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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 30 reviews)

Ratings Distribution

  • 5 Stars

     

    (20)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

97%

of respondents would recommend this to a friend.

Pros

  • Easy to install (23)
  • Durable (14)
  • Enhances pedaling efficiency (9)
  • Lightweight (5)

Cons

    Best Uses

    • Mountain biking (12)
    • Road biking (12)
      • Reviewer Profile:
      • Avid cyclist (12), Casual/ recreational (7), Commuter (5)
      • Was this a gift?:
      • No (24)

    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 30 customers

    Sort by

    Displaying reviews 1-10

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    4.0

    Good product at good price

    By markw

    from Charleston, SC

    About Me Avid Cyclist

    Verified Buyer

    Pros

    • Easy To Install
    • Enhances Pedaling Efficiency

    Cons

      Best Uses

        Comments about Shimano UN55 Bottom Bracket:

        Bottom bracket on road bike finally wore out, this was easy to install and greatly improved peddling.

        • Was this a gift?:
        • No
         
        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

                        Displaying reviews 1-10

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                        Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

                        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.