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  1. Trailer Bearings Races Seals Caps
  2. Bearing Buddy
  3. Caps
  4. Bearing Protector Grease Cap
  5. 1.781 Inch
Bearing Buddy Bearing Protectors - Model 1781 - Chrome Plated (Pair)

Bearing Buddy Bearing Protectors - Model 1781 - Chrome Plated (Pair)

Item # BB1781
Our Price: $34.25
You Save: 14%
Trailer Bearings Races Seals Caps
Shipping Weight: 0.85 lbs
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Bearing Buddy Caps - BB1781
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Provide your trailer wheel bearings with premium protection - replace your existing grease caps with Bearing Buddies. They install in seconds and provide an easy, safe way to monitor and control the level of grease in your axle hub. Great Prices for the best trailer bearings races seals caps from Bearing Buddy. Bearing Buddy Bearing Protectors - Model 1781 - Chrome Plated (Pair) part number BB1781 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (56)
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Bearing Buddy Trailer Bearings Races Seals Caps - BB1781

  • Caps
  • Bearing Protector Grease Cap
  • 1.781 Inch
  • Bearing Buddy

Provide your trailer wheel bearings with premium protection - replace your existing grease caps with Bearing Buddies. They install in seconds and provide an easy, safe way to monitor and control the level of grease in your axle hub.


  • Replaces the grease cap in the axle hub
  • Prevents wheel-bearing failure
    • Keeps water and dirt out of hubs and bearings
    • Allows boat trailer wheels to be completely submerged
    • Stops corrosion and pitting on bearings
  • Provides easily accessible grease fitting
    • Makes adding grease to the bearings quick and simple
  • Maintains slight, controlled pressure (3 psi) with spring-loaded piston, preventing water from entering hub
  • Prevents overfilling and rear seal damage with automatic pressure-relief feature
    • Grease seeps around piston edges and into barrel when full
  • Constructed of stainless steel internal parts and triple-chrome-plated steel barrel
    • Ensures longer-lasting fit than plastic or aluminum products
  • Includes rubber covers
  • Installs easily
  • Made in the USA


  • Fits 1.781" hub bore
    • Works with outer bearing model LM-11949
    • Works with outer bearing cup (race) model LM-11910
  • Lifetime warranty

Bearing Buddy installed diagram

Bearing Buddy Operation

Replace your existing grease cap with a Bearing Buddy to ensure a safe, easy way to monitor and control the level of grease in your axle hub. To adjust the amount of grease in the hub, use a grease gun to add more through the appropriate fitting. Adding grease moves the Bearing Buddy spring-loaded piston outward 1/8".

The O-ring inside the barrel of the Bearing Buddy maintains a seal from the outside. The interior of the Bearing Buddy is pressurized, preventing water from entering the barrel and diluting the grease.

An automatic pressure-relief feature is built into the Bearing Buddy. When the device is full, grease will seep around the edges of the piston and into the barrel. This prevents overfilling that can damage the inner seal.

You can manually check the grease level in your Bearing Buddy by pressing on the edge of the piston. If you can rock or move the piston, the hub is properly filled.

41200 Bearing Buddy Model 1781 - Chrome Plated (Pair)

Customer Satisfaction Score:

Customer Reviews

Bearing Buddy Bearing Protectors - Model 1781 - Chrome Plated (Pair) - BB1781

Average Customer Rating:  4.9 out of 5 stars   (56 Customer Reviews)

Provide your trailer wheel bearings with premium protection - replace your existing grease caps with Bearing Buddies. They install in seconds and provide an easy, safe way to monitor and control the level of grease in your axle hub.


Just installed them on the trailer. These are awesome! I feel much better about taking my boat to the bay with the added security of knowing I'm not going to get saltwater in my bearings.


Fast shipping fit perfectly


These are a must for a boat trailer. I have them on my other boat and they work great. I appreciate your fast service and excellent advise. I will be ordering additional items in the next few weeks.



I used Bearing Buddies on my other boat trailer. I grease them every year with marine grease and nvere had a problem.


Though I have not installed these Bearing Buddies yet, this review is about the excellent customer service I received from eTrailer. My issue was grease flying from my bearings. The folks at eTrailer explained my issue, provided the necessary tool to measure the ID of my hub and directed me to the correct Bearing Buddy for my application. I have been a long-time customer of eTrailer and will continue to be! You can't beat the service and help they provide!


I was trying to sell a boat and trailer, and when I put the buddy bearings on the trailer it was sold in two days, and the people said anyone who puts bearings on an old trailer takes care of his stuff.Thanks for the products. Terry.


Simply fantastic service. Adjusted my order on the fly and made sure it got to me on time, for a hassle free long-distance trip. Thank you Carol!

As for the product -- I went with 1980 SS in the end. Easy to install, load with grease. My trailer's wheels were blissfully silent across an 800 mile round trip.

(Now to return the ones I didn't need...)


The Bearing Buddie worked great. I used it on my boat trailer, installing one on each wheel, easy to regrease after using it. Would definitely recommend it .


If you do not have these on your trailer yet the question would be WHY NOT? An absolute staple for any boat trailer. Keeping your bearings in top shape is number one and this is THE product for it.


These units come with the bra covers included, and they installed easily. I used a block of tropical hard wood to protect it, then I hit it on with a small sledge hammer. This is one of those quick easy jobs you can do that will have long-term implications for the useful life of your trailer. They're of good quality, and I'm proud to have it on my rig. I packed them with a waterproof green grease, because of the climate where I live. Initially I tried to order from Amazon, but they didn't ship to Hawaii, which is plain awful. Thankfully eTrailer shipped ultra-fast and for a reasonable price. Will be returning here from now on for trailer stuff.


I'm extremely pleased with etrailer's service from purchase to delivery. Of course, the product, "Bearing Buddy", speaks for itself, always has been an excellent product. I will buy other items from as the need arises because they are competitive and service oriented.


I wasn't sure if these would fit integral hub rims from the 50's, but sure enough, they did. They fit pretty tight, so I'm not worried about losing them, and they will save the headaches of pulling the bearings every year to re-pack them, as long as the springs have a little compression on them, I know they're good to go.


Great product and company. I found these grease buddies for my outdated boat trailer. Could not find any in my home town. Thanks for coming through.


Excellent service and delivery


Product was as advertised and was a perfect fit. These were use to restore my fathers fishing trailer her bought in 1955 at Sears. The trailer is up an running these days to do pleasure boating in the nearby pond. Thank you.


Received the wrong size first. The customer service was wonderful replaced with the right size and sent shipping label to send wrong ones back it's hard to find good service now days but they did great


Worked perfectly Thanks



Still working great would definitely recommend this product to everyone


Haven't put them on yet,, but was easy to order and receive. If I need anything else I will be e-mailing or calling.


Fit and finish excellent. Rubber caps included a real bonus.


Found just want I needed. I have use them a couple of times and I have always been pleased with the service.


Nice bearing Buddy set, perfect


Everything arrived on time are all parts seem to be there so I think I'm in good shape


Great product. Etrailer is always my first place to shop.


Very quick service. Parts were as expected and worked very well. Thanks!


The buddy bearing I purchased work great. Went right like it was supposed to, and won't have to go through the hassle to return it.


Great product I would order products from etrailer again

Show More Reviews

See what our Experts say about this Bearing Buddy Trailer Bearings Races Seals Caps

  • How Do I Determine Which Bearing Buddy Bearing Protector Will Fit My Aspen Motorcycle Trailer
    The best way to make sure you receive the correct Bearing Buddy bearing protector is to measure the inner diameter of the hub bore (see photo). Unfortunately, the manufacturer of Aspen trailers does not provide much information about their trailers or replacement parts, so I was not able to obtain the OEM grease cap size that Aspen uses. I strongly recommend measuring the hub bore with a precise measuring tool such as a dial caliper because hub bores can vary down to the thousandths of...
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  • Using Bearing Buddy Protectors on 2013 Karavan Single PWC With Waterproof Stamped Dust Cap
    After reviewing the Karavan trailer owner's manual I found the following information: Please note that some Karavan Trailer models are equipped with Knott-AutoFlex Waterproof bearings that require no maintenance. DO NOT remove the metal cap for any reason or damage could result to the bearings. The caps have KNOTT– WATERPROOF stamped in them. It sounds like this is what you are describing with the waterproof stamp. Based on this information, I would not recommend using the # BB1781 Bearing...
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  • Will the Bearing Buddy Bearing Protectors Damage the Spindle if Overfilled
    In regards to the Bearing Buddy Bearing Protectors like part # BB1781, they do indeed have built-in pressure relief so if you overfill them, they will expel the excess grease which prevents damage. The worst thing that could happen if you overfill them would be blowing out the grease seal. I am not aware of any other damage that could occur but I also cannot recommend going against the manufactures recommendations. I have attached our full list of bearing protections below as well.
    view full answer...
  • How to Pick out Bearing Buddies
    In order to pick out the correct bearing buddy you will need know the pilot hole of your hub. To do this, remove the wheel and tire and remove the grease cap from the center of the hub. Usually it is a metal cap that is just lightly hammered into place. Use a screwdriver to pry off the cap. Clean the grease off and measure the opening. I have included a video demonstrating the Bearing Buddy. The Bearing Buddies # BB1980A-SS that you referenced are for hubs with a 1.980 inch hub bore.
    view full answer...
  • Are Bearing Buddies Measured in Inches
    I am not sure what you mean. Bearing Buddies are measured in inches. For example # BB1781 is 1.781 inches. Measurements have to be as accurate as possible so when measuring the opening on a hub for bearing protectors use dial or digital calipers, not a tape measure. I also might be able to figure out the size you need based on the outer bearing number stamped into the side of the bearing.
    view full answer...
  • How to Determine Correct Bearing Buddy for 1991 Lil Rider Boat Trailer
    You can determine the correct Bearing Buddy for your 1991 Lil Rider boat trailer by checking the part numbers on the existing outer bearing and race. I have attached a photo showing where these parts numbers are typically found. Trailer manufacturers do not necessarily use the same components on all production runs so a check of your existing parts is called for. You can search our site with the bearing number to find the appropriate Bearing Buddy. An alternative method for identifying...
    view full answer...
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  • How to Measure for Correct Buddy Bearing Fit
    To get you the correct Bearing Buddy grease caps you will need more information. The info on the trailer sticker even if it wasn't so faded would not have helped. You will need to simply pull one of your grease caps and use a digital caliper to get a precise measurement of the inner diameter of your hub. Once you have that measurement you can then determine the correct Bearing Buddy grease cap. I've linked the page to all of your options to assist. The precise fit is important because...
    view full answer...
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  • Determining Bearing Buddy Size For Folding Trailer
    The best way to find the correct Bearing Buddy for your folding trailer is by checking the numbers on the outer bearing. I have attached a photo that shows where the numbers can typically be found. You can use those numbers to find the correct Bearing buddy that will work for you. Another way to find the correct Bearing Buddy is by measuring the hub bore. You will need a caliper to get an accurate measurement. After getting the measurement you can choose the Bearing Buddy that fits. I...
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  • Can Bearing Buddy Bearing Protectors Be Over-Filled with Too Much Grease
    It is possible to over-fill a hub that has a Bearing Buddy bearing protector such as # BB1781. The convenience of easy filling through the zerk fitting can often mean we can be tempted to keep adding more grease. ("If a little is good, then more is better"). What usually happens is that the rear grease seal gets blown out from the excess grease/pressure and so I suggest you inspect your grease seals to make sure they are still intact and without excess grease having been pushed out past...
    view full answer...
  • Bearing Buddies For A 2004 Forest River Rockwood Travel Trailer
    Before installing The Bearing Buddy Bearing Protectors # BB1781 I would recommend inspecting the bearings and clean or repack them if need be before you install the bearing protectors. The protectors have a spring loaded seal that keeps moisture and debris out of the bearings. The pressurized grease from the bearing buddy will maintain bearing function as long as the seal on the hub stays functional. When filling the Bearing Buddy # BB1781 with grease you need to fill them up into grease...
    view full answer...
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  • How To Determine The Correct Bearing Buddy Dust Cover For A 2021 Shoreland'r Boat Trailer
    To figure out what Bearing Buddy you need for your 2021 Shoreland'r boat trailer you'll need to measure the diameter of your hub's bore hole (pictured below). Once you have that measure we can find the correct fitting Bearing Buddy. For example, the Bearing Buddy Bearing Protectors # BB1781 you were looking at is a fit for a 1.781" hub bore hole diameter.
    view full answer...
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  • How To Tell What Size Bearing Buddy Is Needed for My Trailer Hubs
    The portion you need to measure is not the cap, but the the hub bore. Remove the grease caps and measure the diameter of the opening the caps occupy. This is the hub bore. You will need an accurate measuring devices like a set of dial calipers that is accurate to 3 decimal places. The Bearing Buddy pair you were looking at, part # BB1781, fits a 1.781 inch hub bore. The measurement you find should match exactly or very close to one of the measurements displayed on the Bearing Buddy page...
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  • Can Trailer with EZ Lube Spindles Have Bearing Buddy Installed
    Sorry about any confusion! A Bearing Buddy can install on a EZ lube hub/spindle but you are going to have to take the zerk fitting off of the spindle to allow the Bearing Buddy to fit and have the needed clearance. You can yank it off with a pair of pliers or vice grips. If they are threaded (should see a hex pattern around outside of fitting) you could also use a small wrench to take the fitting out. Aside from the zerk fitting on the spindles of the EZ lube spindles there's no difference...
    view full answer...
  • How to Pick Out Replacement Hubs for Mobile Home Axles
    You would have to contact your local DOT to find out if the tires/wheels/hubs you have are street legal in your area. Typically mobile home axles are set up for one time use so relying on them for any length of time might not be the best idea. You can also try contacting HADCO directly to see if they recommend your specific hub for highway use. You may find that you need to replace your hubs. In order to pick out the correct hub assembly for a trailer you are going to need know a few key...
    view full answer...
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  • How Does a Bearing Buddy Get Installed and Removed
    Installing Bearing Buddies like # BB1781 is fairly straight forward. I have included a link to a video and if you fast forward to about the 5:20 minute mark, our installer puts one on. He lines it up first and gives it a tap to get started. Then he places a block of wood over the end of the Bearing Buddy. The block of wood disperses the force of the hammer used to tap it into place. To remove a Bearing Buddy I would use a rubber mallet and gently tap it on the sides to unseat it.
    view full answer...
  • Can Bearing Buddy Be Installed on Trailer Hub If Spindle Has Grease Fitting
    You can use Bearing Buddies on a trailer with EZ lube spindles but you'll have to remove the zerk fitting so that the Bearing Buddy can fit over it. To pick out Bearing Buddies that fit your hub you'll need to measure the diameter of your hub bore where the cap installs and pick out a Bearing Buddy that matches this. For example, the part # BB1781 fits a hub bore that measures 1.781 inches.
    view full answer...
  • Possible Bearing Buddy to Fit Hub Bore Near 1.75 inch
    The closest we have to that size is the Bearing Buddy # BB1781 which is for a hub bore of 1.781 inch. You might remeasure your hub bore to see if this would be the correct size or not.
    view full answer...
  • Where is Grease Fitting of Bearing Buddy for Trailer Hub
    If you check out the diagram I attached for Bearing Buddies like the # BB1781 you can see that the grease fitting is beneath the cap. Basically you attach your grease gun to the fitting and then pump in grease until you see the piston move slightly while turning the hub. It's easy to over fill hubs with these so be careful not to go too crazy with it.
    view full answer...
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  • How to Add Grease to Super Lube Trailer Hub with Rear Grease Zerk Fitting
    The rear side of a Super Lube hub has a grease zerk fitting that works like the one on a Bearing Buddy grease cap such as # BB1781. These zerk fittings let you add wheel bearing grease to the hub interior without having to remove it from the spindle. The claimed advantage of the Super Lube hub is that the rear zerk fitting gives you the same grease fill convenience as a Bearing Buddy but without the risk of blowing out the rear grease seal from the pressure of pumping in too much grease....
    view full answer...
  • How to Determine Which Size Bearing Buddy Protector is Needed on a 1989 Heritage Trailer
    To determine the correct size Bearing Buddy Protector you need on your 1989 Heritage boat trailer you'll need to remove the current caps and measure the diameter of the hub bore that they cover. You'll need to be exact as possible down to the 1000th of an inch. For example, the Bearing Buddy Protector # BB1781 fits a 1.781 inch hub bore.
    view full answer...
  • Do Bearing Buddy Bearing Protectors Still Require Repacking Bearings Every Year or Two?
    With Bearing Buddy caps like # BB1781, you do not need to repack your bearings every year or two. The springs integrated in the caps ensure there is constant pressure to make sure the bearings are always packed with grease appropriately. I just recommend checking the rear seal to ensure there is no leaking as those rear seals can go bad and leak grease without anything noticeable from the front of your hub.
    view full answer...
  • Choosing Correct Bearing Buddy Size for 2001 Coleman Taos Tent Camper
    The particular bearing buddy you reviewed, part # BB1781, fits a hub bore of 1.781 inches and an outer bearing number LM-11949 Trailer and camper manufacturers may use different components in their products from one production run to another, so the only sure way to know what bearings are used in your Coleman Taos camper is to pull the wheel and hub and check the outer bearing number. Please refer to the photo provided. The next best method is to measure the hub bore using a digital caliper....
    view full answer...
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  • How to Measure for Correct Bearing Buddy Size
    You will want to use a digital caliper to measure the inner diameter of the hub bore, where the grease cap sits. When choosing a Bearing Buddy, you will want to choose one that is a few thousandths of an inch larger than the hub bore opening. I have attached a link to all of our Bearing Buddy parts for you.
    view full answer...
  • How To Know When Your Done Filling Item # BB1781 With Grease
    If you start seeing grease coming back out of the Bearing Buddy Item # BB1781 then you should be good to go with filling it. It is not necessary to fill every time you pull out of the water. It would not hurt to check them every couple months though. Marine grease typically holds up well against water.
    view full answer...

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