The cage and rollers are held together inside a hardened metal ring called a “race.” The seal keeps grease in and damaging water and debris out. Wheel bearings are installed inside, and secured to, the suspension, either by press-fit, bolts or a snap-ring. Once mounted, the wheel bearing rides on the axle shaft, allowing the tire/wheel to spin effortlessly.

In my 50 years in the auto repair industry, I can’t recall one good story about wheel bearings. Most involve some sort of brake system failure, tires exploding, or fire from a seized red-hot bearing igniting axle grease. Bad wheel bearings should not be ignored.

SKFbearing life Calculatoronline

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Example: A 100lb fan running at 1200RPM requires a 40,000 hour life. The Cr/P factor is 14.2. Multiplying that factor by the weight of the fan (14.2×100) will provide you the minimum required capacity of the bearing, in this case 1,402lbs. A bearing with a capacity larger than this will provide you with the 40,000 hours required.

Bearing life calculatorpdf

Older rear-wheel-drive cars or trailers use a set of two tapered roller bearings that face each other. These should be routinely serviced every 20,000 miles, or once a year.

Ballbearing life calculator

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Wheel bearings allow cars and trucks to run smoother and more efficiently by reducing friction and supporting vehicle weight.

The average cost of replacing a wheel bearing is £175, with prices ranging from £120 and £300. The cost will vary depending on whether the front or rear or if ...

Bearing life calculatormetric

By running through these calculations and tables you’re providing yourself with both the amount of hours you can expect your bearing to run and also how safely under the allowable radial load your application is.

If you need to know what the bearing capacity needs to be for your application and have the imposed radial load, RPM, and an idea of how long the bearing needs to last, the table below can provide you with that answer. A simplified L10 life chart is found below, but neither includes every viable application or L10 life.

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L10bearing life calculator

Driving on a bad or failing wheel bearing is dangerous. If ignored, it can quickly turn into a safety issue and an expensive repair.

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NOTE: Whether you DIY or your mechanic replaces the bearing, always install a new axle hub nut. Most hub nuts are prevailing torque fasteners. They’re used on critical components, like securing axle shafts to hub bearings, where a loose nut could lead to disastrous consequences.

Keep in mind that designed life and actual life will be different. Designed life calculations will never account for all the variables life throws at an application. The L10 calculation assumes ideal operating conditions, and we know those are few and far between. Some studies show that approximately 10% of bearings reach their calculated lifespan, though there are innumerable reasons for this.

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My opinion? If your vehicle has more than 50,000 miles or has been driven in harsh conditions, then it’s logical to replacing wheel bearings on both axles. However, if your vehicle has low mileage and the other bearing is in good condition, replacing only the damaged bearing should not be a problem.

Bearing lifein hours

When selecting a bearing for an application, it is often helpful to know what the expected life will be. The standard industry measurement is L10 bearing life. This is the number of hours at a constant speed that a group of bearings will reach before 10% of bearings fail.

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Never reuse any wheel bearing (sealed or tapered) that’s loose, worn, noisy or shows any signs of wear. Trying to fix a loose or damaged wheel bearing can result in an accident and severe injury. Even if a pro suggests repairing a bearing, don’t let them.

Bearing life calculatorexcel

However, on some vehicles, it can be less than $100 per wheel. And you can save hundreds in labor if you DIY. If you don’t have the tools, most auto parts stores will lend you the specialty tools and equipment needed.

Bearing life calculatorapp

The formula and table below will provide a few critical pieces of information for your bearing application. It will provide you with the required capacity of the bearing and the maximum radial load you can impose.

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I’ve replaced hundreds, if not thousands, of wheel bearings. One thing I’ve learned: A bad wheel bearing always gives an indication it’s failing. These include:

If you know your bearing’s dynamic capacity, imposed radial load, and RPM, you can calculate your own L10 bearing life. This gives you an idea as to how long you can expect your bearing to run.

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Under normal driving conditions, wheel bearings should last 85,000 to 100,000 miles. They can fail for several reasons, including:

The average cost to replace a sealed wheel hub bearing is around $350 per wheel. However, depending on the make and model, the shop labor rate ($47 to $215 per hour, according to AAA) and any additional damage could push the cost beyond $1,000 per wheel.

On modern front- and four-wheel-drive cars, wheel bearings are a set of permanently sealed, precisely machined steel ball or straight roller bearings. The balls or rollers are encased in a “cage” that supports the bearings, allowing them to rotate freely.