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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: $24.54
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Trailer Bearings Races Seals Caps
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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 (60)
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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   (60 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.


Everything looks good.


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.


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 .


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!


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.


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.


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.


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


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


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.


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.


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


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.


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.


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


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


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


Worked perfectly Thanks



Still working great would definitely recommend this product to everyone

Show More Reviews

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

  • 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...
  • Bearing Buddy that Fits Hub Bore Around 1.75 inch
    If the hub bore is 1.5 inches like you mentioned (the area of the hub where the cap installs) then we don't have a Bearing Buddy that will fit. If the measurement was more like 1.75 inch then the # BB1781 would most likely fit as it measures 1.78 inches.
    view full answer...
  • Shorelander Wheel Hub Stud Recommendation
    Looks like you have a spline diameter of .56 inches and and threaded portion of 1/2 inch which is very popular. For that you'd want the part # K12WB2. I attached a picture that has a dimensional diagram for you to check out as well.
    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...
  • What Bearing Buddy Bearing Protectors Fit Mobile Home Axle Hubs?
    To determine proper fit, you will need to measure your hubs with a digital caliper like # PTW80157. You will remove the current cap and measure the inside diameter of the hub. So you would use the smaller teeth that face outward on the back of the caliper to measure the width. Make sure the caliper is zeroed out before you start and you'll want the full two numbers after the decimal measuring in inches. Then find that number on the attached link and you will see your options.
    view full answer...
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  • Bearing Buddy That Fits 2.7 Inch Hub Bore
    We do have a Bearing Buddy which fits a similar dimension as the 2-3/4" you referenced but I do recommend using a digital caliper and measuring your hub bore size to the thousandths of an inch to ensure you get the correct fit. For a 2-3/4" hub bore the closest fit we have are Bearing Buddies that fit a 2.717" hub bore, the Bearing Buddy Bearing Protectors - Model 2717SS - Stainless Steel # BB2717SS and the Bearing Buddy Bearing Protectors - Model 2717 - Chrome Plated # BB2717. I have...
    view full answer...
  • How To Tell If Bearing Buddy Has Enough Grease
    The great thing about Bearing Buddy like part # BB1781 is that when you add grease to your system with the included fitting, it will move the spring-loaded piston outward and allow grease to seep around the edges to keep from damaging the seal. You can manually check the Bearing Buddy to be sure it has enough grease. All you need to do is press the edge of the piston. If you can move or rock the piston it has enough grease. I have attached a drawing of a Bearing Buddy you can check out...
    view full answer...
    Image 1 for
  • How To Properly Measure For Bearing Buddy Bearing Protectors?
    Do determine the correct bearing buddy for your 2004 Ranger 521vx you will need to find the hub bore diameter or the outer bearing size. To find the hub bore you will need a Digital Caliper # PTW80157. You will be able to remove the grease cap and measure the hub bore as seen in the picture. If you have a threaded hub bore this is the only way to measure. Another way is if you know what size your outer bearing is on your hub. With the bearing size we can identify the race and use its...
    view full answer...
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  • 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...
  • How To Determine If Trailer Hub Bearing Is Full Of Grease
    If you have EZ lube spindles with the grease fitting on the end, as seen in the video you are referring to for Replacement Trailer Hub Bearing # LM11949, you will just fill until the new grease starts to come out of the spindle. If you don't have spindles with the grease fitting and you are referring to the grease fitting on a Bearing Buddy like Bearing Buddy Bearing Protectors # BB1781, then there is an over-fill protective spring that allows grease to overflow out of the cap when it's...
    view full answer...
  • How to Pick Out Bearing Buddy for Trailer
    Most Bearing Buddies are going to stick out about an 1-1/4 to 2 inches from the hub when installed. But that also depends on which ones you need to go with. We do not carry a longer version. 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...
    view full answer...
  • 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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  • Bearing Buddy Sizes Compatible for Hub 2 Inch Inner Diameter
    There are a couple of sizes close to your 2 inch diameter. If you measured with a digital caliper that goes to the thousandths then that will be much easier to determine the fit. We have the 2.047 inch # BB2047 in chrome plated or # BB2047SS in stainless steel. We also have the 2.080 inch # BB2080 in chrome of # BB2080SS in stainless steel. If it is smaller we have the 1.80 inch # BB1980A-SS in stainless steel. The fit should be snug to prevent leaks so I've attached a video...
    view full answer...
  • Can Bearing Buddy Fit on EZ Lube Spindle that has Zerk Fitting
    Yes you can use a Bearing Buddy on your current axle setup but you'll have to remove the zerk/grease fitting. What you have now is an EZ lube spindle which allows you to push grease through the middle of the spindle but you can install a Bearing Buddy over one of these spindles and it will still work. The trick to picking out the correct Bearing Buddy is to go with the one that fits the bore of the hub you have where the grease cap goes. The part # BB1781 fits hub bore of 1.781 inches. You'd...
    view full answer...
  • Bearing Buddy for 1.98 and 2.13 Inch Trailer Hub Center Hole
    First I would get the hubs matched up because if they are different sizes that can lead to uneven wear of the tires and suspension components. Not to mention you would have to buy two sets of replacement parts all the time. But if the 2 hubs are on two different axles, that makes more sense. We have a lot of options for the 1.98 size. I have included a link to them on the right. For just a regular set use # BB1980A. The 2.13 is more difficult because it is in between sizes. If you can...
    view full answer...
  • Replacement Bras For Bearing Buddy Bearing Protectors
    The grease cap plugs we offer like part # DC-RP are designed for a specific size which fits a 1.18 inch opening. This is designed for the E-Z Lube grease caps. I have attached a link to our product page that has the available replacement bras for the Bearing Buddy you can check out. These may work for you but there is no guarantee. For example, if you have part # BB1781, # BB1781SS, or # BB1810, the replacement bra you need is part # BB17B.
    view full answer...
  • Comparing Buddy Bearings and EZ-Lube Grease Caps
    The Bearing Buddy Bearing Protectors like part # BB1781 will only work for standard spindles, not those with grease fittings in the end which are also known as EZ-Lube. They both are designed to provide easy lubrication to the bearings without having to pull apart the hub. If you have EZ-Lube hubs you'll have to use grease caps, preferably ones that have an easy to remove center section like the Grease Caps part # RG04-040.
    view full answer...
  • Do Bearing Buddies Pack the Inner Bearing w/ Grease?
    No, you do not! Bearing Buddy Bearing Protectors like item # BB1781 grease both the inner and out bearing so you don't need to worry about taking your hub apart to repack the inner bearings.
    view full answer...
  • Which Bearing Buddies Fit Titan Trailer Hub DX22XR
    Trailer hub # DX22XR uses outer bearing LM11949 so you can use Bearing Buddy Bearing Protectors - Model 1781 - Chrome Plated (Pair) Item # BB1781. Or you can use Bearing Buddy Bearing Protectors - Model 1781SS - Stainless Steel (Pair) Item # BB1781SS for a stainless steel version.
    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 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...
    view full answer...
    Image 1 for
  • 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 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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  • Need Bearing Buddy for 2-1/8 Inch Diameter Trailer Hub Bore
    The closest Bearing Buddy we have to a 2-1/8 measurement is going to be a slightly larger set that measures 2.240 inches, # BB2240 or # BB2240SS. In order to determine the correct Bearing Buddy for your trailer, the best way is to get the inner and outer bearing numbers on the bearings and/or the number on the outer cup (race). The Bearing Buddy part numbers listed above fit 1700 series outer bearings with race model 1729.
    view full answer...

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Info for this part was:

Employee Jackie C
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Jackie C
Employee Mike L
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Mike L
Employee Patrick B
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Patrick B
Employee Michael H
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Employee Jeffrey L
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Employee Tyler C
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Employee Cole B
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Cole B
Employee Chris R
Video Edited:
Chris R

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