Introduction
The Kryptonite Keeper Standard U-Lock is designed to provide robust security for your bicycle and other valuable items. Featuring a 12mm hardened steel shackle and a double deadbolt anti-rotation design, this lock offers resistance against common theft methods. Its disc-style cylinder is engineered to be pick and drill resistant, ensuring reliable protection. This manual provides essential information for the proper setup, operation, maintenance, and troubleshooting of your U-lock.

Image: The Kryptonite Keeper Standard U-Lock, a robust security device for bicycles.
Product Overview
Key Features
- High-Security Design: Constructed with a 12mm hardened steel shackle for resistance against cutting and leverage attacks.
- Double Deadbolt: New hardened double deadbolts engage both shackle ends, increasing holding power.
- Disc-Style Cylinder: Features a pick and drill resistant disc-style cylinder with a center keyway.
- Protective Coating: Durable vinyl coating around the shackle helps prevent scratching and wear on your bicycle.
- Ergonomic Keys: Includes two stainless steel keys with an ergonomic design to reduce torque and prevent bending or breaking.
- Versatile Use: Suitable for securing bicycles, sports equipment, gates, fences, toolboxes, ladders, grills, lawnmowers, skateboards, and truck beds.

Image: A detailed view highlighting the 12mm hardened performance steel shackle, new hardened double deadbolts, and the lock's dimensions (4in x 8in) and weight (2.05 lbs).

Image: Two stainless steel keys with an ergonomic design, included with the Kryptonite Keeper U-Lock.
Setup
Mounting the Bracket
The Kryptonite Keeper Standard U-Lock includes a versatile Side Mount, Snap-In Bracket for convenient transport. This bracket allows you to securely attach the U-lock to your bike frame without the need for a bag or backpack.
- Identify a suitable location on your bike frame (e.g., seat tube, down tube) that does not interfere with pedaling or other bike components.
- Position the bracket on the frame and use the provided hardware to secure it firmly. Ensure the bracket is tight and stable.
- To attach the U-lock, align the shackle with the bracket's slot and snap it into place. Ensure it clicks securely.
- To remove the U-lock, press the release button on the bracket and slide the lock out.

Image: The included Side Mount, Snap-In Bracket for attaching the U-lock to a bicycle frame.

Image: The Kryptonite Keeper U-Lock securely mounted on the frame of a bicycle for transport.
Operating Instructions
Locking Your Bicycle
- Find a secure, immovable object to lock your bicycle to, such as a bike rack, lamppost, or sturdy fence.
- Remove the shackle from the crossbar by inserting the key and turning it to unlock.
- Position the U-lock to secure both the bicycle frame and at least one wheel to the immovable object. Aim to fill as much of the U-lock's space as possible to minimize leverage points for thieves.
- Reinsert the shackle into the crossbar, ensuring both ends are fully engaged.
- Turn the key to the locked position and remove it. Wiggle the shackle to confirm it is securely locked.
Unlocking Your Bicycle
- Insert the key into the lock cylinder.
- Turn the key to the unlocked position.
- Carefully pull the shackle away from the crossbar.
- Remove the U-lock from your bicycle and the immovable object.
- Store the lock securely, preferably using the included mounting bracket.
Video: Product Overview demonstrating the basic locking and unlocking mechanism of the Kryptonite Keeper U-Lock.
Maintenance
Regular maintenance ensures the longevity and smooth operation of your Kryptonite Keeper U-Lock.
- Lubrication: Periodically apply a small amount of graphite-based lubricant or a silicone spray to the keyway and locking mechanism. This helps prevent corrosion and ensures smooth key insertion and turning. Avoid oil-based lubricants as they can attract dirt.
- Cleaning: Wipe down the lock body and shackle with a damp cloth to remove dirt and grime. The vinyl coating protects against scratches, but keeping it clean helps maintain its integrity.
- Key Care: Keep your keys clean and free of debris. Avoid forcing the key if it feels stiff; apply lubricant to the keyway first.
- Storage: When not in use, store the lock in a dry environment to prevent moisture buildup and potential rust, especially if exposed to rain or humidity.
Troubleshooting
If you encounter issues with your Kryptonite Keeper U-Lock, consider the following:
- Key is Stiff or Won't Turn: This is often due to dirt or lack of lubrication in the keyway. Apply a graphite-based lubricant or silicone spray directly into the keyway. Insert and remove the key several times to distribute the lubricant. Do not force the key, as this can damage the lock or break the key.
- Shackle is Stuck: Ensure the key is fully inserted and turned to the unlocked position. Sometimes, tension on the shackle can make it difficult to remove. Try wiggling the bicycle or the lock slightly to relieve pressure. If the lock has been exposed to extreme weather, ice or rust might be an issue; apply a de-icer or lubricant.
- Lock Mechanism Feels Gritty: This indicates internal dirt or corrosion. Follow the lubrication steps mentioned in the Maintenance section. If the problem persists, professional servicing may be required.
- Lost Keys: If you have registered your keys with the Kryptonite Key Safe Program, you can request replacements. Refer to the Warranty and Support section for details.
Specifications
| Feature | Detail |
|---|---|
| Brand | Kryptonite |
| Model Name | Keeper 12 Standard |
| Model Number | 004196 |
| Lock Type | U-Lock |
| Shackle Material | Hardened Steel |
| Shackle Diameter | 12mm |
| Interior Locking Dimensions | 4 in. x 8 in. |
| Weight | 2.05 lbs |
| Special Feature | Weather Resistant |
| Included Components | U-Lock, Mounting Bracket, 2 Keys |
Warranty and Support
Kryptonite stands behind the quality of its products with comprehensive support programs.
Limited Lifetime Warranty
The Kryptonite Keeper Standard U-Lock is covered by a Limited Lifetime Warranty, ensuring protection against manufacturing defects. For specific terms and conditions, please refer to the official Kryptonite website or contact customer support.
Key Safe Program
Register your keys online with the Kryptonite Key Safe Program. In the event of lost keys, Kryptonite can provide two replacement keys for an additional shipping and handling fee. This program ensures you always have access to your lock even if your original keys are misplaced.

Image: Information about the Kryptonite Key Safe Program, allowing online key registration for replacement services.
Anti-Theft Protection Offer (ATPO)
The Anti-Theft Protection Offer (ATPO) is an optional service available for premium Kryptonite locks rated 5/10 and above on their security scale. The Keeper Standard U-Lock is rated 5/10. ATPO requires registration, additional information, and fees. It provides added protection if your vehicle is stolen due to a compromised lock. This offer is optional and not automatically included with purchase.

Image: Kryptonite's security rating chart, indicating the appropriate security level for various environments and durations.
Customer Support
For further assistance, product inquiries, or to register your lock for the Key Safe Program or ATPO, please visit the official Kryptonite website or contact their customer service department.