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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 24 reviews)

Ratings Distribution

  • 5 Stars

     

    (17)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

96%

of respondents would recommend this to a friend.

Pros

  • Easy to install (17)
  • Durable (12)
  • Lightweight (5)
  • Enhances pedaling efficiency (4)

Cons

    Best Uses

    • Mountain biking (11)
    • Road biking (9)
      • Reviewer Profile:
      • Avid cyclist (10), Casual/ recreational (4), Commuter (4)
      • Was this a gift?:
      • No (18)

    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 24 customers

    Sort by

    Displaying reviews 1-10

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    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
             
            5.0

            Meets my expectations

            By Scott L

            from Kingston MA.

            About Me Casual/ Recreational

            Verified Buyer

            Pros

            • Durable
            • Easy To Install
            • Enhances Pedaling Efficiency
            • Lightweight

            Cons

              Best Uses

              • Mountain Biking

              Comments about Shimano UN55 Bottom Bracket:

              I replaced a Shimano BB-LP27 that had 450+ miles on it. This UN55 was a perfect upgrade and perfect fit. Just be carful when trying to thread the aluminum cup. The threads are very fine, it will test you patience. The correct tools for the job are a must. I also purchased them for a great price from Jenson.

              • Was this a gift?:
              • No
               
              5.0

              K.I.S.S. Bang for the buck

              By Fritz

              from Vestal, ny

              About Me Avid Cyclist

              Verified Buyer

              Pros

              • Durable
              • Easy To Install

              Cons

                Best Uses

                • Mountain Biking
                • Road Biking

                Comments about Shimano UN55 Bottom Bracket:

                I use this bb on a cross build to get proper chainline after removing holotech bb going from double to triple.

                • Was this a gift?:
                • No

                (2 of 2 customers found this review helpful)

                 
                4.0

                The Classic "55" - affordable fit

                By Truji

                from 10kLakes

                About Me Commuter

                Verified Buyer

                Pros

                • Durable
                • Easy To Install
                • Enhances Pedaling Efficiency
                • Lightweight

                Cons

                  Best Uses

                    Comments about Shimano UN55 Bottom Bracket:

                    used this bb to revamp an early Fuji Gran Tourer. Despite my wanting to use the adjustable factory bb, the oem spindle was pitted beyond use. Good replacement spindles in the correct width in fairly short supply. This UN55 with it's many spindle lengths was a quick & inexpensive fix to get the Gran Tourer road worthy again.

                    • Was this a gift?:
                    • No
                     
                    5.0

                    Good, all-around bottom bracket

                    By TedB

                    from Columbus, OH

                    About Me Avid Cyclist

                    Verified Buyer

                    Pros

                    • Durable
                    • Easy To Install

                    Cons

                      Best Uses

                      • Mountain Biking
                      • Road Biking

                      Comments about Shimano UN55 Bottom Bracket:

                      Pretty common BB, that will give you years of service. A plus is the aluminum vs plastic cup. Make sure you get the correct width and have the appropriate BB tool to install it.

                      • Was this a gift?:
                      • No
                       
                      5.0

                      Smooth

                      By Firemedic

                      from Nv

                      About Me Casual/ Recreational

                      Verified Buyer

                      Pros

                      • Easy To Install
                      • Enhances Pedaling Efficiency
                      • Lightweight

                      Cons

                        Best Uses

                        • Mountain Biking

                        Comments about Shimano UN55 Bottom Bracket:

                        This thing is smooth...light weight when compared to the stock system...
                        Very easy to install...

                        • 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.