O-ring 128x5 FPM 80 ShA Rubena ... O-rings maintain sealing contact force due to their radial or axial deformation within the seal housing between two components.

Wheel HubAssembly Kit

If one tire wears out faster than the others, it could be a sign that the wheel bearings are worn. However, it also could be a sign the tire is improperly inflated (too much air pressure or not enough), the tires are improperly aligned, or the vehicle has damaged or worn suspension components.

Hub and wheel bearingprice

Worn bearings may cause a vehicle to pull to the left or right when brakes are applied. The direction the vehicle pulls signals where the worn bearings are located, on the left or right side of the vehicle. However, this can also signal brake rotor or brake caliper problems.

Next, wipe everything off until it shines like new. If your hub is really dirty, use a solvent such as isopropyl alcohol. As with all hubs, don’t spray solvent on the bearings – only on your rag.

Imagine driving on the freeway when the left front tire and wheel suddenly break off, sending your out-of-control vehicle skidding across several lanes of 65 mph traffic. This is not an exaggeration. This is reality, and can happen if you fail to notice the signs the wheel bearings are deteriorating and need immediate repairs. Your wheel bearing might be bad if you hear unusual sounds like humming, squeaking, or clicking. Some experts say a bad wheel bearing can sound like a bird chirping. Also, if your car wobbles or pulls to one side, you will want to get it checked.

Self-Aligning Double Row Ball Bearings are designed to work in applications where severe misalignment exists whether from mounting or shaft deflection.

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Wheel bearingreplacement cost

Mavic wheels come with a small plastic bearing adjustment tool, which fits on the non-drive side plastic shield. It has standard right hand threads (righty-tighty, lefty-loosey). Simply unthread and remove it:

Wheel hubassembly parts

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Wheel bearings are theoretically engineered to last the life of the vehicle. There is no maintenance schedule for replacing wheel bearings, and there is no constant source of lubrication. However, they can be damaged, leading to failure.

Finally, use the plastic tool to thread the bearing adjustment cap back on. If you want to be super pro, I recommend putting a layer of grease on top of the non-drive bearing as an extra barrier against water and dirt. Bearing adjustment is very easy – thread the cap down until it just stops and fine-tune from there. If the preload is too tight, it will be very apparent (e.g. the hub will have too much drag). Finally, put the small non-drive end cap back on.

Note: We are not covering a full bearing replacement – only covering basic service and freehub replacement. The hubshell bearings require special Mavic tools that I do not have (but most Mavic dealers do have). The good news is that the overall hub design is robust, and full bearing replacement is relatively rare compared to some other ‘race’ hubs.

Even if you own an older or different model of Mavic hub, chances are that the design is similar to the wheel I’m working with today. The Mavic two-pawl system has been around for a while, and it works.

Wheel Bearing HubAssembly Front

The original equipment bearings on your vehicle are engineered for specific loads. Those bigger and wider tires look cool, as do tires with lower tread walls. But they place higher loads on the wheel bearings, possibly resulting in accelerated wear. That could present a safety issue if your wheel bearings fail.

Wheel hubassembly diagram

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Today’s tech-tastic article covers the standard service procedure for common 2013 Mavic rear hubs. The wheel I’m working with is a CXR 60 clincher, but the same process applies to other wheels such as the CXR 80, R-Sys, Ksyrium Elite/SLR/SLS, Comete rear disc, and Cosmic Carbone 80/SLE.

The next step isn’t necessary for this service, but I figured it wouldn’t hurt to show you. To remove the non-drive side parts, first remove the knurled axle end cap:

“The good news is most of the time, a vehicle will let you know way before a failure ever happens,” said Gary Hardesty, Kelley Blue Book’s in-house service and maintenance expert and an A.S.E. certified master technician. “The key is to listen to your car. Most times, a failing wheel bearing will exhibit a growling type of noise that changes with vehicle speed. The faster the car (goes), the faster the frequency of the growl.”

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Wheel bearings connect a car’s wheels to the axles. They allow wheels to turn with minimal friction. Though wheel bearings are low-maintenance parts, they are important safety components of a vehicle’s braking, steering, and suspension systems. The one-piece hub assembly, between the drive axle and the brake disc or drums, incorporates the hub, wheel bearings, ABS (anti-lock braking system) wheel speed sensor, and mounting flange.

Most vehicles today use sealed hub bearing assemblies that contain roller bearings. While we don’t address these, older cars used tapered roller bearings, which required servicing and preload adjusting to ensure the right amount of end play or axial clearance.

Now remove the two pawls and springs. Don’t lose the springs! They’re tiny and not permanently attached to the pawls. This is one area where it pays dividends to be careful and have a clean work space (e.g. in case you drop one of these).

The bearings are tightly packed in a grease-filled, waterproof, sealed metal ring. This housing, called a race, is located inside the hub, and each wheel has one. Wheel bearings have a Herculean responsibility: They are engineered to support the vehicle’s entire weight.

If you haven’t already done it, the first step is to remove the cassette and rear skewer. Next, use a 5mm allen key in the right side (drive side) of the axle, and a 17mm wrench on the nut. Turn the 17mm nut counterclockwise.

The last step is to grab the freehub and spin the wheel really fast, because it’s fun and will make you feel good about taking care of your equipment.

Driving with bad wheel bearings impacts the safety of a vehicle, and it could cause a serious car accident. We do not advise driving on them when they fail and recommend getting them checked out as soon as possible. Bad wheel bearings can damage things like your hub, the vehicle’s constant velocity joint (CV joint), or the automatic transmission.

As you can see, the freehub contains a bearing inside, and uses a large bushing on the inboard side (the large white part).

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Here’s everything we’ve removed by now, shown in the rough orientation it would sit inside of the hub. Note that the axle is actually flipped backwards in this picture (I only realized it after the hub was reassembled and shipped back to Mavic).

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In this story, we’ll tell you quick facts to know, such as what causes a bad wheel bearing, how long you can drive on one, and the estimated replacement cost of a wheel bearing as you maintain your vehicle.

Bad wheel bearings can cause the steering wheel to vibrate. The intensity increases as the vehicle speed increases and the vehicle turns to the left or right. However, the vibration could be linked to an out-of-round tire (there could be a flat spot on the tire) or a tire that is no longer balanced. Another cause is damaged or worn suspension components.

Your vehicle will signal that it’s time to replace a failed wheel bearing. For example, if you hear unusual sounds like humming or clicking, then your bearing might be bad. Watch out and listen for these signs and symptoms:

The basic purpose of the service we just did is to check the bearings and ensure that the drive mechanism is clean and functional. Also, because this hub has a bushing on the freehub (instead of another bearing), the rolling performance of the hub is also tied to how clean it is. Rather than needing to replace another bearing, all you have to do is wipe off the bushing and apply a little bit of oil. If you’re chasing every last watt but haven’t done this service to your Mavic hub, it’s time to get your hands dirty.

Also, according to Mavic’s Zack Vestal, the newer large inner diameter freehub bodes come with a shim so they retrofit to older-style small axles.

Hub and wheel bearingreplacement

Now it’s time for the only tricky part of the process – pawl reinstallation. As you can see, there is only one way they can go in:

NOTE: There is a specific orientation of this rubber ring. The thick/flat side faces the hub, and the angled side faces outward:

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Hardesty cautions that if you think something is wrong, don’t wait to get it diagnosed: “The longer you wait, the more it will cost as other components may be damaged by a wheel bearing.”

However, luxury cars are more expensive to repair. Do note that if bearings go bad at one wheel, replacing the bearings at the other wheel on the same axle is unnecessary. Don’t let someone talk you into work that is not needed. Get the price estimate for wheel bearing replacement for your make and model of car.

Editor’s Note: This article has been updated for accuracy since it was originally published. Rick Kranz contributed to this report.

Overall, I like this design. On many rear hubs, the most common bearing failure is in the freehub. After all, that’s where the cassette lives, and is generally the biggest recipient of grime on the whole bike. Mavic says that it is possible to replace the bearing inside of the freehub, but that some consumers will just replace the whole unit. In my opinion, the latter is a better choice for the home mechanic that is dealing with a single bad bearing (e.g. the hubshell bearings are still smooth, but the freehub bearing got contaminated).

The most easily identifiable and common symptom of bad wheel bearings is audible. But it can be confusing. For example, the source of a humming noise can be linked to other issues, such as tires and the CV joint.

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Frontwheel bearing hubAssembly replacement cost

If you hear a clicking sound that increases in frequency as the vehicle accelerates, there could be a problem with the wheel hub assembly.

If there is excessive play in the steering, meaning the steering seems less responsive or less precise than normal, worn bearings could be causing the problem. Also, this could be a sign the vehicle needs a wheel alignment. If you have any of the signs listed above, visit a dealer service or auto repair shop.

Mavic’s recommended lubricant is 10w mineral oil. I didn’t have any on-hand, so I decided to use Dumonde Tech Freehub Oil. We reviewed their entire line of lubricants (linked at the bottom of this page), and Vestal noted that he’s used it with success on their hubs.

On average, the cost for a Cadillac CTS Wheel Hub Assembly Replacement is $105 with $10 for parts and $95 for labor. Prices may vary depending on your location.

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The anti-lock warning light may illuminate if the ring, tire, and wheel wobble, the wheel’s speed sensor is no longer operating properly, and the ABS may operate sporadically or not at all. See a professional for repair.

Carefully put the pawls in their place and apply some lubricant. I do one drop underneath on the spring, and one healthy drop on top.

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Technicians can check for wheel wobble by putting the vehicle on a lift and manually checking for wheel movement. Typically, it would be impossible to shake the wheel and tire. However, if it moves, the hub assembly needs immediate attention. The tire and wheel can literally come off the vehicle at any time, at any speed, if you don’t repair your vehicle.

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Next, reinstall the drive side nut with your 5mm allen key and 17mm wrench. My official torque spec is somewhere between ‘snug’ and ‘tight’. Tight is tight, but too tight is… broken.

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The typical sounds of worn-out wheel bearings are squealing and/or growling. The sound intensifies as vehicle speed increases. Try to pinpoint the location of the noise because it will identify the location of the worn-out bearings.

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The cost to replace one front-wheel hub assembly varies widely. Among the variables are the vehicle brand and model, the garage’s labor rate, and the cost of parts. The average out-the-door wheel bearing replacement cost without taxes is about $350 per wheel.

Just to put a rough number to it, I recommend doing the basic service about once per year if you only use the wheel for racing. If you’re training full-time on the wheel, about every 6 months should do it. Full bearing replacement really depends on the rider, conditions, and mileage. Because it requires special tools, you’re likely best off having an authorized Mavic dealer do the service.