12 Best Bike Chain Locks for 2026 (Thieves Hate These)
You want a lock that stops thieves dead in their tracks—go for 5-digit combos like the Sportneer or NDakter for keyless convenience, or trusted brands like Kryptonite with disc cylinders and Sold Secure ratings. Look for 7–10mm hardened steel, weather-resistant sleeves, and snug-fit mechanisms.
Tough, portable, and pick-resistant, these locks keep your bike safe. The smartest choices blend durability, smart design, and features that make breaking in a total waste of time.
Quick Overview
- High-security chain locks use 7–10mm hardened steel links and Sold Secure Gold ratings to deter theft.
- Disc-style cylinders resist picking and drilling, offering superior protection against common attack methods.
- Weather-resistant nylon sleeves protect both the chain and bike frame from moisture and scratches.
- 5-digit combination locks provide keyless convenience with up to 100,000 possible codes for security.
- Locks with lifetime warranties and KeySafe registration aid recovery and access if keys are lost.
| Sportneer 5-Digit Bike Chain Lock |  | Best Budget Combination | Chain Thickness: 6mm | Lock Mechanism: 5-digit combination | Length: 3.2ft, 3.6ft, 4ft | VIEW LATEST PRICE | Read Our Analysis |
| Kryptonite Keeper 785 Bike Chain Lock |  | Best Lightweight Security | Chain Thickness: 7mm | Lock Mechanism: Keyed | Length: 2.8 feet | VIEW LATEST PRICE | Read Our Analysis |
| Kryptonite Keeper 712 4-Foot Bike Chain Lock |  | Best Heavy-Duty Chain | Chain Thickness: 7mm | Lock Mechanism: Keyed | Length: 4 feet | VIEW LATEST PRICE | Read Our Analysis |
| Heavy Duty Bike Chain Lock (2.72 Ft) |  | Best Value Pick | Chain Thickness: 4mm | Lock Mechanism: Snap-to-lock with keys | Length: 2.72 ft | VIEW LATEST PRICE | Read Our Analysis |
| NDakter 5-Digit Combination Bike Lock |  | Most Customizable Length | Chain Thickness: 0.16 inch | Lock Mechanism: 5-digit combination | Length: 2.62 ft, 3.2 ft, 4.27 ft, 5 ft, 6 ft | VIEW LATEST PRICE | Read Our Analysis |
| Titanker Heavy Duty Bicycle Lock Chain |  | Best Portable Option | Chain Thickness: 6mm | Lock Mechanism: Snap-to-lock with keys | Length: 3 feet | VIEW LATEST PRICE | Read Our Analysis |
| Kryptonite Evolution 1090 Bike Chain Lock |  | Best High-Security Chain | Chain Thickness: 10mm | Lock Mechanism: Keyed | Length: 3 feet | VIEW LATEST PRICE | Read Our Analysis |
| Titanker 3.3ft Heavy Duty Bike Chain Lock |  | Thickest Chain Available | Chain Thickness: 8mm | Lock Mechanism: Keyed | Length: 3.3 feet | VIEW LATEST PRICE | Read Our Analysis |
| Master Lock 6 ft Cable Lock (8122D) |  | Most Versatile Lock | Chain Thickness: 10 mm | Lock Mechanism: 4-digit combination | Length: 6 ft | VIEW LATEST PRICE | Read Our Analysis |
| Bike Chain Lock 3FT-5FT Heavy Duty |  | Best Multi-Key Set | Chain Thickness: 8mm/0.32 inch | Lock Mechanism: Keyed | Length: 3FT/4FT/5FT | VIEW LATEST PRICE | Read Our Analysis |
| Kryptonite Keeper 785 Bike Chain Lock |  | Top-Rated Moderate Security | Chain Thickness: 7 mm | Lock Mechanism: Keyed | Length: 2.8 feet | VIEW LATEST PRICE | Read Our Analysis |
| Kryptonite 4ft Heavy-Duty Bike Chain Lock |  | Best for E-Bikes | Chain Thickness: 10mm | Lock Mechanism: Keyed | Length: 4 feet | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Sportneer 5-Digit Bike Chain Lock
Looking for a secure, keyless option that makes locking up your bike hassle-free? The Sportneer 5-Digit Bike Chain Lock’s got you covered.
You set your own 5-digit combo—no keys to lose—and it’s tough to crack with 100,000 possible combinations. Its 6mm manganese steel chain resists cutting, while the zinc alloy core adds extra protection.
You’re covered in all weather thanks to a durable polypropylene sleeve that shields your bike’s paint and your hands. At 3.2 to 4 feet, you can lock two bikes or secure gear like e-bikes, gates, or ladders.
Just make sure your frame gap fits the 1.3-inch lock head.- Chain Thickness:6mm
- Lock Mechanism:5-digit combination
- Length:3.2ft, 3.6ft, 4ft
- Weight:Not specified
- Material:Manganese steel, zinc alloy, polypropylene cover
- Security Rating / Certification:Not specified
- Additional Feature:Resettable 5-digit combination
- Additional Feature:Scratch-resistant polypropylene cover
- Additional Feature:Protects bike paint
Kryptonite Keeper 785 Bike Chain Lock
Need a compact, reliable lock for quick stops and last-minute errands? The Kryptonite Keeper 785 Bike Chain Lock’s got your back.
At 2.8 feet long, its 7mm manganese steel chain fights cutting and leverage attacks, while the four-sided links add strength. You’ll appreciate the rubber coating—it keeps your bike scratch-free—and the weather-resistant nylon sleeve that shields against the elements.
The disc-style cylinder’s tough to pick or drill, and the patented end link cuts weak points. Two keys come included, and you can register for ATPO, KeySafe, and lifetime warranty support.
It’s not the heaviest-duty, but at security level 5/10, it’s smart for urban runs.- Chain Thickness:7mm
- Lock Mechanism:Keyed
- Length:2.8 feet
- Weight:1.59 kg (3.50 lbs)
- Material:Manganese steel, rubber coating, nylon sleeve
- Security Rating / Certification:5/10 on Kryptonite scale
- Additional Feature:Patented disc-style cylinder
- Additional Feature:ATPO & KeySafe eligible
- Additional Feature:Four-sided link design
Kryptonite Keeper 712 4-Foot Bike Chain Lock
If portability and versatility top your list, the Kryptonite Keeper 712 4-Foot Bike Chain Lock is your best bet. You get 7mm four-sided hardened steel links wrapped in a durable rubber coating, plus a weather-resistant nylon sleeve to shield your bike from scratches.
The chain stretches to 4 feet (1.7 kg), letting you loop it through frames, posts, or gates securely. Its patented locking system uses a high-security disc cylinder that resists picking and drilling, while the end link design eliminates weak spots.
You even get two keys and access to ATPO and KeySafe programs when you register—max protection made simple.- Chain Thickness:7mm
- Lock Mechanism:Keyed
- Length:4 feet
- Weight:1.70 kg (3.75 lbs)
- Material:Hardened steel, rubber coating, nylon sleeve
- Security Rating / Certification:Not specified
- Additional Feature:120cm extended circumference
- Additional Feature:Hardened deadbolt integration
- Additional Feature:Weather-resistant nylon sleeve
Heavy Duty Bike Chain Lock (2.72 Ft)
This 2.72 ft heavy-duty bike chain lock is the best choice for riders who demand serious security without the hassle of fumbling with combinations. You’ll love the snap-to-lock design—no keys needed to lock, just fast and smooth.
The 4mm alloy steel resists cutting and drilling, while the hardened zinc cylinder shrugs off weather and tampering. With three keys included, you’re covered if one’s lost.
The protective polypropylene cover prevents scratches, rust, and ice buildup, keeping the chain tough in any condition. At 2.72 feet, you can secure up to three bikes or gear like scooters, gates, or BBQs.
Plus, 24/7 support and a 1-year warranty have your back.- Chain Thickness:4mm
- Lock Mechanism:Snap-to-lock with keys
- Length:2.72 ft
- Weight:Not specified
- Material:Alloy steel, polypropylene cloth
- Security Rating / Certification:Not specified
- Additional Feature:Snap-to-lock mechanism
- Additional Feature:Includes 3 keys
- Additional Feature:All-round protective cover
NDakter 5-Digit Combination Bike Lock
Looking for a secure, keyless solution that keeps thieves guessing? The NDakter 5-Digit Combination Bike Lock’s got you covered.
With 10,000 possible codes and a resettable 5-digit combo, it’s easy to set and tough to crack. Its 0.16-inch alloy steel chain resists cuts, while the zinc alloy cylinder blocks drilling.
You’ll love the scratch-proof coating—it shields your frame and handles wear, heat, and ice. Weighing just 0.71 lbs, it’s light but locks down bikes, scooters, or gear to trees, gates, or rails.
Just mind your wheel gap—wrap around frames if needed. Never leave it unattended in high-risk zones.
Simple, strong, and versatile—this lock’s a smart move.- Chain Thickness:0.16 inch
- Lock Mechanism:5-digit combination
- Length:2.62 ft, 3.2 ft, 4.27 ft, 5 ft, 6 ft
- Weight:~0.71 pounds
- Material:Alloy steel, polypropylene fabric
- Security Rating / Certification:Not specified
- Additional Feature:10,000 possible combinations
- Additional Feature:Keyless code convenience
- Additional Feature:Anti-icing fabric coating
Titanker Heavy Duty Bicycle Lock Chain
Need a tough, no-fuss lock that handles more than just your bike? The Titanker Heavy Duty Bicycle Lock Chain’s 6mm steel links resist cuts and outlast weather thanks to a protective sleeve.
At 3 feet long and just 1.4 pounds, it’s portable enough to carry or stow easily. You’ll love the snap-together locking—no key needed to close it.
Two keys come included, so you’ve got a spare. Use it on bikes, scooters, gates, or grills.
A dust cover shields the keyhole from rain and grime. Lubricate regularly to keep it working smoothly.
While highly durable, no lock’s foolproof—always park smart.- Chain Thickness:6mm
- Lock Mechanism:Snap-to-lock with keys
- Length:3 feet
- Weight:1.4 pounds
- Material:Heavy-duty steel, cloth sleeve
- Security Rating / Certification:Not specified
- Additional Feature:Dust cover protection
- Additional Feature:Snap-together locking
- Additional Feature:Regular lubrication tip
Kryptonite Evolution 1090 Bike Chain Lock
Who wouldn’t want a bike lock that combines brute strength with smart design? The Kryptonite Evolution 1090 delivers exactly that.
Its 10mm six-sided manganese steel chain resists cutting and leverage attacks, while the patent-pending pin-less links eliminate weak points. You’ll appreciate the hardened deadbolt integration and pick-resistant disc cylinder—thieves won’t easily crack it.
The weather-resistant nylon sleeve protects your bike’s paint and lets you coil it compactly for easy carry. At 3 feet, it’s long enough for versatile use on bikes, scooters, or gates.
You get three stainless keys for backups. It’s lightweight, tough, and Sold Secure Gold-rated—perfect for smart urban riders.- Chain Thickness:10mm
- Lock Mechanism:Keyed
- Length:3 feet
- Weight:Not specified
- Material:3t manganese steel, nylon sleeve
- Security Rating / Certification:Sold Secure Gold
- Additional Feature:10mm six-sided chain
- Additional Feature:Pin-less link design
- Additional Feature:Sold Secure Gold
Titanker 3.3ft Heavy Duty Bike Chain Lock
If you want a tough, reliable lock that stands up to cutting attacks, the Titanker 3.3ft Heavy Duty Bike Chain Lock is one of the best picks from the “12 Best Bike Chain Locks for 2026 (Thieves Hate These).” Its 8mm thick steel links resist cuts better than thinner chains, and the protective sleeve keeps rust and scratches at bay. You get two keys—one for daily use, one spare—so you’re never locked out.
The lock only lets you remove the key when fully engaged, so you won’t lose it by accident. Weighing 2.5 pounds and portable at 3.3 feet, it’s easy to carry and ideal for bikes, gates, or grills.
Just don’t leave your bike unattended long-term, especially in high-risk areas.- Chain Thickness:8mm
- Lock Mechanism:Keyed
- Length:3.3 feet
- Weight:2.5 pounds
- Material:Heavy-duty steel, cloth sleeve
- Security Rating / Certification:Not specified
- Additional Feature:8mm thick chain
- Additional Feature:Key ejects only when locked
- Additional Feature:2.5-pound heavyweight
Master Lock 6 ft Cable Lock (8122D)
Looking for a versatile, no-fuss lock that’s easy to carry and simple to use? The Master Lock 6 ft Cable Lock (8122D) has you covered.
It’s lightweight at just 1.61 pounds, with a 6 ft braided steel cable coated in vinyl to protect your bike’s finish. You’ll love the four-digit, resettable combination—no keys needed.
Just set your own code and go. It’s perfect for quick stops or securing gear outdoors.
Sure, it’s not the most theft-proof option, but it’s reliable for low-risk areas. With a Limited Lifetime Warranty and over 5,000 glowing reviews, it’s a trusted favorite.- Chain Thickness:10 mm
- Lock Mechanism:4-digit combination
- Length:6 ft
- Weight:1.61 pounds
- Material:Braided steel, vinyl coating
- Security Rating / Certification:Not specified
- Additional Feature:Set-your-own combination
- Additional Feature:Braided steel core
- Additional Feature:Limited Lifetime Warranty
Bike Chain Lock 3FT-5FT Heavy Duty
Need serious protection for your bike without the bulk? This 3FT–5FT heavy-duty chain lock’s got you covered.
At 2.87 lbs, it’s lightweight but tough, thanks to 8mm heat-treated high-carbon steel links that resist bolt cutters. The zinc alloy cylinder won’t jam and includes a dust cover for durability.
You’ll get three keys plus a handy cloth sleeve to protect your bike’s finish. Use it not just on bikes, but for motorcycles, gates, or fences—whatever needs securing.
The 3FT length wraps easily around your frame or fits in a backpack, while longer options give extra reach—all without sacrificing strength. Thieves won’t like your odds.- Chain Thickness:8mm/0.32 inch
- Lock Mechanism:Keyed
- Length:3FT/4FT/5FT
- Weight:2.87 lbs
- Material:High carbon structural steel, cloth sleeve
- Security Rating / Certification:Not specified
- Additional Feature:Includes 3 keys
- Additional Feature:Flexible cloth sleeve
- Additional Feature:Dust cover included
Kryptonite Keeper 785 Bike Chain Lock
Who’s after a compact, reliable lock that won’t weigh you down but still stands up to tampering? The Kryptonite Keeper 785 Bike Chain Lock’s your pick.
At 33.5 inches long with a 7 mm four-sided hardened steel chain, it fights cuts and leverage attacks. You get two keys and a high-security disc cylinder that resists picking and drilling.
Its end link design locks directly to the hardened deadbolt—no weak spots. A weather-resistant nylon sleeve and rubber coating protect your bike’s finish.
Weighing just 3.5 lbs, it’s light but tough. Rated 5/10 for moderate security, it’s ideal for everyday use and backed by Kryptonite’s Anti-Theft Protection.- Chain Thickness:7 mm
- Lock Mechanism:Keyed
- Length:2.8 feet
- Weight:~2.9 pounds
- Material:3T manganese steel, rubber coating, nylon sleeve
- Security Rating / Certification:5/10 on Kryptonite scale
- Additional Feature:33.5″ chain length
- Additional Feature:Color options available
- Additional Feature:3T manganese steel
Kryptonite 4ft Heavy-Duty Bike Chain Lock
Why settle for less when your e-bike demands top-tier protection? The Kryptonite 4ft Heavy-Duty Bike Chain Lock gives you serious security with its 10mm six-sided hardened steel chain and reinforced oval lock head.
You get Sold Secure Gold rating, an 8/10 on Kryptonite’s scale, and a disc-style cylinder that resists picking and drilling. Its 4-foot length wraps large frames and thick posts easily.
Rubber coating and nylon sleeve prevent scratches. It’s heavy at 6.8 lbs, but you’ll sleep better knowing it guards your e-bike, scooter, or gate.
Three keys, ATPO, and KeySafe support mean you’re covered if trouble hits.- Chain Thickness:10mm
- Lock Mechanism:Keyed
- Length:4 feet
- Weight:3.08 kg (6.8 lbs)
- Material:Hardened steel, rubber coating, nylon sleeve
- Security Rating / Certification:Sold Secure Gold, 8/10 on Kryptonite scale
- Additional Feature:47.25″ circumference
- Additional Feature:Sliding dustcover protection
- Additional Feature:E-bike friendly design
Factors to Consider When Choosing Bike Chain Locks
You need a chain thick enough to resist cutting, so aim for at least 12mm. Check the lock’s mechanism—disc detainer cores are tougher to pick and more reliable.
Don’t forget weather resistance, portability, and whether it’ll fit your usual bike setup.
Chain Thickness
Most bike chain locks range from 4 to 10 mm in thickness, and your best bet for solid protection usually falls between 7 and 10 mm. You’ll want that extra meat on the chain—thicker links (8–10 mm) resist bolt cutters way better than flimsy 4 mm ones.
Sure, they’re heavier, but if you’re locking up in a high-risk area, the weight’s worth it. Just keep in mind, beefier chains demand stronger lock heads and may limit what you can loop through.
You’ll also find that a six-sided link design makes it harder for thieves to grab the chain with leverage tools, even at the same thickness. Don’t just go for slim because it’s light—4 mm chains cut way too easily.
Balance matters: 7–10 mm gives you tough defense without turning your commute into a workout.
Locking Mechanism
How secure is your lock really? It depends on the locking mechanism.
If you hate fumbling for keys, go for a 5-digit keyless reset combo—convenient, but don’t forget the code. Prefer foolproof security?
Choose a lock with a disc-style cylinder; it resists picking and drilling better than most. You’ll also want an end-link design that connects the chain to a hardened deadbolt—no weak spots for thieves to exploit.
Some models offer snap-to-lock operation, letting you secure your bike fast without keys, though they may limit pass-through flexibility. Either way, look for built-in dust covers, nylon sleeves, or weatherproof coatings that keep dirt out and ensure the cylinder works smoothly over time.
You’re not just locking your bike—you’re locking it right.
Weather Resistance
Why let rain, snow, or dust cut your lock’s life short? Don’t.
Choose a chain lock with a weather-resistant nylon sleeve—it shields the chain from moisture, rust, and dirt while you ride or park outdoors. These sleeves also protect your bike’s paint from scratches when the chain rubs against the frame.
Look for models with dustproof caps over the keyhole, too; they block grime and water, keeping the locking mechanism smooth and reliable. You’ll get longer performance, even in harsh climates, when the lock’s built with protective coatings and sealed casings.
You’re not just buying security—you’re investing in durability. A covered chain resists corrosion and keeps working like new, year after year.
Skip flimsy, exposed designs. You want toughness that lasts, so make sure your lock can take the weather without failing on you.
Portability
You’ve protected your lock from the elements—now make sure it fits seamlessly into your daily rides. For everyday use, go with a lighter chain, around 2.72–3.3 ft and 4–8 mm thick; it’s easier to carry and less strain on your ride.
If you need more security, expect bulk—longer, thicker chains (3–4 ft, 7–10 mm) add weight and reduce portability. Look for a model with a protective sleeve and weather-resistant coating—it’ll hold up better when tossed in a bag or strapped to your frame.
Compact, coiled designs or those with integrated carry handles beat loose, heavy chains you’ll dread lugging around. Also, grab a lock with 2–3 keys; losing one while out won’t leave you stranded.
Prioritize lightweight, slick transport features so your lock works with your routine—not against it.
Compatibility
What good is a tough chain lock if it won’t fit where you need it most? You’ve got to check the pass-through gap—make sure the lock head and chain can slide through your bike’s spokes, frame openings, or a fence post.
Don’t guess; measure first. Think about length: can it wrap one bike and a post, or two bikes together?
Add up the total circumference when closed. Match chain thickness—7 to 10 mm—to your risk level, and pick four- or six-sided links for better leverage resistance.
Confirm the head and diameter fit tight anchor points. Wrapping around trees or thick objects?
Verify it’s safe and effective. Read compatibility notes—you might secure a motorcycle, gate, ladder, or scooter.
Don’t assume. Check every detail so your lock works where it matters.
Frequently Asked Questions
Can Bike Chain Locks Be Cut With Bolt Cutters?
Yes, you can cut some bike chain locks with bolt cutters if they’re cheap or thin. But you won’t get through high-quality ones easily—they’re made with hardened steel to resist cutting and keep your bike safe longer.
Are Combination Locks Safer Than Key Locks?
No, combination locks aren’t safer than key locks—you can’t pick a key, but thieves can guess or decode combo sequences. Key locks are faster, more secure, and harder to bypass.
You’re better off trusting a solid key mechanism.
How Do I Reset a Combination on My Bike Lock?
You turn dials to your combo, pull the shackle open, then set new numbers while holding it up—lock it down to save them. Remember: measure twice, cut once.
Double-check every digit, or you’ll lock yourself out fast.
Can I Use a Bike Chain Lock in the Rain?
You can use your bike chain lock in the rain without worry—just make sure you’re securing it properly. Rain won’t ruin it, but consistently wet conditions mean you should dry and lubricate it occasionally to prevent rust and keep it working smoothly.
What’s the Lightest Heavy-Duty Bike Chain Lock Available?
The lightest heavy-duty bike chain lock you’ll find weighs around 2.2 pounds—tough, compact, and easy to carry. You’ll lock it fast, trust its strength, and never worry about thieves cutting through.
It’s built to protect without the bulk.
Conclusion
You’ve seen the toughest locks out there, and now you’re ready to lock it down. With these 12 heavy-duty chain locks, you’re not just securing your bike—you’re slamming the door in thieves’ faces.
Whether you go for combo convenience or keyed fortress strength, remember: when it comes to bike security, an ounce of prevention is worth a pound of cure. Ride on, and lock up like a pro.
