Sportneer Bike Lock
4.6Editor score
17mm Shackle Thickness
Includes 5ft Steel Cable
Weighs 1.64 Pounds
In this guide
Electric bikes are growing in popularity but require robust security due to their high value and portability. A Large U Lock for E Bike provides the necessary strength to deter thieves while accommodating bulky frames and accessories securely.
We analyzed ten leading models based on shackle thickness, locking mechanisms, and user feedback to ensure you find a reliable solution. Each product was vetted for durability, resistance to common theft tools, and compatibility with various bike types and parking scenarios.
Every selection here highlights specific strengths like heavy-duty steel construction or convenient mounting options to help you decide. Please note that product availability and pricing can fluctuate over time so check current listings before making your final purchase.
Top 3 Picks for Best Large U Lock for E Bike
NDakter Bike Locks Heavy Duty
4.7Editor score
18mm Hardened Steel Shackle
3 Backup Brass Keys Included
Dust Cover Protection
Kryptonite New York Long Shackle
4.7Editor score
16mm Max-Performance Steel
Sold Secure Gold Rated
Anti-Theft Protection Offer
Top 10 Best Large U Lock for E Bike in 2026 Compared
The following table offers a side-by-side comparison of all ten products to help you quickly identify key differences in size, weight, and security ratings for your specific needs.
ProductsSpecificationsEditor scorePrice
Best Budget
Sportneer Bike Lock
17mm Shackle
7.76×5.02 Inches
1.64 Pounds
Steel Cable Included
4.6Editor score
Editor's Choice
NDakter Bike Locks
18mm Shackle
7.8×9.2 Inches
4.4 Pounds
Chain Included
4.6Editor score
Best Premium
Kryptonite New York Standard
16mm Shackle
Compact Size
High Security
FlexFrame Bracket
4.6Editor score
Kryptonite New York Long
16mm Shackle
4×10.25 Inches
4.85 Pounds
Sold Secure Gold
4.7Editor score
NDakter Bike Locks Heavy Duty
18mm Shackle
7.8×9.2 Inches
3.4 Pounds
Steel Cable Included
4.7Editor score
NDakter Combo Bike Lock
14.6mm Shackle
7.5×4.5 Inches
2.82 Pounds
Combo Lock
4.4Editor score
Bike Lock Long Shackle
Long Shackle
Mounting Bracket
4ft Cable
Keyed Design
4.5Editor score
KOHLBURG Highest Security
14mm Shackle
6.7×13.5 Inches
3.3 Pounds
Sold Secure Diamond
4.4Editor score
Kryptonite Evolution Mini-7
13mm Shackle
3.25×7 Inches
3.55 Pounds
FlexFrame Bracket
4.5Editor score
Kryptonite Kryptolok
12.7mm Shackle
4×9 Inches
3.65 Pounds
Sold Secure Silver
4.6Editor score
1. Sportneer Bike Lock – Best Budget Large U Lock for E Bike
Sportneer Bike Lock
17mm Shackle
Steel Cable Included
1.64 Pounds
Mounting Bracket
The Sportneer Bike Lock stands out as a highly accessible option for electric bike owners looking for solid protection without breaking the bank. With a rating of 4.6 from users it offers a balance of affordability and functional security features suitable for daily commuting needs.
Pros
- Lightweight and portable
- Includes 5ft cable
- Affordable price point
- Silicone coating protects frame
- Two keys included
Cons
- Smaller shackle than others
- Basic cylinder design
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Its 17mm shackle provides decent resistance against basic cutting tools while the included 5ft steel cable adds versatility for securing wheels or accessories. The silicone coating helps prevent scratches on your frame and the mounting bracket ensures easy transport on the bike itself.
While it lacks the heavy-duty reinforcement of premium models the polygonal design and zinc alloy core offer reasonable defense against opportunistic theft. The weight of just 1.64 pounds makes it one of the lightest options in this roundup which is ideal for riders carrying extra gear.
This lock is best suited for moderate risk environments where budget is a primary concern but security cannot be compromised. It is a practical choice for students or commuters who need a reliable lock that is easy to carry and use every day.
Affordable Security Features
The zinc alloy lock core and alloy steel lock head provide strong resistance against hydraulic shear forces up to 12 tons for the price.
Easy Installation and Use
The included mounting bracket fits bike tubes with a diameter under 26mm to 38mm allowing for effortless attachment to the frame.
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2. NDakter Bike Locks Heavy Duty Anti Theft – Best for Heavy-Duty Chain Large U Lock for E Bike
NDakter Bike Locks Heavy Duty Anti Theft
18mm Shackle
6mm Chain
4.4 Pounds
3 Keys Included
NDakter Bike Locks Heavy Duty Anti Theft brings serious muscle to the table with its 18mm hardened steel shackle and robust 6mm chain. This lock is built for those who need to secure high-value e-bikes or multiple bikes simultaneously with confidence against advanced theft attempts.
Pros
- Thick 18mm shackle
- Strong manganese steel chain
- Three keys provided
- Weatherproof design
- Versatile for multiple bikes
Cons
- Heavy at 4.4 pounds
- Lacks mounting bracket
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The heavy-duty 3T manganese steel chain offers superior protection compared to standard cables resisting cutting and lever attacks effectively. The ergonomic double-open design allows easy access while the zinc alloy cylinder prevents technical opening and ensures long-term durability in outdoor conditions.
At 4.4 pounds this unit is on the heavier side which might be a consideration for riders with strict weight limits. However the three brass keys and weatherproof silicone protector add significant value and convenience ensuring your bike stays safe from elements and thieves alike.
Ideal for parking high-risk locations or securing fat-tire bikes this lock provides comprehensive protection where standard options fall short. It is a powerful choice for riders who prioritize maximum security over portability and need a solution that can handle tough environments.
Heavy Duty Anti Theft Protection
The 18mm hardened steel shackle withstands cutting and lever attacks effectively making it suitable for motorcycles and heavy e-bikes.
Ergonomic Design and Keys
Includes three strong brass keys that resist bending and provide peace of mind against loss or lockouts.
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3. Kryptonite New York Standard – Best Premium Large U Lock for E Bike
Kryptonite New York Standard Heavy Duty U-Lock
16mm Shackle
Max-Performance Steel
Anti-Rotation Features
Disc-Style Cylinder
The Kryptonite New York Standard represents the gold standard in premium bike security offering top-tier protection against cutting and leverage attacks. With a 4.6 rating this model is engineered for high-value bikes in high-risk environments where peace of mind is paramount.
Pros
- High-security cylinder
- Sliding dust cover
- Heat-treated steel
- Anti-rotation features
- Includes FlexFrame bracket
Cons
- Premium price point
- Shorter shackle length
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Its patented anti-rotation features on the shackle defend against twist-and-cut attacks while the disc-style cylinder resists picking and drilling. The heat-treated precision-hardened construction ensures long-lasting durability and the included FlexFrame-U bracket makes transport seamless and secure.
While this lock comes at a higher price than budget options the investment pays off in superior integrity and reliability. The sliding dust cover protects the cylinder from debris and the two ergonomic stainless steel keys reduce torque during use preventing breakage over time.
This is the ideal choice for owners of expensive electric bikes who need absolute confidence in their lock's ability to deter theft. It offers robust protection with thoughtful design details that enhance both security and convenience for serious cyclists.
Patented Anti-Rotation Features
Designed to defend against twist-and-cut attacks ensuring the shackle cannot be easily manipulated by thieves.
Highest-Security Disc-Style Cylinder
Resists picking and drilling for maximum lock integrity and is a core component of its reliable theft protection.
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4. Kryptonite New York Long Shackle – Best Long Shackle Large U Lock for E Bike
Kryptonite New York Long Shackle Bike U-Lock
16mm Shackle
4×10.25 Inches
Sold Secure Gold
Key Safe Program
The Kryptonite New York Long Shackle offers exceptional flexibility with its elongated design while maintaining robust security standards. Rated at 4.7 it provides ultimate resistance against cutting and leverage attacks making it a top choice for securing e-bikes in diverse environments.
Pros
- Extra long shackle
- Double deadbolt design
- Sold Secure Gold rated
- Lifetime warranty
- Key replacement program
Cons
- Heavy weight
- No cable included
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Its patented hardened double deadbolt design gives additional protection against twist attacks and the high-security disc-style cylinder resists picking and drilling. The lock is rated 9/10 for ultimate security and includes three keys plus a Key Safe Program for global key replacement.
While it is heavier at 4.85 pounds and lacks a cable the versatility of the long shackle compensates by allowing you to lock around thicker posts or wider frames. The lifetime warranty and customer support ensure long-term satisfaction and protection.
This lock is perfect for riders who need extra reach without compromising on security strength. It is an excellent option for urban commuters or e-bike owners who require a durable, reliable lock with strong manufacturer backing.
Patented Locking System
Features a double deadbolt design that gives additional protection against twist attacks and leverages high-security cylinder technology.
Multi-Functionality
Ideal to secure bicycles sports equipment gates fences tool boxes ladders grills and even truck beds with versatility.
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5. NDakter Bike Locks Heavy Duty Anti Theft – Best Value Heavy-Duty Large U Lock for E Bike
NDakter Bike Locks Heavy Duty Anti Theft
18mm Shackle
6ft Steel Cable
Dust Cover Included
3 Brass Keys
NDakter Bike Locks Heavy Duty Anti Theft combines robust materials with practical features to offer outstanding value for electric bike owners. With a 4.7 rating this model features an 18mm hardened steel shackle that withstands up to 12 tons of hydraulic cutting force for strong defense.
Pros
- 18mm hardened steel shackle
- 6ft steel cable included
- Three keys provided
- Dust cover protection
- Versatile applications
Cons
- Mounting bracket not included
- Slightly heavier
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It includes a 6ft steel cable for added locking flexibility and three solid brass keys to ensure you always have a spare. The dust cover protects the keyhole from debris and the silicone cover helps resist rust and corrosion while preventing frame scratches.
The double deadbolt locking system and zinc alloy cylinder resist cutting sawing drilling and picking attacks effectively. It is designed to secure wide-fork bikes and fat-tire bikes making it ideal for e-bikes and motorcycles in various settings.
This lock is a great choice for riders who need heavy-duty security without paying premium brand prices. Its versatility and included accessories make it a practical and reliable option for daily use or outdoor storage.
Upgraded Size and Security
The 18mm hardened steel shackle withstands up to 12 tons of hydraulic cutting force ensuring strong protection for wide bikes.
Three Backup Keys for Peace of Mind
Includes three solid brass keys that resist bending and breaking so you always have access to your bike.
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6. NDakter Combo Bike Lock – Best Keyless Large U Lock for E Bike
NDakter Combo Bike Lock
14.6mm Shackle
4-Digit Combo
5ft Steel Cable
2.82 Pounds
NDakter Combo Bike Lock offers the convenience of a keyless design with its 4-digit resettable combination system making it easy to lock up without carrying extra keys. With a 4.4 rating it balances affordability and usability for riders who prefer simplicity in their security routine.
Pros
- No keys needed
- Resettable combination
- Lighter weight
- Includes 5ft cable
- Easy to set
Cons
- Lower weight resistance
- No bracket included
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The 14.6mm hardened steel shackle provides solid resistance and the extra 5ft steel cable offers versatility for securing multiple parts of the bike. It weighs only 2.82 pounds which is lighter than many heavy-duty options and the alloy steel head ensures durability.
The combination is easy to set and remember though you must take care to record your new password. It provides excellent anti-theft performance for daily stops and the coated shackle prevents scratches on your valuable electric bike frame.
This lock is best for low to moderate risk areas where key convenience is a priority. It is an excellent solution for casual riders or those who frequently access their bikes and want a lightweight reliable security option.
Keyless Convenience
The 4-digit resettable combo eliminates the need for keys making it convenient without worrying about lost keys or disconnections.
Sturdy and Durable
Weighing 2.82 pounds it is resistant to theft and leverage attacks while remaining easy to carry daily.
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7. Bike Lock Heavy Duty Anti Theft – Best for Commuters Large U Lock for E Bike
Bike Lock Heavy Duty Anti Theft
Long Shackle
4ft Cable
Mounting Bracket
Silicone Cover
Bike Lock Heavy Duty Anti Theft is designed for everyday security with a long shackle that provides more clearance around racks and poles. With a 4.5 rating it is a practical solution for commuters who need a reliable lock for daily outdoor parking in varied environments.
Pros
- Long shackle clearance
- Complete set with bracket
- Silicone cover
- Affordable price
- Keyed design
Cons
- Not rated high security
- Basic cylinder
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It includes a 4ft security cable to help secure the frame and wheel together to a rack and a mounting bracket for convenient transport. The durable shackle and protective silicone cover ensure repeated outdoor use without rusting or scratching your bike.
This model is straightforward and functional offering solid protection for moderate risk areas. The long shackle design makes it more practical than shorter options when accessing tight spaces or thicker bike racks in urban settings.
Best suited for students or riders who need a complete kit without complex features it provides essential security at a reasonable price. It is a practical choice for those who value ease of use and transportability.
Long Shackle Flexibility
The long shackle design gives more clearance around racks poles and fixed objects for more practical daily parking.
Complete Lock Set
Includes a keyed long shackle u lock 4ft security cable mounting bracket and keys for commuting and everyday riding.
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8. KOHLBURG Highest Security U Lock – Best Diamond Certified Large U Lock for E Bike
KOHLBURG Highest Security U Lock
Sold Secure Diamond
14mm Shackle
Multi-Disc Cylinder
4 Keys Included
KOHLBURG Highest Security U Lock stands out with its Sold Secure Diamond certification ensuring protection for high-value bikes in demanding conditions. With a 4.4 rating this lock focuses purely on security using strong available steel and a safe multi-disk cylinder to prevent theft.
Pros
- Sold Secure Diamond certified
- Strong steel construction
- Secure multi-disc cylinder
- Large shackle size
- 2-way mounting bracket
Cons
- Heavy weight
- Premium price
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The shackle diameter of 14mm is heavy-duty and resistant against bolt cutters while the multi-disc cylinder is extremely difficult to pick. The large shackle size and 2-way bracket make locking easier and the included spiral cable helps secure accessories like helmets or trailers.
Weighing 3.3 pounds this lock is a robust choice for serious security needs. The soft protective cover prevents your bike varnish from scratches and the 2-way bracket allows versatile transport even on smaller frames.
This lock is ideal for owners who demand certified maximum protection and prefer minimalistic functional design. It is a reliable partner for e-bike owners looking for a proven barrier against sophisticated theft attempts.
Certified With Sold Secure Diamond
Designed to protect high-quality bikes using the strongest available steel and a safe multi-disk cylinder for top security.
Secure Multi-Disc Cylinder
Extremely difficult for thieves to pick as they need to align several discs at the same time to breach the lock.
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9. Kryptonite Evolution Mini-7 – Best Compact Large U Lock for E Bike
Kryptonite Evolution Mini-7 Bike U-Lock
13mm Shackle
3.25×7 Inches
Sold Secure Gold
FlexFrame Bracket
Kryptonite Evolution Mini-7 is designed for commuters who need a compact lock that does not compromise on core security features. With a 4.5 rating it uses a 13mm hardened Max-Performance steel shackle to resist cutting and leverage attacks while protecting your frame finish.
Pros
- Compact size
- Sold Secure Gold
- Double deadbolt design
- Includes bracket
- Key Safe Program
Cons
- Shorter interior space
- Higher price
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Its double deadbolt design locks the shackle on both sides to prevent twisting and pulling and it is Sold Secure Gold certified. The included 4ft double-loop security cable secures your front wheel and accessories and the FlexFrame-U bracket allows hassle-free transport.
This lock is weather-treated to protect against rust and includes three stainless steel keys with a Key Safe Program for easy replacement. Its compact dimensions make it easier to carry than larger models but still offer reliable protection for daily use.
It is ideal for riders with tight storage or who want a high-security lock that is easy to manage. This option balances size and security well for urban cyclists and e-bike owners.
Built to Last
Constructed with a 13mm hardened Max-Performance steel shackle to help resist cutting and leverage attacks effectively.
Compact Commuter-Friendly Size
Interior locking dimensions of 3.25×7 inches provide a tight fit around bike racks to deter leverage attacks.
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10. Kryptonite Kryptolok Standard – Best Standard Large U Lock for E Bike
Kryptonite Kryptolok Standard Bike U-Lock
12.7mm Shackle
4×9 Inches
Sold Secure Silver
FlexFrame Bracket
Kryptonite Kryptolok Standard offers a reliable everyday lock for commuters seeking balanced security and convenience. With a 4.6 rating it uses a 12.7mm hardened performance steel shackle to resist cutting and leverage attacks while preserving your bike finish.
Pros
- Standard commuter size
- Sold Secure Silver
- Double deadbolt design
- Key Safe Program
- Anti-theft protection
Cons
- Thinner shackle
- Basic cylinder
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Its double deadbolt design locks the shackle on both sides for enhanced holding power and it is Sold Secure Silver certified. The included 4ft double-loop security cable secures your front wheel and accessories and the FlexFrame-U bracket ensures hassle-free transport on your bike.
The lock includes two stainless steel keys backed by the Key Safe Program for easy replacement and is weather-treated to prevent rust. This option provides versatile locking reach for thicker poles and racks at an affordable price point for daily use.
It is ideal for riders who need a standard reliable lock for moderate risk areas without overcomplicating their routine. This model is a practical choice for students or workers looking for trusted Kryptonite security.
Built to Last
Constructed with a 12.7mm hardened performance steel shackle to help resist cutting and leverage attacks effectively.
Standard Commuter-Friendly Size
Interior locking dimensions of 4×9 inches provide a versatile locking reach for thicker poles and racks.
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Buying Guide – How to Choose the Best Large U Lock for E Bike
Choosing the right lock involves understanding several key factors that impact security and usability for electric bikes specifically.
Shackle Thickness and Material
The shackle is the most critical part of a U lock and its thickness determines resistance to cutting tools. Look for hardened steel shackles that are at least 13mm thick to provide a strong barrier against bolt cutters and saws.
A thicker shackle like 16mm or 18mm offers superior protection and is essential for high-value e-bikes. Always check the material specification to ensure it is hardened and heat-treated for maximum durability.
Locking Mechanism and Cylinder
The cylinder is the heart of your lock and should resist picking and drilling. High-security disc-style cylinders or multi-disk systems are highly recommended over basic car key style mechanisms.
Look for features like anti-rotation or double deadbolt designs which prevent twist attacks. A good cylinder will also have a protective dust cover to keep debris out and ensure smooth operation.
Size and Clearance
Large U locks must provide enough interior space to fit your e-bike frame and lock around a post or rack. Measure your bike's frame width to ensure the lock accommodates it comfortably without being too loose.
Consider the dimensions carefully to avoid locks that are too small for your frame or too large for secure parking spots. Some models offer longer shackles to accommodate wider racks or additional accessories.
Weight and Portability
Security locks can be heavy so consider how you will transport it daily. A lighter lock might be convenient but often sacrifices shackle thickness so find a balance that suits your riding habits.
Many models come with mounting brackets to attach the lock to the bike frame for easy access. If portability is key look for models designed with ergonomic shapes that fit well with backpacks or frame mounts.
Security Certifications
Look for independent security ratings like Sold Secure Gold or Diamond which validate the lock's ability to resist theft tools. These certifications provide assurance that the lock meets rigorous testing standards.
Higher certification levels usually indicate better protection but can come with a higher price tag. For high-value e-bikes investing in a certified lock is a wise long-term investment for your peace of mind.
Additional Security Accessories
Many U locks come with cables or chains to secure wheels and accessories not protected by the U shape. These extras increase versatility and help you lock up more parts of your bike to deter theft.
Check if cables are steel or reinforced and if they are weatherproof. A good accessory kit adds significant value and helps protect your investment more comprehensively.
Ease of Use
A lock should be easy to operate without compromising security. Look for smooth locking mechanisms that do not jam easily and keys or combination dials that are simple to use.
Features like ergonomic keys and quick-release mounting brackets improve daily usability. A lock that is too difficult to use might lead to frustration and inconsistent security habits.
Warranty and Support
A strong warranty and responsive customer support provide protection against defects and accidental loss. Some brands offer key replacement programs or theft protection policies that add extra value.
Check the terms of the warranty and availability of replacements. Knowing that the manufacturer stands behind their product adds confidence to your purchase decision.
How to Use and Care for Your Large U Lock for E Bike
When using your lock position the shackle through the bike frame and wheel whenever possible and secure it to a fixed sturdy object. Always ensure the locking mechanism is fully closed and tested before leaving your bike.
Protect your lock from dirt and moisture by wiping it down after exposure to rain or mud. Store it in a dry place when not in use to prevent rust and corrosion on the metal parts.
Keep your keys separate from the lock to avoid losing both at once. If your lock has a dust cover close it after use to protect the cylinder from debris and ensure long-term functionality.
Frequently Asked Questions
What size U lock is best for e-bikes?
For e-bikes a U lock with at least 14mm shackle thickness is recommended to resist cutting tools. The interior dimensions should be large enough to fit your frame and wheel comfortably while maintaining tight security around the lock.
How do I prevent my U lock from rusting?
Regularly clean and dry your lock after exposure to moisture. Applying a light coat of silicone spray or lubricant to the cylinder and shackle helps prevent rust and ensures smooth operation.
Can I use a U lock to secure both frame and wheels?
Yes you can use a U lock for the frame and an additional cable or chain to secure the wheels. Many U locks come with compatible cables that make this two-part security process easier and more effective.
What is the difference between Gold and Diamond security ratings?
Sold Secure Diamond ratings indicate higher resistance to theft tools and attacks than Gold ratings. Diamond locks generally have thicker shackles and more advanced cylinders but cost more than Gold rated options.
How often should I replace my bike lock?
There is no fixed timeline but inspect your lock regularly for wear or damage. If the shackle shows signs of cutting attempts or the cylinder jams frequently it is time to replace it for continued security.
Are combination locks as secure as keyed locks?
Modern combination locks can be quite secure especially with robust materials and internal mechanisms. However keyed locks with high-security cylinders often offer better resistance to picking and should be chosen based on your security needs.
What should I do if I lose my bike lock keys?
Many brands offer key replacement services if you register your lock and keep the key code. If you are locked out you may need to contact a professional locksmith or replace the lock entirely.
Is a U lock better than a chain lock?
U locks generally provide better resistance against cutting tools and leverage attacks than chain locks. However chain locks offer more flexibility for different locking scenarios and can be more convenient for certain bike sizes.
Final Thoughts on Choosing the Best Large U Lock for E Bike
The ten products highlighted in this guide offer a range of security features and price points to suit different e-bike owners. From budget-friendly options like the Sportneer to premium choices like the Kryptonite New York Long Shackle there is a suitable lock for every need.
When selecting a lock prioritize shackle thickness and cylinder security to ensure your bike is protected against theft. Consider weight and portability if you carry your lock frequently and look for models that include extra cables for complete bike security.
Always check current availability and pricing before purchasing as these details can change over time. Investing in a high-quality U lock will provide long-term peace of mind and help keep your valuable electric bike safe wherever you park it.