Compact, tough and ready for everyday city use – the Trelock U4 Mini ZB 401 combines a 14 mm hardened steel shackle with drill-protected cylinder and 12/18 security rating. Reliable protection in a practical, space-saving format.
When you need solid everyday bike security without carrying oversized hardware, the Trelock U4 Mini ZB 401 hits the sweet spot.
The 14 mm hardened steel shackle delivers strong resistance against cutting attempts, while the drill-protected cylinder adds an extra layer of security where it matters most. With a security rating of 12/18 on the Trelock scale, this U-lock is a dependable choice for daily use in urban environments and medium-risk areas.
Its compact internal dimensions of 83 x 152 mm make it easy to secure your bike frame to racks, railings or other fixed objects, while keeping the lock practical to transport. A sliding dust cover protects the locking mechanism from dirt and moisture, helping maintain smooth operation over time.
The rubber coating prevents scratches on your bike frame, and the included ZB 401 mounting bracket allows convenient transport directly on your bike. Keys are included in the set, and additional keys can be ordered via the official TRELOCK website if needed.
Simple, solid and purpose-built – this is everyday security you can trust.
Technical specification
Product type: Bicycle U-lock
Model: Trelock U-lock U4 Mini ZB 401 83-152
Security level: 12/18 (Trelock scale)
Material: Hardened steel
Shackle diameter: 14 mm
Internal dimensions: 83 x 152 mm
Color: Black
Weight: 800 g
Cylinder: Drill-protected
Lock protection: Sliding cover against dirt and moisture
Coating: Rubber cover to prevent frame scratches
Mounting bracket: ZB 401 included
Keys: Included
Additional key option: Yes – via TRELOCK website
Intended use: Securing city, trekking, MTB and gravel bikes for everyday use
Shipping:
We ship within Poland, across the entire European Union, and worldwide