Master Lock Bike Lock Cable with Combination Black, 8143D

Product Overview

The Master Lock 8143D Preset Combination Cable Lock delivers reliable, everyday security with the convenience of keyless access. Designed primarily for bicycles but versatile enough for other outdoor gear, this 4-foot cable lock combines strength, flexibility, and protective features to help deter theft without compromising on practicality. Its preset four-digit combination eliminates the hassle of lost keys while offering a straightforward locking mechanism ideal for casual riders and commuters alike. The braided steel core provides solid resistance to cutting attempts, and the vinyl coating ensures your bike’s finish stays scratch-free—even during frequent use or tight storage spaces. Backed by Master Lock’s Lifetime Guarantee, this lock reflects the brand’s reputation for dependable, long-lasting security solutions.

Key Features

• Preset Four-Digit Combination: No keys needed—just dial in the factory-set code for instant access. This feature is especially useful for users who prefer simplicity or frequently lend their bikes to others.
• 5/16 in. (8 mm) Braided Steel Cable: Engineered for both strength and flexibility, the braided construction resists cutting while allowing the cable to wrap around handlebars, wheels, frames, or fixed objects with ease.
• Vinyl-Coated Exterior: The smooth vinyl shell not only protects the internal steel from moisture and wear but also shields painted surfaces—like carbon fiber frames or clear-coated finishes—from scuffs and scratches.
• 4-Foot (1.2 Meter) Length: Ample reach lets you secure multiple components at once or anchor your bike to posts, racks, or gates without feeling constrained.
• Lifetime Guarantee: If the lock fails due to normal use or manufacturing defects, Master Lock will replace it at no cost—reflecting confidence in the product’s durability.

Technical Specifications

• Lock Type: Preset Combination Cable Lock
• Cable Diameter: 5/16 inch (8 mm)
• Cable Length: 4 feet (1.2 meters)
• Core Material: Braided Steel
• Exterior Coating: Protective Vinyl
• Combination System: Four-digit preset (non-changeable)
• Included Items: One (1) cable lock

Benefits & Use Cases

This cable lock excels as a secondary or supplementary security tool rather than a standalone anti-theft solution. While it won’t stop determined thieves with specialized tools, its visible presence often discourages opportunistic theft—especially in low-risk environments like campus bike racks, backyard storage sheds, or short-term parking spots. The 4-foot length offers strategic flexibility: loop it through both wheels and the frame, attach it to a heavy-duty post, or even secure ladders, grills, or sports equipment when needed.

Its lightweight design makes it easy to carry onboard or store in a backpack without adding bulk. For daily commuters or students who park briefly between classes, the preset combination means no fumbling for keys—just dial and go. The vinyl coating adds real-world value by preventing contact marks on delicate surfaces, which is particularly helpful if you regularly chain your bike to metal railings or wooden structures.

Because this model uses a fixed combination set during manufacturing, it’s best suited for users comfortable with not being able to reset the code themselves. If you prefer customizable security or frequently share access with others, consider models with user-programmable combinations—but for most casual users seeking reliable, no-fuss protection, the 8143D strikes an excellent balance between function and convenience.

Important Notes

• The combination is preset at the factory and cannot be changed by the user. Ensure you record the code immediately upon purchase and keep it in a safe place.
• This lock is intended for light- to moderate-duty use and should not be exposed to prolonged moisture or extreme temperatures, though the vinyl coating helps resist typical weather exposure.
• Always inspect the cable and dial mechanism before each use. If the lock shows signs of damage—such as cuts in the vinyl or misaligned dials—discontinue use and request a replacement under the Lifetime Guarantee.
• Only one lock is included per package; mounting hardware or carrying cases are not provided unless explicitly listed in the packaging.