Shimano BB-UN55 Cartridge Bottom Bracket

Item # SH-BBUN55
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$23.49
MSRP: $23.49


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Shimano BB-UN55 Cartridge Bottom Bracket
The UN55 bottom bracket is an improvement over the tried and true UN54. The sealed cartridge unit makes a great replacement part for hybrids, road bikes and older mountain bikes. The sealed cartridge bearings lock out contaminants like water and dirt, helping this bottom bracket last longer.
  • Maintenance-free sealed cartridge bearings with high-efficiency rubber seals
  • Square taper chromoly spindle
Shimano BB-UN55 Cartridge Bottom Bracket
  • WEIGHT 161g
  • MATERIAL Steel spindle
  • COMPATIBILITY 68mm bottom bracket shell
  • BB - COMPATIBILITY Square taper cranksets
  • RINGS None
  • RING MATERIAL N/A
  • LENGTHS 113mm
  • BCD N/A
  • Rating 4

REVIEW SNAPSHOT®

by PowerReviews
Shimano BB-UN55 Cartridge Bottom Bracket
 
3.9

(based on 7 reviews)

71%

of respondents would recommend this to a friend.

Pros

No Pros

Cons

No Cons

Best Uses

  • Commuting/city (4)
  • Road biking (3)
    • Reviewer Profile:
    • Avid cyclist (5)
    • Cycling Style:
    • Comfort oriented (3), Speed oriented (3)
    • Was this a gift?:
    • No (7)

Reviewed by 7 customers

Displaying reviews 1-7

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3.0

Wrong axle length

By xyz

from St. Louis, MO

About Me Avid Cyclist

Verified Reviewer

Pros

  • Lightweight

Cons

  • Did not work with my 1980s Trek 520 turing bike

Best Uses

  • Commuting/City
  • Road Biking

Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

Turns out that the axle is too short for my older Trek 520 Turing bike. With the cranks mounted the inner chain ring rubs on the bike frame

  • Cycling Style:
  • Comfort Oriented
  • Was this a gift?:
  • No
 
5.0

No Problems after 2000 hard miles

By TDUBS

from Buffalo NY

About Me Avid Cyclist

Pros

  • Durable

Cons

    Best Uses

    • Commuting/City
    • Mountain Biking
    • Road Biking

    Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

    Road, trails, Mud, Snow...No Problems

    • Cycling Style:
    • Speed Oriented
    • Was this a gift?:
    • No

    (1 of 1 customers found this review helpful)

     
    2.0

    I torched mine in one season

    By Central Ohio Mountain Biker

    from Columbus

    About Me Avid Cyclist

    Pros

      Cons

      • Wears Out Quickly

      Best Uses

        Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

        I wish they still made the heavier duty bearings in this style of BB. You can only get the 55 and it just doesn't hold up to a bigger rider (I am trying to get smaller, but not there yet)

        • Cycling Style:
        • Speed Oriented
        • Was this a gift?:
        • No

        (0 of 1 customers found this review helpful)

         
        3.0

        Does not fit

        By just some old dude

        from Tennessee

        About Me Casual/ Recreational

        See all my reviews

        Verified Buyer

        Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

        Despite very friendly tech support recommending the part, it did not fit my old ~1992 Mongoose Switchback.

        • Cycling Style:
        • Comfort Oriented
        • Was this a gift?:
        • No
         
        5.0

        It is what it is.

        By Raleigh Guy

        from Mpls, MN

        About Me Avid Cyclist

        See all my reviews

        Verified Buyer

        Pros

        • Durable

        Cons

          Best Uses

            Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

            It's a Shimano Bottom Bracket. It is good quality and fits. No problems.

            • Cycling Style:
            • Comfort Oriented
            • Was this a gift?:
            • No
             
            4.0

            Good Stuff

            By the menace

            from n. florida

            About Me Avid Cyclist

            Verified Buyer

            Pros

            • Versatile
            • Worked On An Old Frame

            Cons

              Best Uses

              • Anything That Needs It
              • Commuting/City
              • Mountain Biking
              • Road Biking

              Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

              I put this on an old Miyata frame that I converted to a single speed road bike. made the bike soo much better

              • Cycling Style:
              • Speed Oriented
              • Was this a gift?:
              • No

              (1 of 1 customers found this review helpful)

               
              5.0

              Oldie but goodie

              By Doug

              from Chester, WV.

              About Me Casual/ Recreational

              Verified Buyer

              Pros

                Cons

                  Best Uses

                  • Commuting/City

                  Comments about Shimano BB-UN55 Cartridge Bottom Bracket:

                  Thank you Nashbar for still stocking retro parts-sq/taper bottom bracket-to keep my '86 C-Dale MTB/commuter on the road.

                  • Was this a gift?:
                  • No

                  Displaying reviews 1-7

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                  Shimano BB-UN55 Cartridge Bottom Bracket

                  Shimano BB-UN55 Cartridge Bottom Bracket

                  Item No. »  SH-BBUN55

                  $23.49
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