OTTOLOCK Sidekick Compact U-Lock — Orange, lightweight 12mm double-shackle with silicone coating

The OTTOLOCK Sidekick Compact U-Lock is a lightweight, silicone-coated U-style bicycle lock that uses double-shackle 12mm hardened steel and an antirotation deadbolt to protect a single tube to a post without the bulk of a traditional U-lock.

Designed to bridge the gap between cable locks and heavy-duty U-locks, the Sidekick prioritizes portability while offering meaningful resistance to opportunistic theft. At only 750 grams (1.65 lbs) and with a 2.75" x 5.75" (7 cm x 14.5 cm) opening, it slips into backpacks, panniers or larger pockets, and comes in a bright orange finish that boosts visibility. Each lock ships with three keys and a silicone-coated body to prevent frame scratches.

How secure is the Sidekick compared with standard U-locks?

The Sidekick uses a double-shackle design crafted from 12mm hardened steel and an antirotation deadbolt, which offers greater cut and pry resistance than basic cable locks. While it’s lighter than full-size hardened U-locks, the Sidekick is engineered to deter opportunistic thieves and is best paired with a secondary lock for longer stops in high-risk areas.

• Double-shackle 12mm hardened steel resists basic cutting attempts.
• Antirotation deadbolt reduces leverage attacks on the lock core.
• Best used for quick stops or combined with another lock for extended security.

How easy is the Sidekick to carry and use daily?

Portability is the Sidekick’s main advantage: it weighs roughly 1.65 lb and has compact external dimensions that fit into many backpacks, messenger bags, or deep pockets. The bright orange color makes it easy to locate, and three included keys mean you can keep spares at home or with a trusted companion.

• Compact footprint: 2.75" x 5.75" opening for common tube-and-post locking.
• 750 g (1.65 lb) keeps load light for commuters and travelers.
• Three keys included for convenience and backup access.

Will the Sidekick damage my bike frame or finish?

No — the Sidekick’s body is wrapped in a high-quality silicone coating designed to cushion contact and prevent scratching. The coating also improves grip when handling the lock and adds weather resistance to the lock exterior without adding significant bulk.

• Silicone-coated body protects paint and reduces rattling.
• Smooth finish prevents abrasive contact during transport or storage.
• Bright finish increases visibility and acts as a visual theft deterrent.

When should I use this lock alone or with a second lock?

The Sidekick shines for brief stops in low- to moderate-risk locations where portability matters, such as quick errands, cafés, or school drop-offs. For longer parking durations, crowded urban centers, or overnight storage, add a heavier chain or U-lock to secure both wheels and the frame for layered protection.

• Use solo for short-duration, low-risk parking.
• Combine with a cable or chain to lock wheels and frame for longer stops.
• Recommended extra lock in high-theft areas or overnight situations.

Who is this for: The OTTOLOCK Sidekick Compact U-Lock suits commuters, students, parents, and anyone who needs a balance of security and carry comfort. It’s ideal for riders who want more protection than a cable lock without the weight and inconvenience of a full-size U-lock, and for households that prefer a bright, easy-to-handle option for kids or new cyclists.