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Shimano UN54 Bottom Bracket

Item #: BB309F06
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Finally, a good model for older bikes that already have square taper cranks. We like this one cause theyre cheap to replace when they finally give up the ghost and come in virtually every size you could ever need, so you can get your chainline just right.
  • 313 grams
  • JIS taper (shimano, sugino, truvativ, and most other cranks)
  • Does NOT include crank bolts


by PowerReviews

(based on 6 reviews)

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Reviewed by 6 customers

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Displaying reviews 1-6

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Good basic bottom bracked.

By maydog

from Minnesota

About Me Competitive Cyclist

Verified Reviewer


  • Durable
  • Easy To Install


    Best Uses

      If you need a new square taper bottom bracket - get it. I am not a fan of the plastic lockring, but it works.

      • Was this a gift?:
      • No

      Good mid-level bottom bracket

      By pinoy rider

      from Hesperia, CA

      About Me Avid Cyclist

      Verified Reviewer


      • Easy To Install


      • Heavy

      Best Uses

      • Keeping old bikes working

      good basic mid-level bottom bracket... if you simply have a square taper crankset that you don't want to let go, these are good mid-level price bottom brackets

      • Was this a gift?:
      • No

      cheap, reliable,...

      By Greg

      from Garden Grove, Ca Usa

      cheap, reliable, solid, spins, smooth. Install and forget about it. Never a problem, never a wobbly crank. Perfect for your square-taper crank on your beater commuter/winter bike.


      not disappointed but...

      By Craig

      from Yorkville, Il United States

      not disappointed but not liking being slower either. the seals are needed for bad weather and off road muddy conditions, i would prefer something that rolls easier though


      This is THE best...

      By Julius

      from San Diego, Ca United States

      This is THE best value bottom bracket square taper in the market even though it seems they are phasing out in style. ISIS and externals are dominating the market. However if you are purist SS mtb or roadie these are must haves. I have them for my Eno cranks and they are still working like new mud and dry. Highly recommend for the budget rider.


      I replaced the stock...

      By Sean

      from Auburn, Wa

      I replaced the stock Truvativ BB on my Kona Dew Deluxe after thousands of miles of abusive, all weather commuting miles. I had no idea how bad my old BB was until I replaced it with this. Mind you, this isn't some elite high performance, weight weenie gimmick part.

      Displaying reviews 1-6

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