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Shimano UN55 Bottom Bracket

Item #: BB257F01
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From USD$14.99 40% off USD$24.99 msrp
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Customers Also Bought

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

REVIEW SNAPSHOT®

by PowerReviews
Shimano UN55 Bottom Bracket
 
4.6

(based on 20 reviews)

Ratings Distribution

  • 5 Stars

     

    (14)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

95%

of respondents would recommend this to a friend.

Pros

  • Easy to install (13)
  • Durable (10)
  • Lightweight (4)
  • Enhances pedaling efficiency (3)

Cons

    Best Uses

    • Mountain biking (8)
    • Road biking (6)
      • Reviewer Profile:
      • Avid cyclist (7), Commuter (4), Casual/ recreational (3)
      • Was this a gift?:
      • No (14)

    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 20 customers

    Sort by

    Displaying reviews 1-10

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    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
         
        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
                   
                  4.0

                  Smooth upgrade

                  By Leon m

                  from Pasadena, CA

                  About Me Commuter

                  Verified Buyer

                  Pros

                  • Durable
                  • Easy To Install

                  Cons

                    Best Uses

                    • Casual Riding
                    • Mountain Biking
                    • Road Biking
                    • Upgrade

                    Comments about Shimano UN55 Bottom Bracket:

                    Replaced my clunking bottom bracket on my trek 7.3 after 6300 miles. This one is at least the same quality, probably better. Easy to replace with right tools. Should live a long life. Very smooth.

                    • Was this a gift?:
                    • No
                     
                    3.0

                    Minor problem: loose cap

                    By Ben

                    from Pittsburgh

                    About Me Commuter

                    Verified Buyer

                    Pros

                    • Attractive Design
                    • Durable
                    • Easy To Install
                    • Lightweight

                    Cons

                      Best Uses

                      • Mountain Biking

                      Comments about Shimano UN55 Bottom Bracket:

                      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?

                      • Was this a gift?:
                      • No
                       
                      5.0

                      works fine.

                      By dmk

                      from tx

                      About Me Avid Cyclist

                      Verified Buyer

                      Pros

                      • Easy To Install

                      Cons

                      • Req Special Instal Tools

                      Best Uses

                      • Road Biking

                      Comments about Shimano UN55 Bottom Bracket:

                      Never had a problem with the old bracket until it wore out after 8 years of riding. This is a replacement and it works as it should. Make sure you get the right length bottom bracket when replacing the worn out unit. Also pay attention to direction things are threaded. It's not the same on both sides.

                      • 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.