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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 32 reviews)

Ratings Distribution

  • 5 Stars

     

    (21)

  • 4 Stars

     

    (9)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

97%

of respondents would recommend this to a friend.

Pros

  • Easy to install (25)
  • Durable (14)
  • Enhances pedaling efficiency (11)
  • Lightweight (5)

Cons

    Best Uses

    • Mountain biking (13)
    • Road biking (13)
      • Reviewer Profile:
      • Avid cyclist (13), Casual/ recreational (7), Commuter (6)
      • Was this a gift?:
      • No (26)

    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 32 customers

    Sort by

    Displaying reviews 1-10

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    5.0

    Great upgrade for 1999 Trek 6500 MTB

    By ek

    from Ahia

    About Me Commuter

    Verified Buyer

    Pros

    • Aluminum Cup
    • Easy To Install
    • Enhances Pedaling Efficiency

    Cons

      Best Uses

      • Mountain Biking

      Comments about Shimano UN55 Bottom Bracket:

      With my limited bike knowledge, took some time scratching around to determine the UN55 was correct replacement.

      • Was this a gift?:
      • No
       
      4.0

      Solid part, very smooth!

      By Frazinator

      from Guelph Ontario

      About Me Avid Cyclist

      Verified Reviewer

      Pros

      • Easy To Install
      • Enhances Pedaling Efficiency

      Cons

        Best Uses

        • Road Biking

        Comments about Shimano UN55 Bottom Bracket:

        This is an awesome bottom bracket for fixed gear bicycles, I bought it to go with a pure-fix crank and they work well together (ie. Square taper). The only thing I would say negative about it, which applies mainly to track/fixed bikes. I had a friend who's chain snapped and in that process (including a bail) the bottom bracket bent a tiny amount, but was barely enough to notice while riding.

        • Was this a gift?:
        • No
         
        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

                        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.