ROCKBROS 829 Folding Combination Bike Lock 85cm High-Security Manganese Steel 4-Digit Resettable Code Frame Mount Black

Forged from high-strength manganese steel alloy with stainless steel rivets, the ROCKBROS 829 folding lock delivers serious cut, drill, and saw resistance in a compact, keyless package. The 85cm articulated length wraps around frame, wheel, and anchor, while the resettable 4-digit combination eliminates key loss forever. A rubberized ABS coating shields your paint from scratches and shrugs off weather and corrosion. The included frame bracket grips tubes from 20 to 42mm, so the lock rides along without rattling.

Overview

The ROCKBROS 829 is a folding combination lock engineered for cyclists who demand both security and convenience. Its articulated steel links extend to 85cm, giving you enough reach to lock the frame and front wheel to a solid anchor. The 4-digit combination is fully resettable, so you can choose a code that’s easy for you to remember but hard for thieves to guess. The lock body and links are made from manganese steel alloy, known for its resistance to cutting, drilling, and sawing. Stainless steel rivets at each joint add extra strength, while the ABS plastic coating keeps the lock quiet during transport and prevents paint damage.

What stands out

• Keyless 4-digit combination — no keys to lose or break, and the code can be reset anytime.
• High-security manganese steel links resist bolt cutters, saws, and drills.
• Folding design compresses to a small bundle that mounts directly to your frame.
• Rubberized ABS coating is weatherproof and protects your bike’s finish.

Technical details

• Lock type: Folding combination lock
• Locking mechanism: 4-digit resettable combination
• Material: High-strength manganese steel alloy
• Coating: Rubberized ABS plastic
• Effective locking length: 85 cm
• Security level: High (anti-theft, anti-drilling, anti-sawing, anti-shearing)
• Mounting: Frame-mounted bracket (included), fits tubes 20–42 mm diameter
• Color: Black
• Weather and corrosion resistant
• Keyless operation
• Stainless steel rivets
• Application: Bicycles, electric bikes, scooters

Our verdict

The ROCKBROS 829 folding lock strikes an excellent balance between security and portability. Its manganese steel construction and resettable combination offer peace of mind without the hassle of keys, while the included bracket keeps it out of the way until needed. A solid choice for urban cyclists and commuters.