Shimano UN54 Bottom Bracket

by Shimano

Product Features

• Maintenance free sealed cartridge unit
• 31-Grams, tapered spindle
• The standard for sealed-bearing square taper bottom brackets

Product Description

A good quality bottom bracket for traditional chainsets. Super-accurate bearings for smooth operation and improved durability. Durable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fitting. Lightweight hollow spindle. Maintenance-free sealed cartridge bearing assembly keeps out dirt, mud, and water for long bearing life. Fast and easy installation without adjustment. Narrow body allows clearance for cable routing under the bottom bracket.

Product Details

• Shipping Information: View shipping rates and policies
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B0039369B4
• Average Customer Review: 4.6 out of 5 stars  See all reviews (29 customer reviews)
• Amazon Best Sellers Rank: #4,021 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • #1 in Sports & Outdoors > Bikes & Accessories > Components & Parts > Bottom Brackets

Customer Reviews

Most Helpful Customer Reviews

10 of 11 people found the following review helpful:

5.0 out of 5 stars FIX the sloppy crank!, December 5, 2009

By 

Gene Wohlsdorf "Gene" (North Dakota) - See all my reviews

Amazon Verified Purchase

This review is from: Shimano UN54 Bottom Bracket (Sports)

My bottom bracket was wearing out fast. There was lots of "play" in the crank, and when I pedaled hard, it felt sloppy and made a clunky noise. I took my bike to a shop to have the bottom bracket repaired. They must have taken it out and worked on it, but I suspect the original was not a sealed bracket. They did a nice "tune up" of everything else, but only tightened the bottom bracket instead of replacing it. I didn't realize this until I got home and rode it. It was not good enough.

So I decided to do it right. You need an extractor to remove the pedal arms. (It's a kind of gear-puller.) You also need a special socket to loosen up the old bracket, and maybe a good pair of channel locks or vice grips, depending on what's holding it all together. On my bike, I had to turn BOTH SIDES FORWARD to loosen the bracket. (I learned this the hard way.) It rides like new now. I even replaced the bottom bracket on my step-daughter's bike. Remember to tie the bike off the ground, right side up (to some garage rafters, maybe) in order to make it easy to work on. You'll need to measure the overall length of the bracket, to the outer edges of the square ends of the shaft, and the inner length of the cylinder, to get the right part. Make sure you get the right one. Ask a bike expert if you need some help. I did!

As an Amazon affiliate myself ([...]; My AMAZON Site, My STORES) I'd recommend this product.

6 of 6 people found the following review helpful:

5.0 out of 5 stars Straightforward installation, October 30, 2010

By 

Jeff Kurtock - See all my reviews

Amazon Verified Purchase

This review is from: Shimano UN54 Bottom Bracket (Sports)

This cartridge bottom bracket is the now-standard replacement for loose-ball bearing bottom brackets. For square-taper cranks. Easy to install. Note that one of the threads is left-handed, and many torque wrenches do not "click" in reverse. Size is by thread diameter and length of crank axle.

4 of 4 people found the following review helpful:

4.0 out of 5 stars Good Replacement Bottom Bracket Cartridge, July 11, 2011

By 

H. Nakayama (Memphis, Tennessee) - See all my reviews
(REAL NAME)   

This review is from: Shimano UN54 Bottom Bracket (Sports)

Used the 68-118 to replace a 68-117 cartridge, so it did stick out slightly more than the original, but works well enough. Noticed that some people prefer these to the older style bottom brackets with the adjustable cones and ball bearings. Call me old fashion, but I prefer being able to simply take apart the bottom bracket, clean-out the parts, re-grease, put back together, adjust and go, rather than having to go shopping for a whole new part every time.

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