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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 23 reviews)

Ratings Distribution

  • 5 Stars

     

    (16)

  • 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 (16)
  • Durable (12)
  • Lightweight (5)
  • Enhances pedaling efficiency (4)

Cons

    Best Uses

    • Mountain biking (10)
    • Road biking (9)
      • Reviewer Profile:
      • Avid cyclist (9), Casual/ recreational (4), Commuter (4)
      • Was this a gift?:
      • No (17)

    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 23 customers

    Sort by

    Displaying reviews 1-10

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    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
                       
                      5.0

                      smooth

                      By newrodie

                      from charlotte

                      About Me Casual/ Recreational

                      Verified Buyer

                      Pros

                      • Easy To Install

                      Cons

                        Best Uses

                        • Road Biking

                        Comments about Shimano UN55 Bottom Bracket:

                        gave new life to the old schwinn.bolts included.

                        • 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.