Sidekick Compact U-Lock Blue - Lightweight Heavy Duty Bike Lock

In this review the OTTOLOCK Sidekick Compact U-Lock in blue is evaluated for riders who want practical security without the bulk of a traditional U-lock. The bottom line: this small, silicone-coated U-lock is best for commuters, students, and casual riders who need a lightweight deterrent they can carry easily in a backpack or pocket. Its main selling point is portability combined with hardened steel construction that gives real peace of mind for short stops.

Key Features

• Compact, portable design: The small footprint and 750 gram weight make it simple to carry in a bag or hang from a frame without adding significant load.
• Hardened double-shackle steel: The 12mm double-shackle construction and antirotation deadbolt provide a sturdy defense against opportunistic theft.
• Silicone-coated body: The soft silicone coating protects paint and prevents frame scratches while still allowing the lock to be used frequently.
• Generous opening for single-tube locking: The 2.75 in x 5.75 in opening accommodates most single tube-to-post situations for quick stops.
• Three keys included: Comes with three keys so riders can keep a spare set at home, on a keyring, or with a trusted companion.

Who It's For

The Sidekick is ideal for city commuters, students, and recreational riders who make short to medium-length stops and need a lock that is easy to carry all day. Its lightweight nature and compact dimensions suit anyone who prioritizes mobility and convenience over the maximal security of a full-size U-lock.

Riders who need long-term, high-security parking in high-risk areas should consider pairing the Sidekick with a secondary chain or cable lock or choosing a larger U-lock designed for extended unattended parking. Also, if you need to lock both wheels and the frame to a fixed object, a larger lock or additional device may be preferable.

Pros & Cons

Pros

• Light enough at about 1.65 lbs to carry without strain on longer rides.
• Silicone coating prevents scratching and protects the frame during regular use.
• Solid feel from the 12mm hardened steel and antirotation deadbolt makes it a credible theft deterrent.
• Three keys included reduce the risk of being locked out after a day of riding.

Cons

• The compact opening is a little small for some locking scenarios, so it may not fit larger frames or allow double-wheel locking.
• While sturdy, it is best used as a primary deterrent for short stops or paired with another lock for extended security.

Specifications

Our Verdict

The OTTOLOCK Sidekick Compact U-Lock in blue is a smart choice for riders who need a balance of lightweight convenience and dependable deterrence. It delivers good build quality, frame protection, and portability at a reasonable value, though riders who leave bikes in high-risk locations should add a second lock or choose a larger model. Overall, it is excellent value for everyday urban use.

Frequently Asked Questions

Is the Sidekick easy to carry on a bike?
Yes, at about 1.65 lbs it fits easily in backpacks, bags, or pockets and can hang from many frames without heavy weight.

Will the silicone coating damage my paint?
No, the silicone coating is designed to protect the frame and prevent scratches during regular use.

Can it secure both wheels and the frame?
The opening is sized for locking a single tube to a post; for both wheels and frame you may need a larger lock or a second lock.