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Bike U Lock - Sigtuna Bike Lock Heavy Duty Anti-Theft with 4ft/1.2m Cable, Bicycle U Lock with Sturdy Mounting Bracket for Mountain Bikes, Ebikes, Scooters

4.5 4.5 out of 5 stars 7,113 ratings

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Brand SIGTUNA
Special Feature Anti-theft,Heavy Duty
Lock Type Key Lock
Item Dimensions LxWxH 9.45 x 6.97 x 1.89 inches
Material Steel

About this item

  • PROTECT YOUR RIDE ✔️ This awarded SIGTUNA anti-theft Bike U-lock is made of 16MM High-Performance Steel for Extensive Holding Power and Resistance against Cut and Leverage attacks with a wapping 85/100 Security Rating. Get the best security available and protect your ride with Sigtuna Locks!
  • CHOOSE POWER ✔️ This Bike Lock Combination has a High-Security Disc-Style Cylinder and Double Deadbolt locking mechanism, very effective and certified against Leverage Attacks. With SIGTUNA you make the right choice and give thieves no chance! Great bike accessories!
  • EASY-TO-USE ✅: This model SIGTUNA Bike Lock Combination comes with a Easy-to-Install Bike Lock Mount, a Protective Coating to protect your bikes paint and not 2, but 3 Laser-Cut Abloy Keys. With this lock you get Security AND Convenience!
  • 100% MONEY-BACK GUARANTEE ✅: If this U-lock is not the favorite you ever owned - some say it is heavy, but that means quality - just send it back and get a 100% refund. SIGTUNA stands for its products. Our customers love that, we know you will too!
  • ORDER YOURS NOW ‎✅: Click "Add to Cart" NOW to get your 16mm SIGTUNA Bike U lock with 1200mm Flex Cable + Mount Bracket tomorrow and give your Bike the Love it deserves.

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Product Description

Model Wodan U-Lock and flex cable combo
bike security doesn't get tougher than sigtuna, double-bolt locking mechanism, extra shackle
How to properly lock up your bike

How to install our U-lock!

step 1

step 2

step 3

step 4

Step 1: Choose the mounting location:

Decide where on your bike you want to mount the U-lock bracket. Typically, the most common locations are the seat post, the top tube, or the down tube. Choose a spot that is easily accessible but also doesn't interfere with your riding.

Step 2: Attach the bracket to the bike:

Once you have decided on the location, use the provided screws and a screwdriver to attach the bracket to the bike frame. Make sure the bracket is securely attached and tightened so it doesn't move or slide around while you're riding.

Step 3: Test the fit

Before you put your U-lock into the bracket, test the fit to ensure it will hold your lock securely. Insert the U-lock into the bracket and check to see if it fits snugly. If the fit is too loose or too tight, adjust the bracket as necessary.

Step 4: Secure the U-lock in the bracket

Once you have ensured a good fit, place the U-lock into the bracket and make sure it is secure. You may want to give it a little shake or tug to ensure it won't fall out while you're riding. Congratulations, your U-lock bracket is now installed!

Heavy duty U Lock with U Lock shackle in black and a mount holder plus a steel chain cable Heavy duty U Lock with U Lock shackle in black and a mount holder plus a steel chain cable Heavy duty U Lock in black with U Lock shackle in grey plus a steel chain cable Hardened Steel Heavy Duty Bike Lock, easily folded, portable, space saving, and anti-scratch 1 2
Orange Bike U Lock Yellow Bike U Lock Grey Bike U Lock Yellow Folding Lock Black Folding Lock Black Long U Lock
Customer Reviews
4.5 out of 5 stars
1,120
4.5 out of 5 stars
7,113
4.6 out of 5 stars
1,249
4.3 out of 5 stars
1,136
4.3 out of 5 stars
1,136
4.5 out of 5 stars
1,120
Model Name Wodan Wodan Thor Vidar Vidar Wodan
Outer Size of Lock 9.4*5.8 inch 9.4*5.8 inch 8.3*6.9 inch 7.5*2.25*1.5 inch (Folded) 7.5*2.25*1.5 inch (Folded) 13.4*7.7 inch
Diameter of Shackle 0.63 inch 0.63 inch 0.63 inch (Square Shackle) 0.315 inch (Thick) 0.315 inch (Thick) 0.63 inch
Length of Flex Cable 47.2 inch 47.2 inch 70.9 inch / / 47.2 inch
Diameter of Flex Cable 0.47 inch 0.47 inch 0.47 inch / / 0.47 inch
Lock Weigiht 3.5 lbs / 1.6 kg 3.5 lbs / 1.6 kg 3.64 lbs / 1.65 kg 1.76 lbs / 0.80 kg 1.76 lbs / 0.80 kg 4.82 lbs / 2.19 kg
Easy-to-Mount Mounting Bracket
3 Laser-Cut Abloy Keys
Anti-Scratch Protective Coating
Other Special Features High-Security Disc-Style Cylinder. Double Deadbolt Locking Mechanism High-Security Disc-Style Cylinder. Double Deadbolt Locking Mechanism Smooth Keyhole Cover, Double Deadbolt Locking Mechanism Special ABS Shipbuilding Steel, Soft-Touch Coating, Silicone Lock Body Cover Special ABS Shipbuilding Steel, Soft-Touch Coating, Silicone Lock Body Cover High-Security Disc-Style Cylinder. Double Deadbolt Locking Mechanism

Product information

Technical Details

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Bike U Lock - Sigtuna Bike Lock Heavy Duty Anti-Theft with 4ft/1.2m Cable, Bicycle U Lock with Sturdy Mounting Bracket for Mountain Bikes, Ebikes, Scooters


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Customer reviews

4.5 out of 5 stars
4.5 out of 5
7,113 global ratings

Customers say

Customers like the ease of assembly of the lock. For example, they mention it's easy to attach to their bike and the cable is supple and easy to work with. That said, they're happy with performance, cable, and value. That being said, opinions are mixed on portability, mountability, and size.

AI-generated from the text of customer reviews

1,682 customers mention1,252 positive430 negative

Customers like the quality of the lock. They say it's very solidly built, and feels like a quality product. The cable seems made well enough, but it provides little protection. Overall, customers find it great for securing their bike at a fraction of the cost of similar locks.

"...Another annoying thing is getting the key to unlock. The key hole and key are fine but some reason it takes a little fiddling each time I want to..." Read more

"Works great good quality, very strong" Read more

"...Built-in protector for wear and tear of keyhole against weather elements- Unbeatable price point for the whole package-..." Read more

"...of use and sitting in sun, rain, heavy snow, the lock is still functioning perfectly too." Read more

442 customers mention392 positive50 negative

Customers like the ease of assembly of the lock. They say the system was intuitive, easy to attach to their bike, and the lock was fairly easy to install. The cable is supple and easy to work and thread through the bike. The carrying system is flexible and can be installed on various frame sizes. The lock is easy to use and to mount to the bike frame. It is convenient to mount on the bike, but keep in mind that it does add some weight.

"...And I suspect its much better security. The key has been easy to turn - something that was a problem with the other Master U lock I had that this..." Read more

"...The lock is easy to use and to mount to my bike frame. Although it is a bit heavy it is very easy to carry in my pack or mounted to the frame...." Read more

"...The mounting system was intuitive and easy to install. I was glad it was included in the package instead of an add-on...." Read more

"The biggest plus is the attachable bike adapter vs putting the u bolt to the bike and it rattling around...." Read more

347 customers mention310 positive37 negative

Customers like the value of the lock. They say it's a great lock for a good price, and worth the little bit of extra weight.

"...Unbeatable price point for the whole package- Lock bracket provided- Doesn't weigh a lot (compared to other U-locks)-..." Read more

"...The versatility and features plus low price makes it a great buy Very happy so far" Read more

"...I would definitely recommend this lock and cable, such a great price for great quality!Cons:..." Read more

"...Great price and works just as good as Kryptonite at a much reduced price. It comes with two keys both of which work fine in the lock itself...." Read more

254 customers mention249 positive5 negative

Customers are satisfied with the performance of the lock. They mention that it serves its purpose, is of good quality, and works smoothly. Some say that the lock holder works well with the lock and that it does everything they need it to.

"Works great good quality, very strong" Read more

"...Great price and works just as good as Kryptonite at a much reduced price. It comes with two keys both of which work fine in the lock itself...." Read more

"Works fine. I have odd shaped tubes too. I would have taken more time and measured spaces on my bike" Read more

"...time in the location where I lock my bicycle the “U-Lock” portion of the system is perfect and will no doubt perform as intended...." Read more

163 customers mention114 positive49 negative

Customers are mixed about the mountability of the lock. Some mention that the ability to mount it is nice, with a good mounting system. However, others say that the mounting system cannot be mounted on the horizontal bar of their bike, it does not keep the lock firmly in place, and the mounting bracket does not fit anywhere on their bike.

"...The lock is easy to use and to mount to my bike frame. Although it is a bit heavy it is very easy to carry in my pack or mounted to the frame...." Read more

"...And the strong steady mount makes it so I don't need to carry a bag with me just to ensure I can hold my lock..." Read more

"...The mounting system cannot be mounted on the horizontal bar of my bike, as it had a cable on the bottom for the read breaks.-..." Read more

"...point A to B. This aspect, though, has been resolved by a simple mounting bracket easily attached to the bike frame...." Read more

119 customers mention112 positive7 negative

Customers appreciate the cable that is included with the lock. They say it's a great length and can secure both the front and rear tires. Customers also like that the lock comes with a convenient security cable and bike mount.

"...Here is a list of pros and cons:Pros:- Flex cable is great in securing both wheels-..." Read more

"...Bottom lineThe U-lock is secure, the cable is good to have, the frame mount is lame. I think they could nail this in version 2." Read more

"...The cable comes with a strap that makes it great for riding I store it on the u bolt the way it was strapped in the box sent to me...." Read more

"...I really liked the fact that these came with the cable so I didn't have to buy one separately...." Read more

254 customers mention151 positive103 negative

Customers are mixed about the portability of the lock. Some mention that it is extremely sturdy and relatively heavy, while others say that it's a tad heavy.

"...Also once attached to my bicycle it's not that heavy.I'll have to update my review once I've used it longer...." Read more

"...Although it is a bit heavy it is very easy to carry in my pack or mounted to the frame...." Read more

"The lock is very strong and secure without being too heavy. Mounting on the bike is very convenient but keep in mind that it does add some weight...." Read more

"...but have fiddled with it a lot and it it seems to be well made. Heavy, but I suppose that is good...." Read more

205 customers mention95 positive110 negative

Customers are mixed about the size of the lock. Some mention that it fits well on their bike, with the holder fitting tight. The cable is an extra plus, and it fits perfectly to wrap around both tires and the frame. However, others say that the size is just slightly too big for them to attach it with the mounting bracket.

"...the longer "U" of the lock since sometimes I have trouble fitting the lock through both the pole, my back tire and the metal bar..." Read more

"...Everything feels extremely sturdy. I appreciate the size of the lock as I had been using my wife's old Kryptonite and found it difficult at times..." Read more

"...The swivel mount on the U-lock does not tighten much, and I feel that over time it will swivel in the way while riding-..." Read more

"...The holder fits tight...the U lock locks in without any worry of falling out as some have described...." Read more

Heavy, clunky.... but solid for sure
4 Stars
Heavy, clunky.... but solid for sure
And then there's the cable to deal with. And what's the keyhole cover? Not sure what it is, no graphic or description other than "keyhole cover". If it's a little round plug for the keyhole entry, I don't think it came in the shipment or I lost the little booger. I paid about 25$ for this on lightning 2 years ago. I understand better now why I haven't used it in two years. Still nib, SB able to easily get my money back or maybe use it to barter for bike parts since the price has inflated in two years. It's a solid lock and cable, but you'll probably need a backpack or saddle bags to haul it around. By the way, the bike is a mid 90's 19" Trek Multi-track 720. The sigtuna weighs 3lbs 4oz, more than 10% of my bikes weight. I'll probably try to utilize it with my ebike that's on order and forego using it on the Trek as I've done for the last two years. I think the sigtuna lists for $40 or $50 now. Imo, it should be marketed as more of an ebike lock to compensate for the weight.
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Top reviews from the United States

Reviewed in the United States on December 2, 2018
90 people found this helpful
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Reviewed in the United States on April 26, 2019
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5.0 out of 5 stars Solid Lock, Worth the money, would recommend
Reviewed in the United States on April 26, 2019
My requirement is to get a lock under $30. After browsing through several options, shortlisted 2 finally.

1. SIGTUNA Bike locks - 16mm U Lock with Steel Chain Cable
2. Kryptonite Kryptolok Series-2 Mini-7 with Steel Chain Cable

Initially I thought I would go with Kryptolok as its sleek to fit it in the bike. But after trying out both, I decided to go with SIGTUNA itself.

- Though SIGTUNA is bulkier than Kryptolok, in terms of both lock head and the shackle, it didn't look that bulkier when you put on the bike. Also heavier it is, more safer it is!
- SIGTUNA is wider than Kryptolok, which helps to lock the wheel with the frame and the pole easily and comfortably.
- SIGTUNA locks on both the side of the shackle (Double Deadbolt locking), while the Kryptolok has a bent foot design on one end. My understanding is, it requires to cut on both the sides to release the lock, while on Kryptolok its enough to cut on one side and the shackle releases automatically on the bent foot side.

However, few small issues / concerns..
- The mounting system is made of plastic. I'm not sure how long it will hold the lock. Also, it is not sturdy and wobbles a lot when you mount the lock.
- The mounting system cannot be mounted on the horizontal bar of my bike, as it had a cable on the bottom for the read breaks.
- The lock is not that smooth. Sometimes it gets stuck and need to retry couple of times.
- The Key Hole Cover is not that great. Feels like cheap plastic.
- May be the lock head could have been less bulkier for the 16mm shackles.

SIGTUNA Vs Kryptolok
- Steel Shackle: 16mm vs 13mm
- Weight: 3.75 lbs vs 2.75 lbs
- Number of Keys: 3 vs 2
- Cable Length: Both are 120 cm (4 ft)

PS: Amazon prize might be different for Kryptolok. Found in REI for $25.

Shortly, I would not complain the lock for the money! Definitely would go for it and recommend the same.
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11 people found this helpful
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Reviewed in the United States on April 11, 2019
5 people found this helpful
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Reviewed in the United States on February 3, 2024

Top reviews from other countries

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Client d'Amazon
5.0 out of 5 stars Parfait !
Reviewed in France on March 20, 2024
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Client d'Amazon
5.0 out of 5 stars Parfait !
Reviewed in France on March 20, 2024
Antivol solide et assez lourd. Le câble est parfait pour accorcher les 2 roues. Le tout est facile à transporter grâce à son support à mettre sur le vélo. Malgré une boîte légèrement endommagée, ce qui est pas très grave le produit reste excellent. Parfait pour assurer la sécurité de votre vélo, je recommande !
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Kabir Baidhya
1.0 out of 5 stars Only for small/light bikes, won't protect big ones. My bike was stolen. U-lock was gone, cable torn
Reviewed in Sweden on September 4, 2023
Customer image
Kabir Baidhya
1.0 out of 5 stars Only for small/light bikes, won't protect big ones. My bike was stolen. U-lock was gone, cable torn
Reviewed in Sweden on September 4, 2023
This lock seemed promising at the first glance. Perhaps, it is good for lighter bikes with a simple frames but it would not protect heavier bikes or bigger frames - at least it didn't protect my bike which has a heavier build. The U-lock was too small for my bike and the cable was too weak.

I had locked my bike in the bike parking station to one of the bike slot. U-lock was gone along with the bike -- I don't know how they managed to cut it, and the tightened cable torn apart and a piece was left.

Buyers please reconsider the type of bike you have before considering a lock.
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Ana
5.0 out of 5 stars Muy solido y pesado
Reviewed in Spain on August 17, 2023
casarottomaurizio
5.0 out of 5 stars Lucchetto immenso
Reviewed in Italy on July 15, 2023
Kentsydney
5.0 out of 5 stars bike lock
Reviewed in Australia on January 21, 2024