The clue is in the name, of course, and with two full size cylinders sitting side by side, the TC looks an imposing piece of machinery, but there’s method in Air Arms’ eye-boggling design.

S510Getac

If the seal that is part of the bearing fails, moisture and dirt can enter the bearing’s grease, compromising the grease’s ability to keep the load bearing elements (balls and races) lubricated. But there are times when a bearing destroys itself even though the grease is not compromised. Tiny particles of metal can begin to flake off of the races, and when this happens, those particles mix with the grease so that it becomes a grinding compound of sorts, creating a “snowball” effect whereby more metal flakes off and enters the grease charge and the bearing gets noisier with time.

It’s a very clever idea, and definitely gives this model a USP, for those who appreciate something a bit different. So just what are we getting for the asking price? A central shrouded Lothar Walther barrel for a start; the multi-shot S510 action, two ten-shot cassette magazines, Air Arms’ ‘T’ bar charging valve, side-lever action, two-stage trigger, threaded muzzle, integral pressure gauge, safety catch, and that Superlite-style beech stock.

S510Bobcat

Daring to be different and standing out from the crowd, brings risk, but top British brand Air Arms, did just that, when they launched their S510 TC Twin Cylinder special, some eight or nine years ago. OK granted, it is still technically barrel-over-cylinder, but look closer and there’s a lot more to it than that! I became a fan the minute I set eyes on it, so let’s get a closer look at one of the most unusual PCPs currently available, and see just why it remains such a popular alternative in their product line-up.

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Air Arms could see the popularity of such guns, but clearly wanted to approach the problem of shot count in a different way. The Twin Cylinder concept was mooted, and after some final tweaking, the S510 TC was born. By joining two conventional air cylinders, and placing them alongside each other, the shooter has the feel and heft of a conventional airgun, yet with a vastly increased shot count. Having said that, after initial mounting of the TC in the shoulder, the twin cylinder configuration, unsurprisingly, has overtones of a double barrelled side-by-side shotgun too, and as such, feels fairly unique.

Wheel bearings are in a hostile environment and are working very hard, but wheel bearings are very tough – they’re designed for the work they do. But product variability is a real thing, and again, some bearings fail while others never do.

Remember, the wheel bearing not only allows the wheel/tire assembly to rotate along with the hub the wheel is bolted to, the bearing also carries the weight of the vehicle and maintains the spinning wheel’s axis by keeping it in a straight line. A failed wheel bearing won’t usually allow the wheel to come off completely unless the bearing has become so hot that the axle or spindle is glowing red. Not only can this cause a fire in the wheel well area, the wheel and hub can separate from the vehicle and… well, finish the thought. Granted, this is a very extreme case of a wheel bearing failure, but wheel bearings that have lost their grease can get extremely hot.

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Interest in the ‘buddy bottle’ style of airgun has grown exponentially over the last couple of decades, but whilst this configuration guarantees the owner a huge number of shots per fill, the profile can be clumsy, to say the least. Add in the high probability of having to grip a cold metal bottle up front, in place of a proper fore end, and many shooters, including me, are less than enticed.

Wheel bearings support the weight of the vehicle and allow the wheel/tire assembly to rotate when you’re traveling down the road. All four of your car’s wheels have wheel bearings and they are designed to last the life of the vehicle. In fact, many vehicles will travel hundreds of thousands of miles/kilometers and never need a wheel bearing replacement, but others may need one or more wheel bearings replaced over their lifetime.

Once again, there are other issues besides a bad wheel bearing that can cause steering wheel vibrations. A thorough diagnosis is needed to verify the cause of the concern.

If your wheel bearing goes out while you’re on the road, it’s not advisable to keep driving. However, if there’s absolutely no alternative, make sure to maintain a slow and steady pace—do not accelerate or turn suddenly.

BobcatS510problems

It’s this abnormal sound that’s the most obvious sign something is wrong with your wheel bearings. Of course, because other issues, such as cupped tires, can mimic a bad wheel bearing, you’ll want to diagnose the sound properly.

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In cases like that, or when you just decide to keep driving until the failure is complete, the bearing itself will decide for you when it must be changed, and it can do so in very unpleasant ways and never at a good time. In other words, there are instances, when left unattended to, a faulty wheel bearing can create hazardous conditions, such as the following:

Thank for pointing out that typo. The paragraph was supposed to read: Some front-wheel drive vehicles have wheel bearings of this type on the rear. We have updated the article.

Also, by replacing a bad bearing early on, you can also save yourself a lot of money by avoiding possible major repairs.

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In the event that this happens under weather conditions that make the road slippery, immediately maneuver your vehicle to the nearest safe spot off the road.

Is your ABS light on, and you do not know what is causing it? A faulty wheel bearing can be a possibility. On some vehicles, the ABS sensor or encoder ring is integrated into the wheel hub and bearing assembly. As such, a failure of the wheel bearing can trigger the ABS light.

There are different kinds of wheel bearings depending on the year model and the design of the vehicle. Older rear wheel drive vehicles had cone type wheel bearings on the front wheels that could be removed, inspected, and packed with grease, and reinstalled with new seals. Some front-wheel drive vehicles have wheel bearings of this type on the rear. In other words, if a vehicle has cone-type bearings that can be removed, inspected, and repacked, it will always be on the NON-driving wheels – the ones that don’t propel the vehicle. Trailer wheels often have bearings of this type.

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BobcatS510specs

30306. (a) Any person, corporation, firm, or other business enterprise who supplies, delivers, sells, or gives possession or control of, any ammunition.

Since the wheel bearings keep the wheel and hub assembly spinning on an axis, if the wheel bearing is compromised to the point that it can no longer maintain that axis, driving with a faulty bearing can be extremely dangerous—especially at high speeds. Think about a wheel that starts wobbling because the bearing decided to completely come apart while you’re in freeway traffic. This can happen without warning if you’ve become accustomed to the bearing’s noise as it continues to warn you by getting louder.

When you’re driving with the music cranked up, you may not notice the different sounds that your vehicle makes. But the moment you turn the radio off and notice a growling, humming, or rumbling noise coming from your wheel bearing, you’ll know there’s a problem.

It’s worth noting that tire noise will usually change depending on the road surface. Wheel bearing noise, on the other hand, is consistent regardless of road surface and acceleration.

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

I have personally seen a Crown Victoria that was making a noise I would have sworn was coming from the left rear axle bearing, but after removing and inspecting that bearing (which is difficult on a rear wheel drive vehicle), I discovered that the noise was actually originating from the left front tire. And I had nearly 40 years of automotive experience at the time.

Loose wheel bearings can throw your car’s alignment off, leading to abnormal tire wear. There are, of course, many other problems that can create the same, undesirable results.  So, you’ll want to diagnose the issue thoroughly before condemning one or more of the wheel bearings

Consider the modern pre-charged pneumatic, and that much-copied, barrel-over-cylinder design crops up time and again. It’s fairly logical and it works well, but it’s fair comment to conclude that a plethora of models available lack original design, and are instead just variations on a well-trodden theme.

Can your car still run with a faulty bearing? The technical answer might be yes; some wheel bearings might continue to operate normally despite the vehicle being driven with one or more noisy bearings for a very long time. The problem is that since the noise begins gradually and slowly gets worse, you might not even notice the noise if your vehicle is noisy in other ways.

Wheel bearing noise coincides with the rotation of the tires. The sound typically increases with vehicle speed as well. In some instances, the noise may also change when you turn the steering wheel in one direction or the other.

Mechanics will find a safe, empty, smooth paved road, then listen carefully to the noise while swerving gently from side to side – typically when you swerve to the right, you’re increasing the load on the left side bearings, and vice versa. And again, while this is a good practice, it’s easy to be fooled into replacing the wrong bearing, even using this method – that’s why some tire shops replace bearings in pairs. If you use this method and believe the noise is tire related, you can move the front tires to the rear and see if the noise changes.

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BobcatS510price

Another tricky element of wheel bearing noise is the need to pinpoint which wheel bearing is making the noise. Sometimes even professional mechanics will struggle with this, and there are special listening devices shops use to pinpoint which bearing is making the noise. Some tire shops will replace both front bearings if there is a bearing noise coming from the front of the vehicle; not a bad practice, actually.

By now, you may have an idea of how important wheel bearings are. Thankfully, there are signs that can indicate that your wheel bearings are going bad.

A faulty wheel bearing can cause your vehicle to pull to one side during braking. This symptom can also be related to faulty brake components.

The older style cone shaped bearings have a series of tapered rollers in a cage with a window for each roller to keep them evenly spaced while they ride between inner and outer races. But most modern sealed bearings have steel balls with inside and outside races.

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Some may say that you can drive for up to a thousand miles with a failed wheel bearing—but the thing is, this is an arbitrary claim. There’s really no telling how long you can safely drive your vehicle in this state. It would depend on the severity of the damage to your wheel bearing, present road conditions, and other factors. So, it’s best not to push your luck.

You might have seen a vehicle pulling trailer that has had the bearings neglected to the point that the wheel gets hot enough to set the tire on fire – it can happen on your vehicle in extreme cases, but it’s rare.

S510abortion

As mentioned, my test gun came specified as a carbine version of the S510TC, and this tips the scales at 7.2lbs, which is surprisingly modest. Opt for the rifle size, and this increases to 7.7lbs, so reasonable either way. The clever design sees two cylinders joined together, yet internally connected and sharing just one filling valve. In other words, the two cylinders create one large chamber, the barrel sitting within a shroud between the two. A soft ‘O’ ring clamp holds the cylinders and the barrel, and all are given a full matte coating, rather than conventional chemical bluing. The cylinders themselves are specified as being constructed from aerospace-grade aluminium, which sounds reassuring. Air Arms are well known for their serious investment in state-of-the-art CNC machinery, and the quality and precision of machined components, along with the finish overall, is everything we have come to expect from this South Coast manufacturer.

One tricky thing about wheel bearing noise is that a bad tire can make almost exactly the same noise as a bad bearing; you don’t want to replace a wheel bearing for a noise concern when all you need is a new tire.

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As with all the standard Air Arms models these days, not to mention a huge slice of the airgun industry, the wooden stocks are made by Minelli in Italy, and the subtle design fitted to the TC, continues the shotgun theme, with that fully tapered fore end and schnabel tip. My test rifle was supplied in Hunter Green Superlite, but standard beech, lacquered to the same standard, is also available. If you haven’t encountered the Air Arms Superlite design, basically it means that the back end has been scalloped out to shed excess wood. A rosewood cap to the pistol grip comes as standard, as does a decent ventilated butt pad, and a prominent cheek piece for perfect eye scope alignment. I’m not so sure about the ‘in the white’ chequering look, but overall finish and that ambidextrous configuration is hard to fault.

Modern vehicles have sealed wheel bearings that cannot be disassembled without destroying the wheel bearing assembly in the process, and on vehicles with bearings like those, you only know a bearing is bad when it begins to make noise. That’s the earliest indication of a bad wheel bearing, and front wheel bearings (both on front wheel drive as well as rear wheel drive vehicles) are the most prone to fail on modern vehicles.

A faulty wheel hub and bearing assembly can also cause a vibration felt in the steering wheel. Often, the sensation will change with vehicle speed or while the vehicle is cornering.

A worn-out wheel bearing may also make a high-pitched squealing sound while you’re driving. If you are able to observe these symptoms, have your vehicle checked right away. Even if your wheel bearings are not the culprit—there’s definitely something wrong with your vehicle.

The wheel bearing on a wheel usually consists of a pair bearing assemblies running side by side on the shaft or spindle – this keeps the spindle running straight, while a single row of balls or rollers might allow the wheel to wobble. Exceptions would be the non-tapered roller bearings on rear wheel drive vehicles, which will have only one bearing assembly at the wheel end of the axle, but the inboard end of the axle on those units is splined to the differential assembly, which is spinning in its own set of tapered roller bearings.

Air ArmsS510price

Pro Tips are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.

Wheel bearing failure is a potentially dangerous situation at any time, so have your vehicle towed to the nearest mechanic and have your faulty wheel bearings replaced right away. Vehicle safety should always come first.

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

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Note by Richard McCuistian, ASE-certified mechanic: I have personally seen a Crown Victoria that was making a noise I would have sworn was coming from the left rear axle bearing, but after removing and inspecting that bearing (which is difficult on a rear wheel drive vehicle), I discovered that the noise was actually originating from the left front tire. And I had nearly 40 years of automotive experience at the time.

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Pro Tip: If a noise happens after the tires are rotated on a front wheel drive vehicle, it may be due to the wear pattern on the tires, so be aware of that, too.

This paragraph doesn’t make sense: Older rear wheel drive vehicles had cone type wheel bearings on the front wheels that could be removed, inspected, and packed with grease, and reinstalled with new seals. Some rear wheel drive vehicles have wheel bearings of this type on the rear. In other words, if a vehicle has cone-type bearings that can be removed, inspected, and repacked, it will always be on the NON-driving wheels – the ones that don’t propel the vehicle.

Air armss510

Feb 17, 2019 — I would say you aren't getting sufficient oil to the distributor/camshaft gears. The shaft should be pulling oil up that helical groove.

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A bad wheel bearing can cause the brake rotor to wobble, which shoves the caliper piston back into its bore so that when you apply the brakes, you have unexpected pedal travel as a result – making it harder to stop or causing the vehicle to pull unexpectedly to one side – never a good thing in traffic.

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