(888) 880-3811 (888) 880-3811
Show Prices In:

Shimano UN-73 Bottom Bracket

Item #: BB708A01
Buy Now
Availability Please make a selection
Quantity   Out of stock.
close

Tell a friend! We'll send your friends the page and your message.
Note: You and your friend's email addresses are only used once as a referral. We will not collect or store the email addresses.

Friend's Name:
Your Name:
Friend's Email:
Your Email:
Message
(500 char. max)
Notify Me
Receive an email when this product becomes available.

Enter your name and email to be notified when this product is in stock and available to purchase.
First Name:
Last Name:
Email:
A solid, reliable square taper bottom bracket, the UN-73 Still one of the best overall square taper style bottom brackets available, an oldie but goodie.
  • English Threaded
  • Hollow chromoly JIS spindle
  • Fits square taper style cranks
  • Weight: 242 g

REVIEW SNAPSHOT®

by PowerReviews
Shimano UN-73 Bottom Bracket
 
4.2

(based on 20 reviews)

Ratings Distribution

  • 5 Stars

     

    (12)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (2)

88%

of respondents would recommend this to a friend.

Pros

  • Easy to install (3)
  • Price (3)

Cons

    Best Uses

      Most Liked Positive Review

       

      Awesome especially for the price

      I've built and ridden a couple dozen bikes using this BB or one below (like the UN-54 and such) over the years, and i personally can't tell the difference between a really...Read complete review

      I've built and ridden a couple dozen bikes using this BB or one below (like the UN-54 and such) over the years, and i personally can't tell the difference between a really high end vs. a low end square taper BB other than the weight. So many of the external/integrated BB types really blow the square taper + ST crankset combos out of the water when it comes to weight and stiffness... so when you go square taper i figure you're on a tighter budget or riding a somewhat unique BB shell or crankset. And in either case, these BB's are great. I haven't done too many thousands of miles on any single UN-73 or the like... but i've done many hundreds on most, and i don't think general users buying these Shimano BB's either reach those kinds of miles, or alternatively don't mind replacing their BB's every 3 to 5 years of real use.
      Them's my two bits.

      VS

      Most Liked Negative Review

       

      Picture of a 68mm/shipped a 73

      The picture of the product in the online catalog is of a un73 68mm. I thought I was ordering a un73 68mm. I was shipped a un73 73mm. It didn't fit. The box...Read complete review

      The picture of the product in the online catalog is of a un73 68mm. I thought I was ordering a un73 68mm. I was shipped a un73 73mm. It didn't fit. The box had been opened and the bracket had been greased for installation. Someone else made the same mistake and returned the item. I didn't bother to return it.

      Reviewed by 20 customers

      Sort by

      Displaying reviews 1-10

      Back to top

      Previous | Next »

      (0 of 2 customers found this review helpful)

       
      1.0

      Picture of a 68mm/shipped a 73

      By Al

      from Madisonville, LA

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Easy To Install

      Cons

      • Easily Mis Specified

      Best Uses

      • Road Biking

      Comments about Shimano UN-73 Bottom Bracket:

      The picture of the product in the online catalog is of a un73 68mm. I thought I was ordering a un73 68mm. I was shipped a un73 73mm. It didn't fit. The box had been opened and the bracket had been greased for installation. Someone else made the same mistake and returned the item. I didn't bother to return it.

      • Was this a gift?:
      • No

      (0 of 1 customers found this review helpful)

       
      5.0

      Old School XT

      By Mr Thumbs

      from Imperial Beach, Ca

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Durable
      • Easy To Install

      Cons

        Best Uses

        • Mountain Biking
        • Upgrade

        Comments about Shimano UN-73 Bottom Bracket:

        At this price it is a steal. This will last 10 years.

        • Was this a gift?:
        • No
         
        5.0

        great value

        By heartland

        from Indiana

        Verified Reviewer

        Pros

        • durability
        • Performance
        • price

        Cons

          Best Uses

          • Commuting
          • Fixed gear
          • Road

          Comments about Shimano UN-73 Bottom Bracket:

          I threw one of these in a fixed gear commuter that I built up a couple years ago. It has worked well through all the abuse I put it through, and still spins perfectly today. No complaints at all--a great component for not much money.

           
          4.0

          Cheap and durable

          By Nate

          from Cambridge, MA

          Verified Reviewer

          Pros

          • Durable
          • Inexpensive
          • Smooth

          Cons

          • Heavy

          Best Uses

            Comments about Shimano UN-73 Bottom Bracket:

            This bottom bracket has been powering my commuter for five years. It's a simple, tested design that seems all but impervious to the grit and dirt encountered on a daily commute.

            Some reviewers have hesitated about the plastic non-driveside cup. This poses no problem if properly installed. It's not designed to be torqued like the driveside -- just enough so the bottom bracket is secure. Over torquing plastic will cause it to crack.

            When installed correctly, this bottom bracket will last for years.

            A bit heavy, but for under $20 what do you expect?

             
            5.0

            Works as it should

            By DP

            from Ontario, Canada

            Verified Reviewer

            Comments about Shimano UN-73 Bottom Bracket:

            Replaced the one in my Fisher Big Sur that is 14 years old. Got rid of some creaking and spins nice and smooth.

             
            5.0

            great part, great price

            By Yep

            from SLC, UT

            Verified Reviewer

            Comments about Shimano UN-73 Bottom Bracket:

            These 7x series BBs are nice, I believe they are still made in Japan. I'd rather use these than one of the 2x or 3x series. I think the 5x are fine -- the only difference is they don't have the hollow spindle (a few grams). But at the price Jenson has them, this is the one to get. Thanks.

             
            5.0

            Perfect, especially for the price.

            By Michal

            from Tempe, AZ

            Verified Reviewer

            Comments about Shimano UN-73 Bottom Bracket:

            Perfect square taper bottom bracket. Very smooth and light for this old style.

             
            5.0

            works great

            By parden

            from canada

            Verified Buyer

            Comments about Shimano UN-73 Bottom Bracket:

            It works as it is intended, smooth

             
            4.0

            Super smooth

            By rccardr

            from Northern VA

            Verified Buyer

            Comments about Shimano UN-73 Bottom Bracket:

            This is Shimano's top level square taper bottom bracket and it shows. Metal cups, super smooth action, works great with the corresponding crankset.

             
            5.0

            Great bottom bracket

            By cmh

            from New Harmony, UT

            Verified Buyer

            Pros

            • Compatibility
            • Easy To Install
            • price
            • Quality

            Cons

              Best Uses

                Comments about Shimano UN-73 Bottom Bracket:

                Great bottom bracket for the price. I was able to keep an older mountain bike that I converted to a cross bike on the road for a few more years.

                Displaying reviews 1-10

                Back to top

                Previous | Next »

                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.