How to Use a Bike Lock: U-Locks, Combination, Cable and Chain
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Bike locks are simple, but each type works a little differently. This guide covers how to operate the most common locks. For where to put the lock on your bike, see how to properly lock a bike, and for picking a spot, how to lock your bicycle.
Table of Contents
How to Use a Key U-Lock
- Insert the key and turn it to release the shackle (the U-shaped bar).
- Pull the shackle out of the crossbar.
- Pass the shackle around your bike and the rack.
- Push the shackle ends back into the crossbar until you hear or feel both sides click.
- On most locks, remove the key. Some locks need the key turned back first.
- Tug the shackle to make sure it’s latched.
- BUILT TO LAST: The Kryptonite Kryptolok Standard U‑Lock is constructed with a 12.7mm hardened performance steel shackle to help resist cutting and leverage attacks, while a durable vinyl‑coated protective sleeve prevents scratches to your bike’s frame and preserves its finish
- DOUBLE-DEADBOLT DESIGN: Locks the shackle on both sides of the crossbar for enhanced holding power and resistance against twisting and pulling. Certified by Sold Secure Silver, it also includes a high‑security disc‑style cylinder to resist picking and drilling
- VERSATILE SECURITY WITH 4‑FT CABLE: Includes a heavy-duty 10mm x 4‑ft (120 cm) double‑loop security cable ideal for securing your front wheel, helmet, or accessories. Together with the U‑lock, it is perfect for securing bicycles and e‑bikes at work, school, or around town
- STANDARD, COMMUTER-FRIENDLY SIZE: This U-lock features interior locking dimensions of 4” x 9” (10.2cm x 22.9cm) and a total lock weight of approximately 3.65 lbs (1.66 kg), providing a versatile locking reach for thicker poles and racks. Weather-reated components help protect against rust and outdoor exposure for reliable everyday use
- EASY MOUNTING BRACKET INCLUDED: Comes with a secure FlexFrame‑U bracket that attaches directly to your bike frame for hassle‑free transport—allowing you to carry the lock easily with no backpack or lock bag required
The Kryptonite KryptoLok Standard (about $80) is a typical key U-lock.
How to Use a Combination Lock
- Line up the dials to your code, usually against a mark on the lock body.
- Pull the lock open.
- To set a new code on a resettable lock, follow the maker’s instructions. This usually means opening it with the current code and pressing or turning a reset point.
- After locking, scramble the dials so the code isn’t visible.
Write your code down somewhere safe. Combination locks are convenient, but most offer less security than a good key U-lock.
How to Use a Cable Lock
- Unlock the cable with the key or code.
- Thread one end through your front wheel, then around the frame or your U-lock.
- Lock the loop end into the lock head.
- VERSATILE BIKE LOCK: Master Lock 8143D cable bike lock helps secure bicycles, e-bikes, scooters, strollers, grills, kayaks, outdoor gear and more; Ideal for everyday bike security and basic theft deterrence
- PRESET COMBINATION LOCK: Bicycle lock features a preset four-digit combination for keyless convenience; Combination bike lock provides quick, easy security without carrying keys
- BRAIDED STEEL CABLE: Bike cable lock is made with braided steel for strength and flexibility; Protective vinyl coating helps prevent scratches on bikes, scooters and gear
- COMPACT SECURITY CABLE: Bike lock cable measures 4 ft. (1.2 m) long with a 5/16 in. (8 mm) diameter, offering flexible reach for locking bicycles, scooters and outdoor equipment to fixed objects
- OUTDOOR CABLE LOCK: Durable anti-theft bike lock is designed for everyday outdoor use; Portable cable lock is a convenient security solution for bikes, electric scooters, recreational gear and outdoor equipment
Use a cable as a second lock for wheels and accessories, not as your only lock.
How to Use a Chain Lock
- Thread the chain through your frame and rear wheel.
- Wrap it around the rack or post.
- Pull it tight so there’s little slack, and lock both ends with the padlock.
- Keep the padlock and chain off the ground where possible.
How to Use the Mounting Bracket
Most U-locks and folding locks come with a frame bracket. Fit it on the seat tube or down tube, tighten the straps or screws, and clip the lock in. Check it doesn’t rub your legs while pedaling. Many riders carry the lock in a bag or rear rack instead, which is fine too.
Lock Care Tips
- Lubricate the keyway and latch regularly. Kryptonite’s lock maintenance guide suggests about every two months as a starting point, more often in rain, snow or salt. It recommends a dry lube and notes that standard WD-40 is a solvent, not a lubricant.
- Keep the spare key at home and record any key number the lock came with.
- Replace a lock that sticks or doesn’t latch fully.
Which Lock Should You Use?
For most riders, a hardened U-lock plus a front-wheel cable is the best combination. Compare models in our guide to the best bike locks or check how much a bike lock costs.
FAQ
How do you close a U-lock?
Push both ends of the shackle fully into the crossbar until they latch, then remove the key and tug to check.
How do I reset a bike combination lock?
Most resettable locks are opened with the current code, then a reset button or lever is pressed while you set the new code. Steps vary by model, so check the maker’s instructions.
Why won’t my bike lock key turn?
Dirt or rust is a common cause. Clean the keyway and try a dry lock lubricant. If it still sticks, contact the lock maker.
