Diamond rated large security u-lock
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Gold rated medium bicycle u-lock
Pentagon Locks
Gold rated medium bicycle u-lock
Updated 2026-09-05
Balancing size and strength, this medium-format u-lock is Sold Secure Gold certified for high-level theft prevention. The 8.66 in shackle length offers a versatile fit for most standard bicycle frames and urban infrastructure. It provides a significant upgrade in security for riders moving from basic cables to professional-grade protection.
The keyed mechanism is designed for precision and durability, resisting environmental debris and attempted lock picking. The hardened steel shackle is thick enough to deter most manual cutting tools, making it a formidable obstacle for thieves. It is specifically recommended for e-bike users who need reliable security in city centers.
The portable design allows for easy storage in a backpack or via a frame mount. Its construction focuses on high-tensile strength while maintaining a weight that won't significantly impact ride quality. This lock serves as a dependable primary security measure for daily commuters and weekend enthusiasts alike.
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Keyed bike locks Electric scooter locks Motorcycle grade locks Heavy duty U-locks High security bike locks Locks for electric bikes