Seatylock Pentagon Bike U Lock Review

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Quick Overview

FEATURES

QUALITY

PRICE

Pros

  • Awarded highest security rating possible by Sold Secure
  • Patented pentagonal bars provide extra strength without adding weight
  • Double deadbolt protects against twist attacks and is a strong deterrent
  • Can't be cut, sawed, drilled, or frozen
  • Weighs less than other U locks with the same security level
  • Wide internal clearance allows you to securely attach the lock to many lamp posts, traffic lights, and other objects
  • Coated for rust protection, scratch protection, and UV resistance
  • Versatile universal mounting bracket
  • Quiet, no-rattle design
  • Comes with 3 keys
  • Seatylock will help you replace your keys on a registered lock

Cons

  • Slightly expensive

If you own a bike, then an accessory you absolutely need is a bike lock.

It is the best way to easily secure your bike at home and in public.

There are many different brands and types of bike locks on the market, so how can you figure out which one is best for your needs? 

If you are looking for a good bike lock and are considering the Seatylock Pentagon Bike U Lock, this review can help you in your decision-making process.

SeatyLock Pentagon Bike Lock

SeatyLock Pentagon Bike Lock

Seatylock is known for their innovative designs and understanding of bike culture.

Hence it just makes sense that their premiere U lock would be the most strong, secure, and reliable, while also conserving weight, and eliminating inconveniences like difficult mounts and rattling locks.

The Pentagon is a Gold rated bike lock that lives up to its heritage.

Seatylock is known for ultra-secure, high quality bike locks with incredible design and features.

They are a team of avid cyclists and innovators.

Their products have been featured in everything from the Los Angeles Times, The Telegraph, and Sports Illustrated to CNet, Gizmodo, Gear Hungry, and Tech Crunch. For bike locks designed by bikers for bikers, Seatylock is a great company.

Who is this product for?

The Seatylock Pentagon is a U lock for riders who are serious about protecting their bikes.

The pentagonal crossbars, double deadbolt, and anti-drilling components have earned the Pentagon a Gold rating from Sold Secure.

This makes this lock incredibly difficult to break or defeat.

It also has the widest clearance of any U lock in the market, making it a great choice for electric bikes, scooters, mopeds, and other larger-frame vehicles.

It comes with three keys, so you always have a spare, which is helpful for people who struggle to remember combinations and prefer keyed locks.

What is included?

The Seatylock Pentagon comes with:

  • 3 Keys
  • A unique registration code that allows the company to help you replace your keys if necessary
  • A mounting bracket with an anti-rattle mechanism that keeps it silent while you ride, and 3 axis of rotation for perfect fit and positioning
  • Some fun Seatylock stickers

Overview of features

The Seatylock Pentagon is made of hardened steel that is over ½ inch thick, with a patented pentagonal crossbar design that adds further strength.

It is a generous sized lock, with the widest clearance on the market, giving you plenty of room for hard-to-fit places.

The double-deadbolt design protects the lock from twist attacks and the lock and cylinder are drill-resistant.

A dual-lock design also improves your security by requiring a thief to cut or saw both crossbars of the lock, not just one.

The lock is coated to protect it from rust and UV degradation over time, which also protects your bike frame from scratches and abrasions.

The Seatylock Pentagon also has a rattle-elimination mechanism that keeps the lock quiet when mounted on your bike.

This lock has been awarded a Gold rating by Sold Secure - one of the best lock rating organizations in the world.

It can't be sawed, hammered, drilled, frozen, or cut with any standard tools.

This lock resists picking or twisting.

The Seatylock Pentagon comes in two sizes:

  • Seatylock Pentagon 220 measures 8.66 inches long by 4.53 inches wide, and weighs 3.3 pounds
  • Seatylock Pentagon 300 measures 11.8 inches long by 4.53 inches wide, and weighs 3.75 pounds

How to use the Seatylock mounting bracket

The Seatylock mounting bracket is designed for pentagonal U locks, and will hold the lock securely without rattling.

It's a great multi-axis design that allows for versatile positioning on nearly any bike frame (or scooter, or other vehicle).

This versatility is great for people who already have bottle cages and other mounts attached to their bike frame.

However, it needs to be mounted correctly for optimal balancing and silent operation.

Seatylock has produced a great video that shows exactly how to mount the bracket for the most security and a comfortable, quiet ride. 

Because the Seatylock Pentagon is a big, heavy bike lock (although it's lighter than comparable locks with Gold security ratings), you will want to mount it close to the middle of your bike.

This will preserve the center of gravity, even though the bracket will allow you to position it almost anywhere.

For long-term maintenance, particularly in damp or wet climates, regularly wipe the ends of your U lock clean and use a light coating of grease or lubricant (an aerosol lithium grease is a great choice. See here for Amazon's price).

This will help prevent corrosion and keep the U lock shackle working properly over time.

Pros

  • Awarded highest security rating possible by Sold Secure
  • Patented pentagonal bars provide extra strength without adding weight
  • Double deadbolt protects against twist attacks and is a strong deterrent
  • Can't be cut, sawed, drilled, or frozen
  • Weighs less than other U locks with the same security level
  • Wide internal clearance allows you to securely attach the lock to many lamp posts, traffic lights, and other objects
  • Coated for rust protection, scratch protection, and UV resistance
  • Versatile universal mounting bracket
  • Quiet, no-rattle design
  • Comes with 3 keys
  • Seatylock will help you replace your keys on a registered lock

Cons

  • Slightly expensive

Alternatives

The OnGuard Pitbull

If you are looking for a highly secure U lock with a slightly lower price tag, consider the OnGuard Pitbull.

Like the Pentagon, the Pitbull has a wide interior, a double-lock design, and comes with a multi-position bracket.

It comes with 5 laser-cut keys, and a micro-light for high visibility.

The crossbars are slightly slimmer than the Pentagon, at 14 mm, and it doesn't have the patented pentagonal bars.

Overall the OnGuard Pitbull has a slightly lower quality than the Pentagon, with a less smoothly operating lock mechanism, a lower-quality bracket, and other little details.

However, the OnGuard Pitbull still scores very high on security under independent tests, and has a lower purchase price than the Seatylock Pentagon.

Conclusion

The Seatylock Pentagon is a superior U lock that is virtually theft-proof.

The innovative pentagonal bars preserve strength and security while shaving weight off of the lock.

Thoughtful details like the versatile, high quality mounting bracket, the smooth lock operation, UV coating, and a rattle-free ride are indicators of both the quality of manufacture and the bike-riding culture of the Seatylock company.

These guys know what people are looking for.

It's an excellent choice for a high security U lock. 

Or, for a similar but more affordable option, consider the OnGuard Pitbull.

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