SeatyLock Mason U-Lock - Black

The inner shackle width is 11.7 cm, making it suitable for wider E-bike frames and other large-diameter bicycle components.

The lock comes supplied with 3 keys and a registration card.

Yes, the lock features a hardened steel triangulated shackle, a double deadbolt locking mechanism, and an anti-drilling key cylinder, offering a high level of security.

No, the lock features a soft polymer lock shell designed to protect your bike's finish from scratches.

The lock is constructed with rust-free hardened steel. To maintain it, keep the lock clean and dry, and store it in a sheltered location when possible. Periodic dry lubrication of the cylinder can also help.

The unique triangulated design of the 15.3 mm shackle provides an excellent strength-to-weight ratio, offering robust security without being excessively heavy.

Yes, the lock is supplied with a registration card, allowing you to register your keys for potential replacement if lost.

Ensure the key is fully inserted. Try cleaning the keyhole with compressed air or a dry lubricant like graphite powder. Avoid using oil-based lubricants which can attract dirt.

Verify that the shackle is fully engaged and the lock mechanism is not under tension. Ensure you are using the correct key and it is inserted fully and straight.

Check for any obstructions in the shackle path or the locking mechanism. Ensure both sides of the shackle are aligned correctly before attempting to close.

Clean the exterior with a damp cloth and apply a dry lubricant to the key cylinder. Store the lock indoors when not in use to prolong its life.