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SIGTUNA Bike Locks Heavy-Duty U Lock Review

Kenn Muguna Profile image

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Updated June 27, 2022
92 Expert Rating

Nowadays, all it takes for most thieves to steal a bike from a bike rail is a good pair of bolt cutters, but not if you have the Sigtuna heavy duty bike lock. The 16 mm hardened steel bicycle lock is a weather-resistant alternative that comes with an anti-picking locking mechanism that’s sure to deter even the most experienced thieves from stealing your bike. It also comes with a cable lock that allows you to secure the front wheel as well, giving you complete anti theft protection. If you don’t want to bother with storage, you can always leave the Sigtuna bike lock attached to your bike frame, and ride along knowing that it won’t be moved out of place thanks to a sturdy mounting bracket. Get to the end of this review to find out what else the heavy duty U lock can do for you, as well as why it secures a top three spot on our best bike lock list

Why We Like It – Sigtuna Bike Locks Heavy-Duty U Lock Review

The Sigtuna U Lock has gained a solid reputation for itself as one of the most reliable bike locks you can get in the market today. It’s easily the best bike lock for its price, and with a 100% money back guarantee, you’re free to return it if it doesn’t measure up to your expectations. Another very secure bike lock at a very cheap price is the Onguard Brute Std 8001 model.

  • 100% money-back guarantee
  • 3 Year Warranty
  • Comes with a Mounting Bracket
  • Keys can’t be duplicated


Manufactured in the United States, the Sigtuna bike lock boasts of high performance steel that’s capable of resisting any pulling, jacking or prying from anybody that might consider stealing it. Similar to the Faghettaboudit mini and the Via Velo Bike U Lock, the lock comes with three keys as well as a double bolt design meaning it would have to be cut through on both-ends to set the bike free. This would be very difficult to do considering the 16 mm thick steel shackle. It’s bike lock cable is about 47-inches long, and allows you to firmly secure your bike helmet as well. For a foldable bike, we recommend the Sigtuna Foldable Hardened-Steel Bike Lock which can securely lock around your bike’s frame.


In terms of design, the U Lock shackle of this bike lock comes in a single color combination of silver and black, with the lock cable only available in a black color as well. The rubberized coating on the Sigtuna heavy duty U Lock that’s found around the keyhole helps make it weather-proof and prevents rust, meaning the bike U lock still remains effective even when frequently used under rainy weather, while the flex cable also remains unaffected thanks to its plastic PVC cover. The heavy duty U lock doesn’t come as a steel chain (see the Sportneer 5-Digit Combination Chain Cable Bike Lock), but rather as a U Lock that includes a steel woven cable bike lock that makes it ideal even for a foldable bicycle.


Compared to other high security U Locks such as the New York Faghettaboudit, the Sigtuna U Lock scores a lot more points with potential customers thanks to its 100% money back guarantee. Even though it doesn’t match the Kryptonite New York Standard Heavy Duty Bicycle U Lock’s $4000 reimbursement offer, this tends to inspire confidence in the fact that the Sigtuna bike U Lock is a capable lock bike that guarantees all round theft protection, and not just another cheap steel u lock that’ll break down after a few weeks of use.

Sigtuna Bike Locks Heavy-Duty U Lock Review Wrap Up

Anyone in the market for the best bike lock should definitely consider the Sigtuna U Lock. It is affordable, looks good, and comes with an included cable bike lock that you can use to secure any other bike accessories as well.

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