straps, but confirm clearance on smaller children's bikes before purchasing.

• 33.5-inch reach for wrapping around frames, wheels, and posts
• Bracket fits most adult road, mountain, folding, and commuter bikes
• ABS-wrapped links protect paint and finish
• Not recommended for many kids' bikes—check tire and frame gap first

How easy is it to use and reset the code?

Operation is straightforward: align the digits to your set code and rotate the lock head to open or close. The initial factory code is 0000 and you can reset it to a personal 4-digit combination when you follow the included reset steps, so you won’t need a key.

• Initial preset code: 0000 for quick first use
• Resettable 4-digit mechanism—no key to lose
• 360° rotating head simplifies locking in tight spaces
• Clear tactile digits for quick dialing outdoors

Who is this for? The ROCKBROS Folding Bike Lock with Mount suits commuters, urban riders, and folding-bike owners who need a balance of portability and robust everyday security. It’s a practical choice for cyclists who prefer a keyless system and want a lock that stows neatly on the frame or inside a bag. If you need maximum high-security protection against heavy-duty attacks, consider pairing this lock with an additional U-lock or chain for extra deterrence.