Master Lock Cable Lock Keyed Bike Lock 6 ft - Adjustable Security

Our review of the Master Lock Cable Lock (8155D) finds it best suited for cyclists and owners of outdoor gear who need a flexible, weather-resistant option for everyday use. The bottom line: this keyed cable lock offers a long, vinyl-coated braided steel cable and an adjustable locking mechanism that makes securing bikes, ATVs, grills or lawn mowers straightforward, while the rust-resistant lock adds real outdoor durability. It is not a hardened chain lock for high-theft areas, but for convenience and basic theft deterrence it performs well.

Key Features

• Adjustable locking mechanism: The patented adjustable mechanism lets the user set the cable length from 6 in. up to 6 ft. for a snug fit around different items and anchor points.
• Long vinyl-coated cable: The 6 ft. vinyl-coated braided steel cable threads through tight spots and protects paint while offering flexibility to secure multiple items.
• Weather-resistant finish: Both the rust-resistant lock and vinyl coating help the lock withstand outdoor conditions without quickly corroding.
• Pick-resistant keyed cylinder: The integrated keyed lock is designed to resist picking and delivers stronger security than simple combination barrels.
• Includes spare key set: The package includes two keys so a backup is available if one is misplaced.

Who It's For

The Master Lock 8155D is ideal for casual cyclists, commuters who stop frequently, and owners of outdoor gear like kayaks, grills, or lawn equipment who want a flexible locking option that fits odd shapes and anchor points. Its length and adjustable lock make it useful when a U-lock alone won't reach or when securing multiple items together.

It is not the top choice for high-risk urban environments where thieves frequently carry bolt cutters or hacksaws; those users should consider a heavier-duty chain or D-lock. Also, anyone needing a keyless or resettable code lock should look elsewhere, since this model uses a keyed cylinder.

Pros & Cons

Pros

• Flexible 6 ft. braided steel cable threads through frames and around fixed objects for versatile use.
• Vinyl coating protects finishes and increases weather resistance for outdoor storage.
• Adjustable locking mechanism provides a tight fit from 6 in. to 6 ft., reducing slack and bulk.
• Includes two keys for convenience and backup.

Cons

• Some users report occasional key or cylinder issues, so key durability can be mixed in long-term use.
• As a cable lock, it is not as cut-resistant as hardened chain or heavy-duty U-locks in high-theft areas.

Specifications

Brand	Master Lock
Model	8155D
Cable length	6 ft.
Cable diameter	3/8 in. outside diameter
Construction	Braided steel cable with vinyl coating
Lock type	Keyed cylinder with two keys included

Our Verdict

The Master Lock 8155D is a practical, value-oriented cable lock for everyday security needs where flexibility and weather resistance matter. It is best for riders and owners of outdoor equipment who need a long, adjustable cable that protects finishes; however, those in high-risk theft areas should choose a heavier-duty lock for maximum protection.

Frequently Asked Questions

How long is the cable?
The cable extends to 6 ft. and adjusts down to 6 in. using the locking mechanism.

Does it include keys?
Yes, the package includes one adjustable cable lock and two keys for backup.

Is it weather resistant?
The braided steel cable has a vinyl coating and the lock is rust-resistant, which improves outdoor durability.