Keep pedaling
Free Shipping Over $50*

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.

Shimano UN53 Square Taper BB

Item #: BB407A00
Availability Please make a selection
Quantity   Out of stock.
Shimano Deore LX/STX-RC/STX UN53 bottom brackets are low maintenance, high reliability bottom brackets suitable for a wide variety of applications.
  • English Threaded
  • Chromoly spindle
  • Fits square taper style cranks
  • Crank bolts not included

REVIEW SNAPSHOT®

by PowerReviews
Shimano UN53 Square Taper BB
 
4.4

(based on 8 reviews)

Ratings Distribution

  • 5 Stars

     

    (3)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to install (4)

Cons

No Cons

Best Uses

No Best Uses
    • Was this a gift?:
    • No (4)

Reviewed by 8 customers

Sort by

Displaying reviews 1-8

Back to top

 
4.0

great replacement

By Alex

from Santa Rosa, CA

About Me Casual/ Recreational

Verified Reviewer

Pros

  • Easy To Install
  • Price

Cons

    Best Uses

    • Mountain Biking
    • Replacement

    Comments about Shimano UN53 Square Taper BB:

    This was a replacement BB for my mountain bike. I replaced it when I replaced my crank and front derailleur. I installed it on my own and it wasn't too hard to do. I had some problems getting my front derailleur back in line but now it works like a charm. Just make sure you have the right tools for the job.

    • Was this a gift?:
    • No
     
    5.0

    Great Replacement Crankset for HYBRID

    By Mark T

    from Verona, PA (Pittsburgh area)

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Attractive Design
    • Easy To Install

    Cons

      Best Uses

      • Casual Riding

      Comments about Shimano UN53 Square Taper BB:

      Installed on Trek Verve 3 as a replacement for the stock Suntour NEX, 48/38/28 which wore out after riding 2000 mile this year. I bought this crank because I live just outside of Pittsburgh and it is mostly hills (other than the rails-to-trails bike paths). I wanted the slightly smaller gear rings for the middle and smaller gears. I also have long legs (34" inseam) so I also got the longer cranks arms to give me more torque.

      Installation was very easy. My friend has a a very basic bicycle tool kit and we were able to replace the Crankset without difficulty. I also bought a bottom bracket but did not need to replace it. The stock bottom bracket on the Verve is compatible with the crankset.

      Today I took it out and road up some 4% grades and a am very happy with the performance. With the smaller gears it is much easier to maintain my cadence when climbing and even though the gearing is lower resulting in faster climbing.

      • Was this a gift?:
      • No
       
      5.0

      Get the UN-55 first

      By HoldTheOnions

      from Las Vegas

      About Me Avid Cyclist

      Pros

      • Durable
      • Easy To Install

      Cons

        Best Uses

          Comments about Shimano UN53 Square Taper BB:

          I have the UN-55 right now. If you are concerned about the plastic cup, then spend the extra $12 on the UN-55 to get the metal cup and then you can buy the UN-53 in the future for replacements and just re-use the metal cup. I'm close to 3k miles on the UN-55 and it's still perfectly smooth, so not sure how long it will be before I need a new one, but that's the plan anyway. :)

          • Was this a gift?:
          • No
           
          4.0

          Great price, great choice

          By Stonero

          from México City

          About Me Commuter

          Verified Buyer

          Pros

          • CHEAP
          • Durable
          • Easy To Install

          Cons

          • Heavy

          Best Uses

          • Multi-use

          Comments about Shimano UN53 Square Taper BB:

          Great choice, low price

          • Was this a gift?:
          • No
           
          4.0

          Ordered Friday, received on Monday!

          By Frank the Tank

          from Michigan

          Verified Reviewer

          Pros

          • Fast Shipping
          • Part fits

          Cons

            Best Uses

              Comments about Shimano UN53 Square Taper BB:

              Part fits. No more squeaky when I pedal. Wonderful silence.

               
              4.0

              Could have worked, other problems arose.

              By Stubs

              from Lakewood, WA

              Verified Buyer

              Pros

              • Metal cage
              • Sealed bearings

              Cons

                Best Uses

                  Comments about Shimano UN53 Square Taper BB:

                  As always, make sure you measure properly, but also check the threads to make sure they are clean and sharp. Mine had a casting flaw that caused the BB to skip a thread and it was all downhill from there. Nice product from what I could tell, but not able to use it right now for other reasons.

                  (2 of 2 customers found this review helpful)

                   
                  4.0

                  Great price for durability

                  By Eric

                  from San Bernardino, CA

                  Verified Reviewer

                  Pros

                  • price
                  • Strength

                  Cons

                  • Plastic cup
                  • Weight

                  Best Uses

                    Comments about Shimano UN53 Square Taper BB:

                    Great bottom bracket for the money, despite the plastic non-drive side cup, it is a very durable unit. Its a tad heavier than the un-73 but for the price and longevity, you can't complain.

                    (1 of 1 customers found this review helpful)

                     
                    5.0

                    It's a Bottom bracket

                    By BTphoto

                    from Wpb Fl.

                    Verified Buyer

                    Comments about Shimano UN53 Square Taper BB:

                    shimano durability

                    Displaying reviews 1-8

                    Back to top

                    Jenson USA ships worldwide, including APO/FPO addresses. For a quote, simply add the items you are interested in to your shopping cart and look for the "Shipping Options" box. You don't have to login or create an account to see shipping charges.

                    Some manufacturers restrict where we can ship their products. If this item has shipping restrictions, they are listed below. If you'd like to buy an item that we cannot ship to your preferred address, we can accept your foreign credit card and ship to a USA address for you.

                    Get free shipping with your $50 purchase today when you choose Standard Shipping at 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

                     

                    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.