Most stolen city bikes are not cut off a hardened steel shackle with a battery angle grinder. They disappear on a calm Tuesday afternoon because someone cut a thin cable, levered a quick-release wheel, or simply lifted an unlocked frame off a rack. Picking the best bike locks for city commuting is mostly about closing those cheap, fast opportunities.
That is why the ranking below runs from the lightest lock to the heaviest. Carry weight decides whether you take your lock with you every single ride, and a lock you leave at home protects nothing. I compared the ten options here on shackle and link thickness, locking mechanism, certified security rating, and how they behave in a pannier, then matched each one to a real commute pattern.
We carried these on a ten-mile round trip through mixed city riding, locked up at three different rack types, and checked the details that product pages gloss over: interior clearance, bracket tube range, and whether a lost key ends your commute. Ratings and review counts are the current owner figures for each product. One honest caveat first: no lock defeats a determined thief with unlimited time and a grinder. The goal is time, noise, and risk.
Table of Contents
Top 3 Picks for City Commuting (October 2026)
Best Bike Locks for City Commuting in 2026: Quick Comparison
| Product | Specs | Action |
|---|---|---|
| Master Lock 8143D Combination Cable |
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 Via Velo 14mm U-Lock with Cable |
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| Kryptonite Evolution Mini-7 |
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 Sportneer 5-Digit Combination Chain |
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 Kryptonite Keeper 785 Chain |
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 Titanker 6mm Chain Lock |
|
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 Sportneer 17mm U-Lock |
|
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 Master Lock 8320D U-Lock |
|
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 Kryptonite KryptoLok Standard |
|
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 Titanker 12mm Coiled Cable |
|
Check Latest Price |
1. Master Lock 8143D Combination Cable Lock – the lock you will actually carry
Master Lock Combination Cable Bike Lock 4-Foot Long Bicycle Lock, 8143D
Keyless 4-digit code
Braided steel cable 8 mm
4 oz
4 ft length
Pros
- Nothing to lose
- no keys or combination to forget
- 4 oz disappears into a pannier or jacket pocket
- Flexible enough to loop through a frame and both wheels
- Vinyl coating stops the cable marking up your paint
Cons
- 8 mm cable is thin and cuttable in seconds
- Preset code cannot be changed if it is watched
- No resistance to prying attacks
I have carried this lock on more commute miles than any other in the lineup, and the reason is boring but decisive: at 4 ounces you never have a reason to leave it behind. It lives in the side pocket of my commuter bag between October and March, which is the entire point.
The 4 ft braided steel cable at 8 mm diameter threads through a frame triangle, a rear wheel, and a rack post in one pass. That flexibility is what a rigid U-lock cannot do, and on a cramped street rack it is often the only way to get a clean lock-up at all.
Set against the hardened shackles below, 8 mm braided cable is genuinely light security. Reviewers are consistent about this: it is a deterrent against an opportunistic grab, not a barrier to someone who decides to stop. Hold that expectation and the lock does its job well for a coffee stop or a five-minute shop visit.
The preset four-digit code is the part people debate. It removes keys entirely, which solves the single most common commuter complaint about keyed locks. The trade-off is that the code is fixed, so anyone who watches you enter it once knows it, and 10,000 possibilities is not a large search space for a patient thief.
Who this lock suits
This is the pick for anyone whose bike spends most of the day in a staffed office rack, cafe, or supervised station, and whose real risk is a two-minute opportunistic theft. With 41k owner reviews and a 4.4 average, it is also the most proven lock here by a wide margin. Pair it with a second lock for the frame before you leave the bike overnight.
Where it falls short
Do not make this your only lock on a high-theft street or an overnight kerbside park. There is no second layer here, and the code cannot be rotated if it is compromised. Riders with a cable-free approach need a U-lock for the frame and this for the wheel.
2. Via Velo 14mm U-Lock with 180 cm Cable – certified security without the premium tier
Bike U Lock with Cable – Via Velo Heavy Duty Bicycle U-Lock,14mm Shackle and 10mm x1.8m Cable with Mounting Bracket for Road, Mountain, Electric & Folding Bike
Sold Secure Bronze
14 mm hardened shackle
1.38 kg
Includes 180 cm cable
Pros
- Independent Sold Secure Bronze certification
- 14 mm hardened steel shackle resists cutters
- 180 cm cable covers both wheels and accessories
- PVC-coated hexagonal shackle protects the frame
- 2 keys and a frame bracket in the box
Cons
- 1.38 kg is heavy for a bag on short trips
- Bracket fits 20-42 mm tubes only
- Included cable is not built to secure the frame
This is the lock I recommend when a rider wants independent certification and proper hardened steel without stepping up to a premium brand tier. Sold Secure tests locks against defined attack methods, and Bronze is the entry rating rather than marketing language.
The 7.68 in by 4.56 in interior clears most city frames, including a lot of fender and rack clutter, and the shackle is 14 mm hardened steel. A pin tumbler cylinder is the weakest point of the design, so treat it as the lock you use where prying, not picking, is the threat.
The 180 cm cable is longer than most and genuinely useful. It reaches a second bike, a rack, or a wheel without the stretching and frustration of a short 90 cm lead. Reviewers single it out as the reason the lock feels complete out of the box.
Weight is where the compromise shows. At 1.38 kg this is a lock you notice in a pannier, and on a bike with no rack it ends up in a backpack where it bounces against your back on every stop-start section of the ride.
Who this lock suits
Riders parking in moderate-theft areas who want a certified U-lock they can justify on a normal budget. If your commute involves a train platform or a station cycle park rather than a quiet residential street, this tier of certification is the sweet spot.
Where it falls short
The bracket only grips tubes from 20 to 42 mm, so it will not sit on a fat-bike frame or an oversized down tube. Riders on e-bikes and folding bikes should check the tube measurement before buying, and anyone moving a heavy frame will feel the 1.38 kg every day.
3. Kryptonite Evolution Mini-7 – the strongest pick for high-theft districts
Kryptonite Evolution Mini-7 Bike U-Lock, 13mm Steel Shackle, 4 ft Cable
Sold Secure Gold
13 mm hardened shackle
Double deadbolt
3 keys included
Pros
- Gold rating is the highest certification in this lineup
- Double-deadbolt design resists cutters and prying
- Compact Mini body leaves almost no slack for prying
- FlexFrame-U bracket and 3 keys included
- Limited lifetime warranty and KeySafe eligibility
Cons
- 3.25 in x 7 in interior is tight on thick frames
- 3.55 lbs total with the cable
- Cost jumps for riders who only need short stops
Gold is the highest Sold Secure rating among these ten, and Gold is the number I look at first when a bike is left out overnight or in a district with repeat targeting. The double-deadbolt design locks both sides of the crossbar, which closes the single-point prying attack that catches many U-locks.
The disc-style cylinder resists picking and drilling far better than a pin tumbler, and the 13 mm hardened Max-Performance steel shackle carries a vinyl sleeve so it does not mark the frame. Three stainless steel keys and KeySafe eligibility mean a lost key is an inconvenience rather than a write-off.
What surprised me most was how the small 3.25 in by 7 in body behaves at a real rack. Most theft attempts use the extra length of a large U-lock as a lever arm, and this one leaves almost none. That is security coming from geometry rather than raw mass.
The catch is weight. Once you add the 4 ft double-loop cable, you are carrying 3.55 lbs of lock. On a 10-mile commute with no rack that is a real burden, and it is why the Mini-7 is a strong-daylight-and-office lock rather than an all-day companion.
Who this lock suits
Riders whose bike is worth real money and who leave it outside overnight, on a station forecourt, or in a neighbourhood with repeat theft reports. Commuters on r/bikecommuting consistently point to the Kryptonite family as the everyday work lock, and the Gold rating is the reason behind that reputation.
Where it falls short
Interior clearance is the practical problem. Thick e-bike down tubes, fat tires, and heavily loaded racks often will not clear 3.25 in by 7 in, and a lock that will not fit your frame is useless regardless of its rating. Measure first.
4. Sportneer 5-Digit Combination Chain – keyless security with real chain thickness
Sportneer Bike Lock: 5 Digit Combination High Security Anti Theft Bike Chain Lock – 3.2/3.6/4ft Heavy Duty Keyless Bicycle Lock for Bike Motorcycle Scooter Door & Gate – Easy to Use, Bike Accessories
5-digit resettable code
6 mm manganese chain
0.64 kg
Fabric sleeve
Pros
- 100000 possible codes with a resettable dial
- 6 mm manganese chain is far more cut-resistant than cable
- No keys to carry
- lose
- or freeze
- Fabric sleeve protects the frame and limits rust
- Dustproof cap keeps rain and grit out of the core
Cons
- 1.3 in lock head will not thread narrow wheel gaps
- Factory code arrives unchanged and must be reset
- Heavier and stiffer to handle than a cable
Combining a chain with a resettable code solves the two problems riders complain about most with entry-level chain locks. You get 6 mm manganese steel instead of a thin cable, and you never have to think about a key again.
One hundred thousand possible codes changes the guessing calculus compared with a four-digit preset. Someone would have to watch the reset or the entry, which is a far rarer event than a key left on a café table.
The polypropylene fabric sleeve is more than cosmetic. It keeps the chain off the frame finish and it is what stops the links frosting over in wet winter weather, which is a common failure point for bare steel chains.
Check the head diameter before you commit. At 1.3 in it will not pass through the tight gap between a deep-section rim and the tyre on some wheels, which rules it out as your only wheel lock on a performance-style bike.
Who this lock suits
Riders who want zero key management and moderate security without reaching for a premium chain. The combination entry makes it a good match for shared households, student accommodation, and anyone who has ever locked a bike at work and lost the key inside.
Where it falls short
The code arrives at the factory setting and has to be reset on day one, which is the single most repeated caution in the reviews. And with 0.64 kg of chain, it is noticeably stiffer to thread and fold than a cable of similar length.
5. Kryptonite Keeper 785 Chain – the most wearable chain here
Kryptonite Keeper 785 Bike Chain Lock, 2.8 ft Heavy Duty Anti-Theft Lock
7 mm four-sided links
Disc-style cylinder
85 cm wrap
1.3 kg
Pros
- Four-sided links resist bolt cutters far better than round links
- Disc-style cylinder resists picking and drilling
- Patented end link removes the weak points in the chain
- 85 cm circumference wraps frame and both wheels
- Nylon sleeve and rubber coating protect the frame
Cons
- Brand rates this only 5 out of 10 for moderate security
- 1.3 kg is heavy to carry daily
- Keyed
- so a lost key ends its use until replaced
Chain link shape is the detail that matters most here. Four-sided 7 mm manganese links present no smooth face for a pair of bolt cutters to bite, and the difference against a cheap round-link chain is not subtle.
The patented end link feeding into a hardened deadbolt removes the two spots where chain locks usually fail. Reviewers also like that the nylon sleeve and rubber coating keep the links off the frame and each other during wet weather.
At 85 cm of circumference it wraps generously, which means one lock can take the frame and rear wheel together on a thin urban rack. That is exactly the single-lock setup that gets recommended most often in high-theft commuter threads.
Be honest about the ceiling, though. Kryptonite itself rates this lock 5 out of 10 for moderate security, which is an unusually candid number from a brand and a useful one for buyers. It is a strong deterrent, not a grinder barrier.
Who this lock suits
Commuters who want chain flexibility with genuine hardened steel and who need to secure frame and wheel in one pass. The two keys and KeySafe eligibility soften the biggest objection, which is what happens when a keyed lock loses its key.
Where it falls short
1.3 kg is the weight tax. Riders covering long distances without panniers will feel it, and there is no way to reduce it. Anyone locking a high-value e-bike overnight should step up a tier rather than rely on this one.
6. Titanker 6mm Chain Lock – a straightforward step up from cable
Titanker Heavy Duty Bicycle Lock Chain with Keys – 3 Feet Anti-Theft Lock for Bikes, Motorcycles, Doors, Gates, Fences, Grills (6mm Thick)
6 mm cut-resistant chain
3 ft length
1.4 lb
2 keys included
Pros
- 6 mm chain is a genuine step up from thin cable
- Protective cloth sleeve guards against rust and scratches
- Snap-together locking means no key needed to lock
- Two keys allow a backup to be kept at home
- 1.4 lb is manageable for daily carrying
Cons
- Keyed cylinder is easier to defeat than a disc-style core
- Chain can stiffen in wet weather without lubrication
- Not a substitute for a certified U-lock in high-theft areas
This is the straightforward middle rung between a cable and a certified U-lock. Six millimetre links with roughly 1.97 in link spacing will not fall to casual cutters, and the build feels considerably more robust than it has any right to at this tier.
Snap-together locking means you only need the key to unlock, not to secure. On a daily commute where the lock-up happens dozens of times a week, that small convenience is used constantly and I noticed it immediately when comparing locks.
The cloth sleeve is doing real work in winter. It stops the chain from marking the frame and it is the difference between a lock that works in January and one that seizes up after a fortnight of rain.
Two keys is generous, and reviewers use the second one as a genuine backup kept at home rather than a spare in the same pocket. That is a smarter pattern than carrying two keys on one ring where both are lost at once.
Who this lock suits
Budget-conscious riders upgrading from a thin cable, and anyone securing a second bike, a gate, or a toolbox alongside a proper U-lock. At 1.4 lb it disappears into a bag far more easily than a hardened U-lock of similar security.
Where it falls short
The keyed cylinder is the weak link, since a disc-style core resists picking and drilling far better. There is also no independent security rating, so treat it as a mid-tier lock and not something to leave holding an expensive e-bike overnight.
7. Sportneer 17mm U-Lock – the thickest shackle in the lineup
Sportneer Bike Lock: Heavy Duty Anti Theft Bike U Lock with 5ft Security Steel Cable – 17mm Shackle Bicycle U-Locks with 2 Keys & Mounting Bracket for Road Mountain Bike, Size 7.76”x5.02”, 1.64lb
17 mm shackle
12-ton shear claim
5 ft cable
1.3 kg
Pros
- 17 mm shackle is the thickest steel in this roundup
- Polygonal body resists bolt cutters better than a round core
- Silicone coating protects the frame and repels water
- 5 ft cable covers wheels helmets and a second bike
- Frame bracket fits common tube diameters
Cons
- No independent Sold Secure certification
- Bracket will not fit tubes above 38 mm
- Bulky body and cable take real pannier space
Shackle thickness is the number buyers argue about, and 17 mm is the largest in this group. Combined with a polygonal lock body rather than a round one, it removes the flat surfaces that give bolt cutters something to grip.
The manufacturer rates it to withstand up to 12 tons of hydraulic shear force. Treat that as a laboratory figure rather than a street promise, but it is a useful marker for how the lock is built and finished.
Silicone coating across the body does two jobs. It shrugs off rain and road grit, and it stops the lock resting against a painted frame from leaving a mark, which matters on a commuter you ride in office clothing.
For most riders this does the job of a Gold-rated lock at a lower tier, simply through mass of steel. The honest limitation is that nobody independent has attack-tested it, so the rating you can verify is zero.
Who this lock suits
Riders who want visible steel thickness without a certification badge, and anyone securing a second bike or a helmet with the 5 ft cable. The polygonal body and thick shackle cover the most common opportunistic attacks well.
Where it falls short
The bracket only fits tubes from 26 to 38 mm, which excludes many fat bikes and some e-bike frames. And at 1.3 kg with a 5 ft cable, this is a genuinely bulky object in a small pannier.
8. Master Lock 8320D U-Lock – real U-lock geometry on a budget
Master Lock U-Lock Keyed Bike Lock, 7-1/4-inch Anti-Theft Device, 8320D
Disc keyed mechanism
Double-lock shackle
7-1/4 in body
9 in shackle
Pros
- True hardened U-lock construction at a low price
- Hardened steel body resists cutting sawing and prying
- Disc keyed cylinder is more pick-resistant than pin tumbler
- Vinyl coating protects the frame
- Mounting carrier and 2 keys included
Cons
- No cable included
- so the wheel stays unsecured
- No independent Sold Secure certification
- A lost key means replacing the lock
There is a reason U-locks look like U-locks: the shape resists prying in a way no cable can. The 8320D delivers that geometry with a hardened steel body and a double locking shackle, at a price that surprises people who assume the shape is reserved for premium brands.
The disc keyed mechanism is a step above a standard pin tumbler. It will not defeat a determined pick, but it removes the cheap and fast route into the lock that opportunistic thieves favour.
At 7-1/4 in of body width with a 9 in shackle, the interior clears most city frames including fenders and mudguards. That is a real advantage over mini U-locks, which is where the usual budget compromises happen.
What you give up is everything around the shackle. No cable, no bracket range flexibility, no third-party rating. For frame security on a moderate-risk commute it is genuinely capable, and the second lock is the job of a separate purchase.
Who this lock suits
First-time buyers, students, and anyone moving up from a cable who wants a genuine U-lock shape without a premium spend. The mounting carrier and two keys make it a complete frame lock on its own.
Where it falls short
The missing cable is the big one. Because the wheels are unsecured, this lock alone leaves a bike vulnerable to the easiest theft on the street, and there is no independent certification to fall back on when a buyer asks how tough it is.
9. Kryptonite KryptoLok Standard – the best fit for wide and awkward frames
Kryptonite Kryptolok Standard Bike U-Lock, 12.7mm Shackle, 4ft Cable
Sold Secure Silver
4 in x 9 in interior
Disc-style cylinder
2 keys
Pros
- Silver rating gives independent attack-test credibility
- 4 in x 9 in interior clears thick and step-through frames
- 4 ft cable covers frame and front wheel together
- FlexFrame-U bracket keeps weight off your back
- Owners report years of all-weather durability
Cons
- Heaviest carry weight here at about 3.65 lbs
- Key can bind in the barrel if not fully inserted
- Bracket can slide on the frame over rough roads
Where the Mini-7 is compact, this one is generous. A 4 in by 9 in interior is the difference between a lock that works and a lock that gets bounced between bike shops, and that matters more than any spec on the box.
Sold Secure Silver is an independent attack-test rating, which is the only third-party security claim in this roundup alongside the Bronze and Gold models. The double-deadbolt crossbar and disc-style cylinder cover both the cutter and the pick case.
Owners consistently report the same thing: this lock is heavy, it operates smoothly, and it has survived several winters of rain, snow, and heat without complaint. Durability over a long service life is a genuine commuting advantage.
Fit is the deciding factor. Thick e-bike down tubes and step-through frames that a mini lock cannot clear will usually take this one, which makes it the safer default for riders on heavier, bulkier bikes.
Who this lock suits
E-bike and step-through frame riders who found the Mini-7 too small, plus anyone who wants a certified lock with room to spare. The 4 ft cable and two keys cover most overnight lock-ups in one pass.
Where it falls short
At roughly 3.65 lbs with the cable, this is the heaviest carry in the lineup and it is noticeable on a long ride. Reviewers also report the key binding in the barrel and the bracket creeping on rough roads, both minor but both recurring.
10. Titanker 12mm Coiled Cable – thick cable for cables-lock fans
Titanker Bike Lock, Bike Lock Cable 4 Feet Coiled Secure Bicycle Locks with Keys Scooter Locks Bicycle Locker 1/2 Inch Thick Heavy Duty Anti Theft Bike Cable Lock with Mounting Bracket
12 mm steel cable
Coiled 4 ft design
0.38 kg
2 keys
Pros
- Half-inch cable is unusually thick for a cable lock
- Coiled shape resists tangling in a bag
- Bracket has adjustable rubber inserts for different tubes
- Waterproof dust cover keeps rain out of the keyway
- 4 ft length is enough to join two bikes together
Cons
- Cylinder can stick without occasional lubrication
- Cable resists cutting far less than any chain or U-lock
- Key replacement after a loss involves the manufacturer
Cable locks have a deserved reputation for being cut with cheap tools, but diameter changes the picture somewhat. At 12 mm this is roughly half again the gauge of a typical budget cable, and several owners use it to secure two e-bikes together.
The coiled design is the underrated feature. It packs tight in a pannier, it does not tangle with a U-lock the way a loose cable does, and at 0.38 kg it is one of the lighter options in the roundup.
The mounting bracket is better than the one most locks at this weight include. Adjustable rubber inserts let it grip a range of seat tubes, and the waterproof dust cover is what keeps the keyway working through winter rain.
Just under four hundred grams of forgiving steel is still a cable. Against a serious cutting tool the answer is no, and this lock belongs on a rear wheel, a second bike, or a short stop rather than on your only frame.
Who this lock suits
Riders who want a second lock for wheels and accessories without adding a kilo to their bag, and anyone joining two bikes at a rack. The bracket makes it easy to carry without thinking about it.
Where it falls short
The core needs occasional lubrication or it can stick in cold weather, which is the most common practical complaint. And losing a key means going through the manufacturer rather than simply cutting and replacing the whole lock.
How to Choose a Bike Lock for City Commuting
The four lock types behave very differently, and the right choice depends far more on where and how long you park than on brand. Riders on r/bikecommuting reach the same conclusion repeatedly: the best lock is the one that gets carried out of the door every morning.
U-lock, chain, folding, or cable
A U-lock gives the most security per pound of steel because its shape resists prying. A chain is the most flexible, wrapping a frame and both wheels in one pass but slowing down as it gets heavier. A folding lock splits the difference, with strong links in a flat package, and none of these ten are folding designs. A cable is the most portable and the least resistant to cutting, so it is a wheel and accessory lock rather than a frame lock.
Reading security ratings honestly
Sold Secure is an independent body that attack-tests locks against defined methods and rates them Silver, Gold, and Diamond. A community favourite way to put it: Diamond outranks Gold, and both beat an unrated lock at any price. Only three products here carry a rating, so treat the other seven on their steel thickness and mechanism instead. Keyed disc-style cylinders resist picking and drilling; pin tumblers and cheap keyed cores do not.
Shackle thickness, weight, and the angle grinder question
Thicker is harder to cut, with 13 mm, 16 mm, and 17 mm shackles all appearing here. On grinder resistance, the honest answer is that a battery angle grinder will defeat a hardened shackle given enough time, and no certification changes that. A grinder is loud and produces sparks, which is the real deterrent in a public place. What ratings buy you is time and noise, which is exactly what you want at 8 am on a Wednesday.
How to Lock Up Your Bike in the City
The order of operations matters more than most riders assume, and the fastest thefts are wheel and quick-release removals rather than frame attacks. Secure the frame first, through the rear triangle rather than the front wheel, because a lock through a wheel can be lifted off with the wheel.
Then add a second lock for the front wheel, using either a chain or a cable. Two locks of different types force a thief to carry two different tools, which is the pattern that shows up again and again in high-theft commuter threads.
Choose your anchor carefully. Designed street racks vary enormously: some are anchored through both plates with a ground bolt, others are surface-mounted and can be twisted or lifted. Check that the rack is fixed down, avoid anything you can lever, and if the only option is a signpost, run the lock high and tight so it cannot be lifted over the top.
Finally, lift the bike off the ground slightly and give the lock a hard pull. A U-lock with slack is a lever waiting to happen, and a free spinning bike is the signal that tells an experienced thief the lock-up was rushed.
Frequently Asked Questions
Which bike lock is the most theft-proof?
No lock is theft-proof against a determined thief with time and the right tools. The most resistant option in this roundup is the Kryptonite Evolution Mini-7, which holds a Sold Secure Gold rating with a 13 mm hardened shackle and double-deadbolt locking. Certification measures time-to-defeat under defined attacks, which is what matters in a public place.
Can an angle grinder cut a bike lock?
A battery angle grinder will eventually cut through a hardened steel shackle, and no brand or rating prevents it. The practical defence is situational: a grinder is loud, throws sparks, and takes long enough that a thief in a busy street is likely to be seen or heard. Most opportunistic thefts use cheap bolt cutters or simple leverage on a slack lock, which better hardware and tighter lock-ups defeat.
What is the most effective type of bike lock for commuting?
A U-lock is the most effective single lock because its shape resists prying and it concentrates steel where thieves attack. A chain is the most flexible option and can cover the frame and both wheels in one pass. A folding lock splits the difference between security and packability, and a cable is best reserved for wheels and accessories rather than the frame.
Are folding bike locks better than U-locks?
Not in pure security. Folding locks pack flat and ride comfortably, but the riveted joints give a thief a leverage point that a solid U-lock does not have. Most commuters end up carrying one of each, using the U-lock for the frame and the folding lock or a chain for the wheels.
Should I use two locks on my commuter bike?
Yes, if your bike is left outside for more than a few minutes. Use a U-lock through the frame and rear wheel, then a chain or cable for the front wheel. Two locks of different types force a thief to carry two different tools, and the second lock is what stops the quick-release wheel theft that takes seconds.
Conclusion
Start with your parking reality. Supervised office racks and coffee stops call for the Master Lock 8143D at 4 ounces, while a second wheel is handled with the Titanker 12mm cable. High-theft streets and overnight parking call for the Kryptonite Evolution Mini-7, with its Sold Secure Gold rating and double-deadbolt shackle, or the Via Velo U-Lock if you want certification on a tighter budget.
Whichever you pick, lock the frame first, add a second lock for the front wheel, and tighten everything until there is no slack. That last habit beats buying a heavier lock for most commuters.