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Shimano UN55 Bottom Bracket

USD$15.99 32% off USD$23.39 msrp
Item #: BB257F01
USD$15.99 32% off USD$23.39 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 54 reviews)

Ratings Distribution

  • 5 Stars

     

    (38)

  • 4 Stars

     

    (13)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (0)

98%

of respondents would recommend this to a friend.

Pros

  • Easy to install (42)
  • Durable (30)
  • Enhances pedaling efficiency (20)
  • Lightweight (7)

Cons

No Cons

Best Uses

  • Mountain biking (28)
  • Road biking (20)
    • Reviewer Profile:
    • Avid cyclist (23), Casual/ recreational (13), Commuter (11)
    • Was this a gift?:
    • No (48)

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 54 customers

Displaying reviews 1-10

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4.0

Good bang for buck bottom bracket

By Cranky Cogger

from Milwaukee

About Me Avid Cyclist

Verified Buyer

Pros

  • Durable
  • Easy To Install

Cons

    Best Uses

    • Commuting
    • Mountain Biking

    Comments about Shimano UN55 Bottom Bracket:

    For my trusty, old year round commuting bike this bottom bracket is a great buy, especially if you find one on sale. You get Shimano quality, easy replacement and a budget price. Square taper cranks still are out there so I may buy a few more.

    • Was this a gift?:
    • No
     
    5.0

    Great price and fit, solved my creaking popping issues.

    By Usedtobefast

    from Los Altos, CA

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Easy To Install
    • Enhances Pedaling Efficiency

    Cons

      Best Uses

      • Mountain Biking

      Comments about Shimano UN55 Bottom Bracket:

      My Specialized Rockhopper had several crank creaks and pops so I knew it was time for a bottom bracket. Got this one from Jenson and was surprisingly easy to put in. Bike works great now, quiet in the woods. :)

      • Was this a gift?:
      • No
       
      5.0

      Works Just As Expected

      By WillyBoy

      from Ottawa, Ontario, Canada

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Durable
      • Easy To Install

      Cons

        Best Uses

        • Road Biking

        Comments about Shimano UN55 Bottom Bracket:

        This is the 4th one I've purchased for my bikes. I'm very satisfied with the first three

        • Was this a gift?:
        • No
         
        5.0

        Just what I need

        By Carlos

        from Camarillo, Ca

        About Me Commuter

        Verified Buyer

        Pros

        • Durable
        • Easy To Install

        Cons

          Best Uses

          • Mountain Biking

          Comments about Shimano UN55 Bottom Bracket:

          Bottom Bracket fit perfectly to my bicycle and easy to install.

          • Was this a gift?:
          • No
           
          5.0

          shimano quality

          By mark

          from springfield,il

          About Me Commuter

          Verified Buyer

          Pros

          • Durable
          • Enhances Pedaling Efficiency

          Cons

            Best Uses

            • Mountain Biking

            Comments about Shimano UN55 Bottom Bracket:

            works great!

            • Was this a gift?:
            • No

            (0 of 1 customers found this review helpful)

             
            5.0

            Great

            By Deno

            from Hell NYC

            About Me Avid Cyclist

            Verified Buyer

            Pros

            • Durable

            Cons

              Best Uses

              • Mountain Biking

              Comments about Shimano UN55 Bottom Bracket:

              Great

              • Was this a gift?:
              • No

              (0 of 1 customers found this review helpful)

               
              5.0

              it works

              By B.Aldred

              from Southeast Michigan

              About Me Casual/ Recreational

              Verified Buyer

              Pros

              • Durable
              • Easy To Install

              Cons

                Best Uses

                • Mountain Biking

                Comments about Shimano UN55 Bottom Bracket:

                I did my measurements, and it fits correctly. Let's the crank go around and around.

                • Was this a gift?:
                • No
                 
                4.0

                Good product

                By Speedy

                from NE Ohio

                About Me Avid Cyclist

                Verified Buyer

                Pros

                • Better Than Cone And Cup
                • Durable
                • Easy To Install

                Cons

                  Best Uses

                  • Mountain Biking
                  • Road Biking

                  Comments about Shimano UN55 Bottom Bracket:

                  These BB's are great for replacing older cone and cup parts on older bikes. Jenson seems to have a wider range of sizes that most stores at a good price.

                  • Was this a gift?:
                  • No
                   
                  5.0

                  This was just what I needed and works perfectly.

                  By Budster

                  from Key West

                  About Me Competitive Cyclist

                  Verified Buyer

                  Pros

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

                  Cons

                    Best Uses

                      Comments about Shimano UN55 Bottom Bracket:

                      Great to be pedaling solidly again with no noise.

                      • Was this a gift?:
                      • No
                       
                      5.0

                      SmoooooOoooth

                      By BikingMnViking

                      from Twin Cities, MN

                      About Me Avid Cyclist

                      Verified Buyer

                      Pros

                      • Durable
                      • Velvet Bearings

                      Cons

                        Best Uses

                        • Mountain Biking

                        Comments about Shimano UN55 Bottom Bracket:

                        I will have to remember to buy this for my other bikes when their BBs go because this is about as smooth as it gets. Now I did notice that coming out of warm house about 4-5 miles later into the cold I felt my ear tire vibration (nubs) more -- as if the grease thickened up when it cooled. So maybe I work a little harder to spin that crank. It really does not matter to my way of thinking as long as the part is durable (and the price was really good for a sealed bearing with an aluminum adjustable cup)

                        • Was this a gift?:
                        • No

                        Displaying reviews 1-10

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                        Do you have questions about this product?

                        Get answers from real customers and in-house experts with AnswerBox.

                        2 Questions | 2 Answers
                        Displaying questions 1-2
                        • Q:

                          What tool would I need to install this?
                          Asked on 6/26/2016 by Dan from Tracy ca

                          1 answer

                          • Staff Reviewer

                            A:

                            You would need a shimano cartridge bottom bracket tool like this one: TL226B01

                            Answered on 6/27/2016 by Oscar - Merchandisor from Riverside, CA
                        • Q:

                          I have Panasonic bike from 1982 and it is 68mm x 124.7mm do I go down to the 122.5mm or up to the 127mm on the bottom bracket?
                          Asked on 4/12/2016 by Jayhawker from Kansas

                          1 answer

                          • A:

                            Depends on your chainline. If you go down in size, your chainline will move inbound by 1.1mm (124.7-122.5/2). If you go up in size your chainline will move out by 1.15mm (127-124.7/2).

                            Answered on 6/7/2016 by Julz from Knoxville, TN
                        Displaying questions 1-2

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                        Free Shipping Offer

                        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.