Wheel & Seat Locks

It’s not just whole bikes that excite thieves. They love wheels and seats too. And baskets and brakes. And all the other removable components on your bike. In fact, if you leave your bike for long enough you’re likely to return to this…

A stripped bike

But the most commonly stolen bike parts are definitely wheels and seats. One reason for this is that many bikes are now fitted with “quick release” skewers. These are clamps that allow you to easily remove your wheels or seat without using tools.

Quick release lever on a wheel

Very handy if you need to take your wheel off quickly to repair a puncture or want to adjust your seat height. But unfortunately they are also an open invitation to anyone with criminal inclinations…

Because if your bike has quick release clamps, unless you use some additional security, anyone passing your bike can simply push open the clamps and walk off with your wheels or seat. No tools needed.

What can you do to stop this? Well the most popular way to discourage this is to use a thin cable lock like this…

Kryptonite Kryptolok Series 2 cable

This type of long, looped cables are often sold and used with U-locks. The idea is that one end is attached to your U-lock and the is looped around your wheel or your seat (or both)…

U-lock and cable lock

A looped cable used with a U-lock to secure the front wheel

The problem with this method is that these cables can be snipped through with the most basic wire cutters in a matter of seconds. And since all bike thieves carry wire cutters, if your wheel or seat is not stolen while secured like this, it’s only because the thief can’t be bothered!

Surely there’s a better option?

Well, you could simply replace the quick release skewers with bolt on skewers. Whereas quick release levers can be tightened and loosened by hand, with bolt on skewers you usually need a Hex (Allen) key.

Replace quick release skewers with bolt on skewers

Replace your quick release skewers with hex skewers

Both Nashbar and Halo make good quality, inexpensive bolt on wheel skewers which are easy to fit yourself. And for the seat you can either replace the whole seat post clamp or get a normal bolt for the existing collar.

Of course they won’t stop a thief with a Hex key! But in my experience, they are a deterrent on low value bikes. And they’re relatively cheap.

But if your wheels and seat are even vaguely attractive, or you live in a high theft area, you’re going to have to do much more than this.

Ideally, your locking strategy should include two locks that secure both the bike and the wheels. But what about the seat? Let’s have a look at some other options. First the seat and then the wheels…

How to prevent your bike seat from being stolen

I’m sure there’s loads of things in life more annoying that having your bike seat stolen. But when it happens to me, I’m hard pressed to think of any.

I’m not sure if it’s the public humiliation of riding a seat-less bike back home, the physical exertion of a journey without being able to sit down, or the pettiness of the theft itself. Whichever it is, it’s enough to make a peaceful person harbor violent thoughts. But what can we do to prevent it?

Wheel and seat locks

The most extreme solution is to remove your seat post and take it with you every time you leave your bike. This will certainly stop anyone stealing it. But what a pain. And for me this option stinks of defeat.

It’s an admission that the thieves have won. We are reduced to carrying around a grubby, cumbersome piece of metal everywhere we go. This is not why I ride a bike. There has to be a better option. Surely?

You could thread a cable lock through the seat rails and then around the space between the seat stay and the seat tube. This fastens the seat to the bike frame. But cable locks can be cut through very, very easily.

Using an old bike chain rather than a cable lock provides a bit more security as a chain is more difficult to cut. This is an increasingly popular option. However, it does attach your seat to the bike frame more permanently, so make sure you’re happy with your seat height first.

Bike chain seat lock

A bike seat secured with an old bike chain

You can stop the bike chain from damaging your frame by encasing it in an old inner tube. It’s pretty simple to do the whole thing yourself and there are videos on YouTube…

Or many bike shops will now do it for you for a small fee.

Of course bike chains can still be cut and some thieves may even carry chain breakers. So a further option is to make it more difficult for a thief to loosen the seat post clamp. There are two main ways to do this:

  1. make a standard clamp difficult to unscrew
  2. buy a special secure skewer for your clamp.

1. Make a standard seat clamp difficult to unscrew

So you’ve replaced the quick release lever with a standard Hex screw clamp. But a thief with a Hex key can still steal your seat very easily.

You can make a standard clamp difficult to unscrew by filling the socket with something that prevents a tool being used to loosen it.

Whatever you use, should be difficult to remove. But the thing to remember is that the more difficult it is for a thief to remove, the more difficult it will also be for you should you want to make some adjustments!

What to use? There are a few different options. For example, super gluing a ball bearing into the socket is a popular choice. Simply find a ball bearing that fits snugly into the socket, slather it in super glue and press it into the socket…

Ball bearing in seat clamp

Should you later need to remove the ball bearing to make some adjustments, you can use acetone or Z-7 Debonder to dissolve the glue.

Other materials you could use to fill the socket include steel epoxy, solder, Sugru or candle wax. Each one provides a different level of security depending on how difficult it is for a thief to remove.

Don’t forget, the more secure it is, the more difficult and frustrating it will be when you need to remove it! But in fact, this technique is very effective and can be used to secure any of your bike components.

If this method is too much hassle, then there is a more elegant (although more expensive!) alternative. Hexlox work in exactly the same way by filling the hex socket with an obstacle that prevents an Allen key from inserted to loosen the clamp.

A Hexlox

A Hexlox!

However, in this case the obstacle is a small metal nut that’s held in place by a magnet. According to the manufacturers it can’t be removed by a stronger magnet (since it’s protected from above by a non-magnetic steel shield), by tweezers, gator grips, screw drivers and several other tools and methods that hadn’t even occurred to me!

The only way to remove it is with the specific key that comes with your Hexlox. What I really like is that it doesn’t require you to change your existing set up, it’s quick and easy to install and it’s relatively cheap! Read my full, hands on review of the Hexlox here.

2. Buy a secure seat clamp

If you don’t fancy these DIY options, you can also buy specially designed, secure seat skewers. These can work in a number of ways.

Some of them use non-standard socket shapes and keys. Others use gravity to lock the levers when the bike is in an upright position (as it always should be when it’s locked up).

These skewers are also available for wheels, so I’ll look at them in more detail in the next section. But here’s a quick summary of what’s available specifically for seats…

Locking skewers for Seats

Locking SkewerModelLocking SystemSeat Tube SizesCheck Price
Pinhead seat collar with lockPinhead Seatpost
Collar and Lock
Unique Key28.6 mm - 31.8 mm
34.9 mm
Check price
Pinhead seat collarPinhead Seatpost
Unique Key28.6 mm - 31.8 mm
34.9 mm
Check price
Pinhead saddle lockPinhead Saddle
Unique KeyAllCheck price
Pitlock seat lockPitlock Seatpost
Unique Key33 mmCheck price
Abus NutFix seat lockAbus NutFix Seatpost lock
Gravity28.6 mm
31.8 mm
34.9 mm
Check price
Zefal seat lockZefal Seatpost
GravityAllCheck price
IXOW Safering GravityIXOW SaferingGravity28.6 mm
31.8 mm
34.9 mm
Check Price at IXOW
IXOW Safering KeycodeIXOW SaferingUnique Key28.6 mm
31.8 mm
34.9 mm
Check Price at IXOW

However ultimately, if a thief really really wants your seat, he can saw through the seat post. So if you’ve got a nice seat, maybe the best option is to take it with you?

How to prevent your bike wheels from being stolen

As I talk about further in the how to lock your bike page, ideally your locking strategy should include two locks. One secures the back wheel and the frame to the bike rack. The other secures either the front wheel and the frame to the bike rack or just the front wheel to the frame.

Securing bike with 2 locks

Securing your wheels with 2 locks

Or, if you’ve only got one lock and have quick release wheels, you could remove the front wheel and lock it together with the back wheel and the frame.

Securing both wheels with 1 lock

Securing both wheels with 1 lock

However, neither of these methods is ideal. Decent bike locks are heavy and cumbersome, so carrying two locks around can be a pain. As is removing your front wheel every time you leave your bike somewhere.

Surely there must be a more convenient way to protect our wheels? Well, yes there are. Depending on what type of wheels you have, they’re called either “locking skewers” or “solid axle locks”. But which one do you need?

If your bike has quick release wheels like in the the photo below on the left, then you have “hollow axle wheels” and would replace the existing skewers with “locking skewers”.

If your bike has nutted wheels like in the photo below on the right, then you have “solid axle wheels” and would replace the regular nuts with “solid axle locks”.


On the left, a quick release skewer. On the right a nutted solid axle

These locks are available for both wheels and seat posts and use various ingenious methods to stop unwanted hands from unscrewing them. They’re certainly more convenient than carrying two U-locks around or removing your front wheel every time you want to lock your bike.

But how secure are they? Well that depends on which ingenious locking method they use. Broadly speaking, there are three different methods:

  1. those that use “unique” keys
  2. those that use “non-standard” keys
  3. those that use gravity!

Locks with Unique Keys

pinheadThese work just like normal hex skewers or nuts. Except that in each set, the heads are a “unique” shape. And you use a special “unique” key to tighten and loosen them.

Because they’re unique you can only use your specific key to unlock your specific nuts.

In actual fact, they’re not strictly unique. But there’s a huge number of different key combinations, so the chances that anyone else will be able to unlock your skewers are very, very small.

Of course, when you want to remove your wheels or seat you need to have your special key handy. However, to me this seems a small inconvenience.

And at the moment these are the most secure type of wheel and seat locks available. However, there are just two companies offering locking skewers and solid ankle locks with “unique” keys: Pinhead and Pitlock.


Pinhead wheel skewersWith Pinhead skewers, there are 11,500 different key combinations. Each key is engraved with a nine digit code that you can use to order replacement keys or more matching locks.

And you can even register your key online so you don’t have to remember the code.

They are available for wheels, seats, and even headsets. And they produce versions for both quick release wheels and solid axle wheels.

Do they work? Well generally yes. It is possible to unscrew the heads without the special key, but it takes a fair bit of time and effort. And most thieves will not have the tools.

I should mention that with older Pinhead models, it was possible to unscrew the head relatively easily with a Gator Grip universal socket. However, the skewers now come with POG washers that prevent this happening.

There are also some reports of them coming loose over time. So you should always carry your key with you to tighten them up. But I’d imagine you would always want to have the key handy anyway, in case you have a puncture.

Overall, I think the Pinhead skewers are great. They will never be as secure as a second lock. But they’re far more convenient. And they’re far more secure than any cable lock.

I would certainly trust them on shortish trips. But I might be wary about leaving a bike for a long period of time in a high theft area with only Pinheads protecting my wheels.


Pitlock wheel skewersPitlock skewers boast over 1000 different key combinations. And they have the added security of a smooth shield of steel which surrounds the head and prevents any other tool being used to loosen it.

There are locks for both wheels and seats. And for both quick release wheels and solid axle wheels.

Each key comes with a code card enabling you to order replacement keys and further matching locks. And as with Pinhead, you can also register this code online.

Unlike the Pinhead key, the keys that come with the Pitlock have no lever, so in order to use them you will need to use a 10 mm spanner or insert another tool such as an Allen key into the hole to get enough leverage to screw and unscrew the nut.

Pitlocks have a slightly better build quality than Pinheads and are a bit more secure. However, they are also more expensive and not quite as easy to use. But if you’re looking for the ultimate protection, they are probably the safest locking skewers available today.


IXOW wheelguard with keycode

While they don’t quite match the “uniqueness” of Pinhead or Pitlock, there are more than 40 different key combinations for the security skewers (and seat clamps) from IXOW.

The key is a small cylinder with a recess that fits a hex key at one end and a series of protruding spikes at the other. These spikes fit into a matching series of holes on the heads of the skewers or clamps.

So if you stick a hex key in one end and the spikes in the holes, you’re able to tighten or loosen your skewers and clamps. Easy! Each set features a slightly different distribution of spikes and holes which makes this solution more secure than the simpler non-standard key option.

And you get a service card which enables you to register your specific key so that you can order a new one should you lose the first.

While they won’t be as secure as Pinheads, these skewers are certainly likely to deter the casual thieves which make up the vast majority of seat and wheel robbers!

Locks with Non Standard Keys

Delta Hublox Security SkewersThese work just like the previous locks. Except that they all have the same, albeit non-standard shaped heads and keys.

This means someone with a standard tool set shouldn’t be able to unscrew them. However, since all the keys are the same, anyone who owns the same brand as you, will be able to unscrew them.

So a thief who bought one would have easy access to all the wheels and seats locked with the same brand. On top of this, they can usually be opened easily with a Gator Grip universal socket.

All this means they’re obviously much less secure. And while they’re also much cheaper, I’m not sure that they provide much more protection than standard Hex skewers or nuts.

And don’t forget, you only get the one key, which you’ll need to keep with you and if you loose it, it’s usually impossible to get a replacement (without buying another set!).

In the US, the Delta Hublox Security Skewers are perhaps the best of these non standard skewers. While in the UK, ETC and Trans-X are reasonable quality, although there are some reports that they can be unscrewed with pliers from the other end!

But I think that if you’re concerned enough about your wheel and seat security to consider upgrading your standard skewers or nuts maybe it’s worth spending the extra money on one of the other methods.

Gravity based Locking Skewers and Nuts

Upside down bikeThere are five main brands making these gravity based skewers and nuts: OnGuard, Zefal, Kryptonite, Abus and IXOW. And they all work in more or less the same way…

While your bike’s upright they’re locked and cant be unscrewed. In order to remove them, you need to turn your bike over. At this point, the gravity based mechanism is released and you’re able to unscrew the component.

How is this secure? Well, if your bike is locked up properly, it should be very difficult to turn it over into a position where the mechanism is released and the component can be removed!

OnGuard and Zefal Locking Skewers

Zefal Security SkewersAs far as I can tell, the OnGuard skewers are actually re-branded Zefal skewers, so I’ll deal with them at the same time.

Zefal skewers look just like normal quick release skewers. But once closed, the lever can’t be re-opened unless the bike is turned upside down. And if a bike is properly secured to an immovable object, any prospective thief won’t be able to turn it upside down.

The great advantage of these skewers is that you don’t need to carry around an extra tool to unlock them. When the bike is upside down they work just like normal quick release skewers. It’s a great idea. Unfortunately though, it’s not that difficult to bypass the security…

For starters, they can sometimes be opened by a trick with a magnet which you can find by digging around the internet. But much more significantly, while the lever side may be secure, the nut on the other side of the skewer can easily be twisted off with a pair of pliers!

The other problem is that because they look like normal quick release skewers, thieves are more likely to try to force them open. This could damage your bike or even the skewers themselves to the extent that they’ll no longer open at all.

Kryptonite Gravity WheelNutz and WheelBoltz Locks

Kryptonite WheelBoltzThe Kryptonite locks work on the same principle as the Zefal skewers. That is, the bike has to be turned completely upside down to release them.

However, the similarities end there. The Kryptonite locks are available for both solid axle wheels (as WheelNutz) and hollow axle wheels (as WheelBoltz).

They are fitted and removed either with a 15 mm wrench (WheelNutz) or a 5 mm hex wrench (WheelBoltz), so they don’t look anything like quick release skewers.

And most importantly they can neither be defeated with the magnet trick, nor twisted off from the other side with a pair of pliers! They’re much more secure than that.

So the Kryptonite wheel locks are definitely a step up from the Zefal offering. But of course they’re more expensive too.

Abus NutFix Wheel and Seat Locks

Abus Nutfix setThe Abus locks are similar to the Kryptonite gravity locks in that they’re available for both solid and hollow axle wheels. However there are important differences too.

Unlike Kryptonite, Abus offer seat locks as well as wheel locks. And they’re available in a range of snazzy colors. You use a 5 mm spanner to fit both the solid and hollow axle models.

But most significantly, to release the gravity mechanism, you turn the bike on it’s side rather than upside down. To me this seems a little less secure and it’s definitely not as practical when you’re trying to change a tire.

However, they’re so easy to fit and work so well, I think they’re a great choice if you’re looking to replace a secondary cable lock. Read my full, hands on review of the Abus NutFix wheel locking skewers.


IXOW wheelguard gravity

As well as the “unique” keyed solutions, IXOW also provide gravity protected skewers and nuts. Plus a seat clamp!

They work in the same way as the Kryptonite solution in that they’re tightened and loosened with a hex key and the bike must be completely upside down to release them.

As long as you remember to lock your bike so it can’t be turned upside down, then I find this method works really well and you’re very unlikely to suffer a theft. Read my full, hands on review of the IXOW wheel skewers here.

So, as you can see, when it comes to wheel security there’s a fair few options, with different methods offering different levels of protection at different prices. Here’s a round up of the secure skewers that are available for bikes with quick release wheels…

Locking skewers for Wheels with Hollow Axles

SkewersModelLocking SystemLengthsCheck Price
Pinhead wheel skewersPinheadUnique Key125 mm
160 mm
Check price
Pitlock wheel skewersPitlockUnique Key119 mm
155 mm
Check price
Delta Hublox wheel skewersHubloxNon-standard Key95 - 115 mm
128 - 148 mm
Check price
Kryptonite WheelBoltzKryptonite WheelBoltzGravity130 mm
150 mm
Check price
Abus NutFix Wheel SkewersAbus NutFixGravity120 mm
150 mm
Check price
Zefal Security SkewersZefalGravity123 mm
168 mm
Check price
Onguard wheel skewersOnGuardGravity123 mm
168 mm
Check price
IXOW Wheelguard GravityIXOWGravity100 mm
135 mm
Check Price at IXOW
IXOW Wheelguard KeycodeIXOWNon-standard Key100 mm
135 mm
Check Price at IXOW

And here’s a round up of the solid axle locks for bikes with regular nutted wheels…

Solid Axle Wheel Locks

SkewersModelLocking SystemSizeCheck Price
Pinhead solid axle wheel locksPinhead M9
Front Wheel Lock
Unique Key9 mmCheck price
Pinhead solid axle wheel locksPinhead M10
Back Wheel Lock
Unique Key10 mmCheck price
Pitlock solid axle wheel lockPitlock M9
Front Wheel Lock
Unique Key9 mmCheck price
Pitlock solid axle wheel lockPitlock M10
Back Wheel Lock
Unique Key10 mmCheck price
Abus NutFix wheel nutsAbus NutFix M9
Front Wheel Lock
Gravity9 mmCheck price
Abus NutFix wheel nutsAbus NutFix M10
Rear Wheel Lock
Gravity10 mmCheck price
Abus NutFix wheel nutsAbus NutFix 3/8"
Wheel Lock
Gravity3/8"Check price
Kryptonite WheelNutzKryptonite
WheelBoltz M9
Front Wheel Lock
Gravity9 mmCheck price
Kryptonite WheelNutzKryptonite
WheelBoltz M10
Rear Wheel Lock
Gravity10 mmCheck price
Kryptonite WheelNutzKryptonite
WheelBoltz 3/8"
Wheel Lock
Gravity3/8"Check price
IXOW Wheelgaurd NutsGravity3/8"Check Price at IXOW

You can also buy packages where you get the wheel and seat locks together. Here’s a round up of those…

Locking skewers for Wheels and Seats

SkewersModelLocking SystemCheck Price
Pinhead 2 wheels 1 seatPinheadUnique KeyCheck price
Pitlock 2 wheels 1 seatPitlockUnique KeyCheck price
Trans-X 2 wheels 1 seatTrans-XNon-standard KeyCheck price
ETC 2 wheels 1 seatETCNon-standard KeyCheck price
Zefal 2 wheels 1 seatZefalGravityCheck price
Onguard 2 wheels 1 seatOnGuardGravityCheck price

Wrapping up

Wheel security is relatively straightforward. If you want to be 100% sure your wheels are safe, you need to secure them both with good U-locks or chains

For the back wheel, you should be able to use the same lock you use on your frame. For the front wheel, you would need a separate lock. Either a small U-lock that just locks the wheel to the frame. Or for better overall security, a slightly larger U-lock that can lock the wheel to the frame and the bike rack.

If this is too expensive, or too heavy or just too inconvenient, then there are alternatives. You could replace your existing wheel skewers or nuts with secure ones…

The most secure of these are those with “unique” keys such as Pitlock or Pinhead. The ones that use gravity from Abus and Kryptonite are probably the next most secure. And least secure (although still far better than quick release) are the ones with non-standard keys such as those from HubloxETC and Trans-X.

Seat security is a little more complicated. You can of course buy the same secure skewers and nuts that you can get for wheels. Or you can try one of the DIY options such as fastening an old bike chain through the seat and frame or super gluing ball bearings in the screw heads.

Ultimately though, if thief really wants your seat, he can saw through the seat post relatively easily, so I wouldn’t leave a £100 Brooks saddle alone for long, whichever method you employ!

To sum up, I think secure skewers and nuts can provide adequate security for most people in the majority of situations. And they’re so much more convenient than a second lock. But when you really, really want to be safe, use two locks!

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