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Shimano UN55 Bottom Bracket

Item #: BB257F01
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USD$19.99 20% off USD$24.99 msrp
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Shimano UN55 Bottom Bracket

High quality Shimano sealed bottom bracket (square taper). Extra strong Aluminum (not plastic) non drive cup. Please choose width and spindle length.

  • English Threaded
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REVIEW SNAPSHOT®

by PowerReviews
Shimano UN55 Bottom Bracket
 
4.6

(based on 29 reviews)

Ratings Distribution

  • 5 Stars

     

    (20)

  • 4 Stars

     

    (7)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

97%

of respondents would recommend this to a friend.

Pros

  • Easy to install (22)
  • Durable (14)
  • Enhances pedaling efficiency (8)
  • Lightweight (5)

Cons

    Best Uses

    • Mountain biking (12)
    • Road biking (12)
      • Reviewer Profile:
      • Avid cyclist (11), Casual/ recreational (7), Commuter (5)
      • Was this a gift?:
      • No (23)

    Most Liked Positive Review

     

    5 star rating

    Bought this BB and so far it is a winner. Very smooth and more importantly, very strong. I put a lot of downward force on my pedals and this BB is stiff and...Read complete review

    Bought this BB and so far it is a winner. Very smooth and more importantly, very strong. I put a lot of downward force on my pedals and this BB is stiff and strong. All my power goes to the wheels.

    VS

    Most Liked Negative Review

     

    Minor problem: loose cap

    I've bought 3 of these UN55 units, and on two of them the aluminum cap appears to be loose on the cartridge, by about .020". I made a plastic spacer to...Read complete review

    I've bought 3 of these UN55 units, and on two of them the aluminum cap appears to be loose on the cartridge, by about .020". I made a plastic spacer to take up the play. On the third unit, the cap seems to fit neatly. Possibly these were packed with the wrong cap?

    Reviewed by 29 customers

    Sort by

    Displaying reviews 1-10

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    4.0

    Execellent Easy to Install

    By Dean

    from Moberly, MO

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Easy To Install

    Cons

      Best Uses

        Comments about Shimano UN55 Bottom Bracket:

        I used this to replace the cheap factory FSA that was a heavy steal consturciton, yet quickly (under 500 miles) developed a grating sound while cranking hard up hills. Though I am a heavier rider at 210lbs and am riding a low end bike that's just one step up from buying one off the shelf at Walmart. Installation was easy, only had to do a minor adjustment on the high and low stops of the front derailer as the offset was slightly different on the drivetrain side from the FSA bracket. Pedalling feels smoother after around 200 miles on the new bottom bracket than it ever did on this bike before. Happy so far with this product.

        • Was this a gift?:
        • No

        (1 of 1 customers found this review helpful)

         
        4.0

        Good fix to worn cup and spindle bb

        By Gr1m

        from Cape Cod ,MA

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Easy To Install
        • Enhances Pedaling Efficiency

        Cons

          Best Uses

          • Road Biking

          Comments about Shimano UN55 Bottom Bracket:

          I've used this bottom bracket a couple times to replace pitted and rusted spindles. Very easy installation and reliable. Although, I do like my RaceFace external bearing bb a little better.

          • Was this a gift?:
          • No

          (1 of 1 customers found this review helpful)

           
          5.0

          Easy to replace bottom bracket

          By Gregg

          from Olathe, KS

          About Me Commuter

          Verified Reviewer

          Pros

          • Easy To Install
          • Enhances Pedaling Efficiency

          Cons

            Best Uses

            • Road Biking

            Comments about Shimano UN55 Bottom Bracket:

            I was glad to be able to replace the bottom bracket on my own. Easy instructions.

            • Was this a gift?:
            • No

            (1 of 1 customers found this review helpful)

             
            5.0

            So good, I had to buy another one.

            By Skidmark

            from Kingman, Az.

            About Me Casual/ Recreational

            Verified Reviewer

            Pros

            • Durable
            • Easy To Install
            • Enhances Pedaling Efficiency

            Cons

            • None

            Best Uses

            • Mountain Biking

            Comments about Shimano UN55 Bottom Bracket:

            I had bought one of these for my road bike, and had such good luck with it, when my Kona Lanai started clunking, I got one for it. I didn't realize how bad my bottom bracket was, until I changed it. Wow, what a difference it made, the bike rides so much better now.

            • Was this a gift?:
            • No
             
            5.0

            Good replacement Bottom Bracket

            By Skidmark

            from Kingman, Az.

            About Me Casual/ Recreational

            Verified Reviewer

            Pros

            • Durable
            • Easy To Install
            • Enhances Pedaling Efficiency

            Cons

            • None

            Best Uses

            • Road Biking

            Comments about Shimano UN55 Bottom Bracket:

            I bought this for my cheapy road bike, when the factory BB started getting loose. It was easy to install, and is very smooth and solid. It made a huge difference in how my bike rides now.

            • Was this a gift?:
            • No
             
            5.0

            Seems like a great BB

            By Ken

            from Ann Arbor

            About Me Avid Cyclist

            Verified Buyer

            Pros

            • Easy To Install

            Cons

              Best Uses

              • Mountain Biking

              Comments about Shimano UN55 Bottom Bracket:

              Bought this to replace the old UN25 that was squealing like a stuck pig on my 2004 Trek. Getting the old one off was a bear, but this was a breeze to put on. So far, I've only put 20 miles of mountain biking on it, but the trails I took it on were pretty intense and it handled everything flawlessy. It spins smoother than the old one, that's for sure. Plus, I like the aluminum non-drive cup over the plastic one. Just a personal preference.

              • Was this a gift?:
              • No
               
              4.0

              Much better

              By Rick

              from Wi

              About Me Avid Cyclist

              Verified Buyer

              Pros

              • Easy To Install
              • Enhances Pedaling Efficiency

              Cons

                Best Uses

                • Mountain Biking
                • Road Biking

                Comments about Shimano UN55 Bottom Bracket:

                I put this bottom bracket in my old road bike with ease. For the money it is an easy fix for older bikes.

                • Was this a gift?:
                • No
                 
                5.0

                Shimano UN55, always good

                By SweetGary

                from Central Valley, California

                About Me Avid Cyclist

                Verified Buyer

                Pros

                • Durable
                • Easy To Install
                • Lightweight
                • Saves Money
                • Saves Time

                Cons

                  Best Uses

                  • Road Biking
                  • Vintage Bikes

                  Comments about Shimano UN55 Bottom Bracket:

                  Shimano makes a varity if cartridge bottom brackets. I've used about 10 different sizes and thred configurations. All are good and allow you to save lots of time and money redoing that vintage frameset you have. I've revitalized several classic steel framets with these bottom brackets. Only negative thing, there could be more lengths. But you can shim the drive side some to make up some length. Good stuff.

                  • Was this a gift?:
                  • No
                   
                  5.0

                  Works perfect!

                  By JT

                  from IL

                  About Me Casual/ Recreational

                  Verified Buyer

                  Pros

                  • Durable
                  • Easy To Install

                  Cons

                    Best Uses

                    • Mountain Biking
                    • Road Biking

                    Comments about Shimano UN55 Bottom Bracket:

                    Purchased this to rebuild a 1995 KHS mountain bike I've had since high school. Install was very straightforward with the use of a bottom bracket tool Bike now pedals like new.

                    • Was this a gift?:
                    • No
                     
                    5.0

                    Great product, replaces vintage BB's.

                    By SweetGary

                    from Central Valley, California

                    About Me Avid Cyclist

                    Verified Buyer

                    Pros

                    • Durable
                    • Easy To Install

                    Cons

                    • Not Enough Sizeslengths

                    Best Uses

                    • Road Biking

                    Comments about Shimano UN55 Bottom Bracket:

                    Replace that worn out original BB with one of these easy to install and use Shimano BB's. Many sizes to choose from, even Italian threaded. These are concentric, so remember to add extra when measuring for the drive side of your crankset. The late, great Sheldon Brown covers this in his writings.

                    • Was this a gift?:
                    • No

                    Displaying reviews 1-10

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                    Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.