Kryptonite Evolution Standard (Series 4 > New-U) Review

Kryptonite Evolution Standard (Series 4 > New-U) Review

Last Updated on September 21, 2022 12 Comments

Kryptonite Evolution Standard New-U

Kryptonite Evolution Standard New-U

My score:

Check price:

Shackle thickness:

14 mm


3.5 lb (1.59 kg)

Size (internal):

4 x 9"
(10.2 x 22.9 cm)

Kryptonite rating:


Other Security Ratings:

The Kryptonite Evolution Series 4 Standard was a fantastic lock. But Kryptonite have upgraded it!

And the Kryptonite Evolution New-U Standard [Amazon] is even more fantastic! However, it is very similar to the Series 4, so rather than write a whole new review, I’m just going to update this (the old Series 4 review).

This gives me a chance to talk about what’s changed and explain to anyone arriving here looking for the Series 4 (which you can still buy), why they should go straight for the New-U instead!

Unboxing the Kryptonite Evolution Standard New-U

Unboxing the Kryptonite Evolution Standard New-U

So in this review of the Kryptonite Evolution New-U Standard, first we’ll look at how its evolved from the Series 4 (what’s different).

Then we’ll look at how secure it is, how easy it is to carry around, how best to use it. And finally if it isn’t quite right for you, I’ll suggest some great alternative bike locks.

Kryptonite Evolution Series 4 Standard vs Kryptonite Evolution New-U Standard

So what’s changed is the cross bar. On the Series 4, the crossbar is massive (and oval shaped). On the New-U it’s much smaller. In fact it’s around the same size as the crossbar on the less secure Kryptolok.

But Kryptonite have managed to reduce the size without reducing how secure the lock is (the New-U has the same in house and independent security ratings as the Series 4).

And they’ve achieved this with some subtle changes to the way the shackle locks into the crossbar (more on this later).

Kryptonite Evolution Standard New-U crossbar vs Kryptolok crossbar

The New-U crossbar is almost as small as the Kryptolok crossbar!

What’s important here is that a smaller shackle means a more lightweight bike lock. And while the Series 4 weighed in at a pretty heavy 3.75 lb (1.70 kg), the New-U is just 3.5 lb (1.59 kg). That’s over 6% lighter.

So, if the New-U is as secure as the Series 4 whilst also being significantly lighter, it’s really a no brainer: if you like the look of the Kryptonite Evolution Standard, go for the New-U over the Series 4!

So now we know what’s changed, let’s have a look at the New-U in more detail…

How secure is the Kryptonite Evolution New-U Standard?

At 14 mm thick, the shackle of the Kryptonite Evolution Standard is only 1 mm thicker than the less secure Kryptonite Kryptolok New-U. However, it’s made from a completely different type of steel.

14 mm shackle on Kryptonite Evolution Standard

14 mm shackle on the Kryptonite Evolution Standard New-U

This “max performance steel” is much stronger than the steel used in Kryptonite cheaper bike locks, and provides far more protection against cutting attacks from hacksaws, bolt-cutters and angle grinders.

The shackle is double bolted, so it locks into the crossbar on both sides. This means that it needs to be cut on both sides to open it and gives extra protection against twisting and leverage attacks which are often used to defeat cheaper u-locks.

Double locking shackle with scoops and bumps for extra security

And with the New-U, Kryptonite have given this protection an extra boost. At the bottom of each end of the shackle, there is a “scoop” cut into the steel. These scoops slot into “bumps” at the base of the crossbar.

This means that when it’s locked, the shackle is essentially anchored in four places. At the top, as usual, with the two deadbolts. And now also at the bottom with the two bumps. This makes for a stronger bike lock altogether.

In order to make this work well, the scooped ends of the shackle have to lock into the actual case of the lock, which means the holes for the shackle now extend all the way through the crossbar.

The New-U shackle poking out the end of the crossbar

The shackle goes all the way through the crossbar

This should also stop moisture accumulating in the crossbar and reduce corrosion (which can fuse the shackle in the lock). So there should be less chance of the New-U jamming in this way. Bonus!

So, with these changes Kryptonite have managed to significantly reduce the bulk and weight of the crossbar while still maintaining the security of the Evolution Standard. It gets the same 8/10, in-house security rating as the Series 4.

And the independent ratings back this up. The Kryptonite Evolution Standard New-U has a Gold rating from Sold Secure. And it gets a formidable 3/5 stars from ART. Which is exactly the same as the Series 4.

This is a very secure bike lock indeed!

Is the Kryptonite Evolution New-U Standard easy to carry?

High levels of security usually come at a price: heaviness. And despite the New-U’s reduction in weight (from the Series 4), it’s still no exception to this rule.

Kryptonite Evolution Standard on the weighing scales

The Kryptonite Evolution New-U Standard is lighter than the Series 4

At 3.5 lb (1.59 kg), the Kryptonite Evolution Standard New-U weighs about the same as 4.5 cans of Coke! And this is a pretty substantial amount of weight to be carrying around every day.

Kryptonite Evolution Standard with can of Coke

The Kryptonite Evolution New-U Standard weighs about the same as 4.5 cans of Coke!

You can of course carry the lock in your bag, or attach it to your luggage rack or pannier. But I’d imagine that a good frame mount would be more convenient and preferable for most people.

Kryptonite Evolution Standard in my saddlebag

The Kryptonite Evolution Standard fits easily into my saddlebag

The good news is that the Evolution New-U comes with a Kryptonite “Transit FlexFrame-U transportation system”, which basically allows you to fasten the lock to various parts of your bike’s frame.

FlexFrame-U frame mount

The FlexFrame-U frame mount

The bad news is that, unfortunately, this frame mount (which is provided with most Kryptonite u-locks) is the target of many complaints.

These complaints usually concentrate on two issues. Firstly, that the instructions explaining how to fit the mount to your bicycle are impossible to follow. And secondly, that the mount doesn’t hold the lock securely in place so that it works lose, swings about and sometimes even falls from the bike!

While the instructions are a bit confusing, Kryptonite do provide a clear and helpful video on YouTube which should make fitting the frame mount quite straight forward...

In my experience, the FlexiFrame is a bit more fiddly to install that other frame mounts (such as the one from OnGuard and Zefal).

First you have to install a fabric belt onto the frame. And to do this properly you need to cut a piece of rubber underlay to fit your frame...

The frame mount belt

Then you have to screw the plastic mount (which the lock clips into), on to the belt...

The frame mount clip

The frame mount clip

It’s a bit convoluted and getting the belt on tightly can be frustrating. But with some perseverance, and following the instructions to the letter, it’s always worked out OK on the bikes that I’ve used.

So, some of the problems that people report may be due to the mount not being fitted correctly in the first place (due to not following the instructions properly).

Many others are probably due to the universal nature of the frame mount. Because it needs to fasten to all types of bike frames, invariably it won’t fasten so well to some of them!

Kryptonite Evolution Standard New-U in the frame mount

The Kryptonite Evolution Standard New-U in the frame mount on my bike!

Ultimately, I wouldn’t let any doubts you have about the frame mount put you off buying this lock. If you follow the instructions in the video, it will probably fit your bike perfectly and cause you no problems at all.

And if you do have problems, don’t forget there are alternative ways to carry the lock and there are even third party frame mounts available that might suit your needs.

Is the Kryptonite Evolution New-U Standard easy to use?

The Kryptonite Evolution Standard New-U has exactly the same dimensions as the Series 4. So that means it measures 4” x 9” (10.2 x 22.9 cm) internally. 

Kryptonite Evolution Standard: 9 inches long, 4 inches wide

And this should give you loads of options when you’re looking for somewhere to lock your bike. Bike racks, parking meters, railings and street signs shouldn’t present any problems. However as with all standard size u-lock, wider lampposts will be tricky!

Kryptonite Evolution Standard around seat stays and rear wheel

Securing the frame and back wheel with the seat stays

I like to fasten it around the seat stay and the rear wheel as this keeps it well away from the ground.

Kryptonite Evolution Standard around seat tube and rear wheel

Securing the frame and back wheel with the seat tube

However, although the 14 mm shackle can theoretically be cropped by the very biggest bolt cutters, (if the thief is heavy enough and the lock is close to the ground), in reality this is unlikely. So fastening it around the chain stays or seat post is acceptable as well.

Kryptonite Evolution Standard around chain stays and rear wheel

Securing the frame and back wheel with the chain stays

The Kryptonite Evolution Standard is also available with a cable lasso, which you can use in conjunction with the u-lock to secure your front wheel. However, I’m not a big fan of these cables and I’d urge you to consider all the options before protecting your wheel with this (quite unsecure) method!

Kryptonite Evolution Standard with a cable lasso to secure front wheel

Using the Kryptonite Evolution Standard with a cable lasso to secure front wheel

Also, if you need something longer (perhaps to lock up two bikes at once), then there's the Kryptonite Evolution Series 4 LS [Amazon] which is 2.5 inches (7 cm) longer and slightly heavier.

You get three keys with the Evolution Series 4, one with a LED light to help you find the key hole in the dark.

3 keys with the Kryptonite Evolution Standard New-U

3 keys, one with an LED light to help you in the dark

You are also eligible for the Kryptonite Key Safe Program which will (once you’re registered) send out replacements should you ever lose your keys. The first set is even free!

There’s a sliding dust cover over the key hole which should protect the cylinder from the worst of the street grime and dirt which might otherwise block the mechanism.

Sliding keyhole cover on the Kryptonite Evolution Standard

The Kryptonite Evolution New-U features a sliding keyhole cover

However, you need to be careful that in cold, wet conditions, water doesn’t collect and freeze behind the cover as this will also jam the lock.

I have written much more about lock maintenance, but the bottom line is that if you regularly clean and lubricate this lock, you shouldn’t have many problems.

Does the Kryptonite Evolution New-U Standard include insurance?

The Evolution New-U is eligible for Kryptonite’s Anti-Theft Protection Program which does act as a kind of insurance.

If you opt to take the cover, should your bicycle be stolen as a result of this lock being broken, Kryptonite should pay you up to $2,250 or £1,000 depending on the value of your bike.

I go into much more detail about the anti-theft protection offered by all the brands in the Abus vs Kryptonite vs OnGuard page.

But to summarize here: these schemes are not free, you need to register as soon as you purchase your lock and they impose certain conditions that make it difficult to make a successful claim.

I would advise you to take out separate, specialized bike insurance or get your bicycle covered by your home insurance policy instead, as this will offer more reliable protection.

Kryptonite Evolution Standard New-U Review Summary

The Kryptonite Evolution New-U Standard is one of the very best portable bike locks available today.

It’s a practical size. It provides one of the highest levels of security. And as with all Kryptonite locks, you get fantastic after sales support.

It is a heavy lock though and you may have some trouble carrying around daily. So check the weight before you commit to buying it.

But if you live in a big town or city or cycle on a university campus, you probably need a lock which is rated Sold Secure Gold. And Sold Secure Gold locks are either heavy or small.

Boxed Kryptonite Evolution Standard New-U

Boxed Kryptonite Evolution Standard New-U

If you are confident that you can always find a place to lock your bike in a bike rack then you might want to consider a Sold Secure Gold mini u-lock. But if you feel you might need more options, then a standard sized u-lock is a better choice.

In which case, the Evolution New-U is a great value, standard sized u-lock, offering a high level of security at a very reasonable price. So could it be the lock you’re looking for?

But if you’re still unsure, then my complete guide to choosing the best bike lock may be of help.

Kryptonite Evolution Standard New-U U-lock

The Kryptonite Evolution Series 4 Standard was a fantastic lock. But Kryptonite have upgraded it! And the Kryptonite Evolution New-U Standard [Amazon] is even more fantastic!

Product Brand: Kryptonite

Editor's Rating:

Alternatives to the Kryptonite Evolution New-U Standard

If you’re looking for something lighter, something cheaper or even something more secure then there are of course alternatives. 

Looking for something lighter?

Abus Granit X-Plus 540

The Abus Granit X Plus 540 [Amazon] is a very, very secure bike lock.

Just like the Evolution New-U it’s Sold Secure Gold and was awarded 3/5 stars from ART.

In actual fact, I think it offers slightly better protection than the Kryptonite lock.

And it also comes with a better frame mount and is almost 9% lighter than the Evolution New-U!

So what’s the catch? Well, it’s significantly more expensive. But usually the best things in life cost a little more! 

And for me, the Granit X Plus 540 is the best all round portable bike lock available today. So if the Evolution New-U is just a little too heavy, and the extra cost is not a significant issue, this could be the best lock for you.

Check out my hands-on review of the Abus Granit X-Plus 540.

Looking for something cheaper?

As always, OnGuard offer a similar product that costs just a little less!

The OnGuard Pitbull STD [Amazon] is around the same size and weight as the Evolution New-U.

And it also has a 14 mm shackle and a Sold Secure Gold security rating.

But the OnGuard Pitbull is usually much cheaper than the Kryptonite lock.

You won't get the same level of after sales support and you may need to be slightly more careful with your lock maintenance. 

But the OnGuard Pitbull is a very secure lock at an incredibly cheap price. So if you’re looking for the ultimate value for money in a high security lock, this could be the one for you!

Looking for something more secure?

Kryptonite New York Standard

There aren’t many locks that are more secure than the Evolution New-U.

However the Kryptonite New York Standard [Amazon] is one of them.

With a 16 mm shackle it’s rated 9/10 by Kryptonite, Gold by Sold Secure and has 4/5 stars from ART.

Of course this means that it’s also much heavier than the Evolution New-U. In fact, at 4.35 lb (1.97 kg) it’s almost 24% heavier.

But along with the New York Fahgettaboudit Mini it’s one of the most secure bike locks available today. 

And if you’re looking for a standard sized u-lock that’s even more secure than the Evolution New-U Standard, it’s probably the best lock for you!

The alternatives aren’t right either? Don’t worry, my simple 3 step guide will find the right lock for you and your bike!

Kryptonite Evolution New-U Standard Specs

Kryptonite Evolution Standard New-U

Kryptonite Evolution Standard New-U

My score:

Check price:

Shackle thickness:

14 mm


3.5 lb (1.59 kg)

Size (internal):

4 x 9"
(10.2 x 22.9 cm)

Kryptonite rating:


Other Security Ratings:

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About the author 

Carl Ellis

I've had bikes stolen in London, New York and Barcelona. Yep, I was a serial, international, bike theft victim. In 2015 I decided to stop the rot. And not a single bike's been stolen since! Brakes, yes. Bells, yes. But they're another story. Everything I learn, I document on this website. More about my story. Contact me. LinkedIn.

    • Hi Daniel,

      Theoretically, if it’s less than 16 mm then it can be cut by manual bolt cutters. However, in practice it will depend on a whole host of factors.

      For starters, they would need to be the very biggest 36″ or 42″ bolt cutters. And even then it would depend on how sharp the jaws are, how heavy and experienced the person using the bolt cutters is and most importantly whether the thief can get the lock into a favorable position (close to, or on the floor).

      With this lock, I would say it’s very, very unlikely that it will be defeated out in the street with bolt cutters. You’re more at risk from leverage attacks with scaffold poles, bottle jacks or angle grinders.

      And while you’ll never be able to stop someone with an angle grinder, you can prevent the other two attacks by filling the space inside the lock with as much bike and immovable object as possible.

      This is a really secure lock though, so as long as you’re using it correctly, you can buy in confidence.

      Hope that helps!

      • Thanks for the quick reply!

        I was thinking of getting the New York STD model, but I think I’ll use this lock and combine it with the Kryptonite Evolution LITE Mini-6 for the front wheel.

        Thanks again.

  • Hellow on kryptonite site it says kryptonite series 2 is also made with MAX-Performance, hardened steel is this a upgrade of this model?
    So 13 mm of MAX-Performance, hardened steel so series 2 is exactly like the evolution mini 5

    • Hi,

      The Kryptonite range is very confusing at the moment! But yes, it seems like the Evolution Mini 5 is very similar to the Series 2 Standard. They’re both 13 mm Max Hardened Steel. They both feature the bent foot design. And they’re both Sold Secure Silver and ART 2/5 Stars.

      However Kryptonite rate the Series 2 as 6/10 and the Mini 5 as 7/10, presumably because the Mini 5 is smaller and therefore less susceptible to leverage or car jack attacks.

      The Evolution Series 4 is completely different and definitely an upgrade from the Series 2 though since it’s 14 mm, double bolted, Sold Secure Gold and ART 3/5 stars plus 8/10 from Kryptonite!

      I hope that helps!

  • Hi,
    The rating for this lock was 7-8 on the kryptonite scale… Does it mean that it’s a silver rating rather than Gold? I checked the Amazon page and that’s the only rating I see.

    Moreover, what’s your thought on the Abus STD 430?

  • A cordless grinder will take 3-4 minutes and create lots of noise. A hydraulic cutter is silent and after some pumps it will snap. If the thieves want your bike, they will find a way to take it. So whats a detterrant, an ugly bicycle that looks cheap for starters, maybe a movement alarm, cell phone alerts. Also remember to properly lock your bike up!

  • Thanks for you comprehensive website and all the provided information!

    I’m very interested in buying either this Evolution 4 or the New York Standard. Both share the same frame mount which seems to be a concern for many when it comes to transporting the locks on the bike. You mentioned in the review above “and there are even third party frame mounts available”. Which are these? I haven’t found anything searching the web. Can you please point me in the right direction to third party mounts that are suited for either of these locks?

    Thank you!

  • Thanks for this! I just upgraded to a nice ebike and wondering if I need to upgrade my lock from an evolution series 4 original? I’ve used it for many years without problems but I don’t know if it’s secure enough. I won’t be locking it overnight or anything. Thanks so much!

    • Hi Laura,

      The Evolution Series 4 is a great lock and should be enough in most circumstances, especially if you won’t be leaving your bike for very long.

      If you’re in an area where the thieves are routinely using angle grinders, you might want to look at the new angle grinder resistant lock when it’s released though.

      I hope that helps!


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