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Shimano BB-UN26 Square taper Bottom Bracket

by Shimano
| 10 answered questions

Price: $8.24 - $74.99
Sale: Lower price available on select options
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  • Square taper interface
  • Sealed no service bearings
  • Plastic left cup
  • Shimano Reference Number: BB-UN26

Frequently Bought Together

Shimano BB-UN26 Square taper Bottom Bracket + BIKEHAND Bike Bicycle Shimano Bottom Bracket Removal Remover Tool + Park Tool Crank Puller for Square Taper Cranks
Price for all three: $68.97

These items are shipped from and sold by different sellers.

Buy the selected items together

Product Description

Shimano UN26 bottom bracket features a plastic left hand cup. Sealed bearings and high quality spindle make it last for years and it's maintenance free.

Product Details

  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B007FP6NB8
  • Item model number: STPB-P
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (95 customer reviews)
  • Amazon Best Sellers Rank: #29,910 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

4.3 out of 5 stars

Most Helpful Customer Reviews

6 of 6 people found the following review helpful By DrBob on February 21, 2013
Size: 68 x 117.5Color: Silver Verified Purchase
This bottom bracket is very smooth and reasonably solid. It is a very good replacement for the loose bearings and cups normally fitted in less expensive bicycles. I recommend it specifically for an inexpensive rebuild of a nice older frame -- you know the one, you like it, it fits well and looks nice but isn't really that high-end bike that demands the very best components and certainly doesn't draw oohs and aahs from the bike snobs. Enjoy the ride with smooth, nice functioning components.
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8 of 9 people found the following review helpful By Graham on April 4, 2011
Size: 68X122.5Color: Silver
this BB is fine for onroad and light off road but it may be worth the extra 8 bucks for the UN54 which runs much smoother and is by far stonger.
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7 of 8 people found the following review helpful By D. Monk on September 9, 2009
Size: 68 x 123Color: Silver Verified Purchase
I bought this bottom bracket as a replacement for original equipment on a Diamondback mountain bike. I noticed that despite my effort to match the dimensions, the bottom bracket wouldn't thread fully into the bike but I don't fault the product for that and in any case functionally it works just fine.

The action of the bottom bracket is very smooth. The plastic cup included with the product got a bit beat up as I tried to install it, so I ended up keeping the original metal cup from the original equipment bottom bracket. I would have preferred a metal cup.

Overall, based on the Shimano brand and reasonable price, I would purchase the item again and so far it is performing well.
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4 of 4 people found the following review helpful By John Abbott on October 10, 2011
Size: 68 x 123Color: Silver Verified Purchase
Bottom brackets shouldn't just break. Mine did.
According to the instructions on my bike, the bottom bracket was a Shimano. But when I pulled it, it was a different brand. Maybe that's why it broke?

The Shimano BB-UN26 is a pretty common cartridge on bikes. This one has a hard plastic locking ring/sleeve, which is my only complaint. Having said that, the plastic might allow for easier replacement on threads that are rusted or damaged. Just pay close attention to the instructions, because you do not want to add a petroleum product onto a plastic locking ring.
Pay attention to the direction of the threads!

If you have a torque wrench, use it. This is the 3rd time I've been able to use mine, and it felt good to know that I was torquing the bracket to the correct tightness.
Best of luck.
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9 of 11 people found the following review helpful By John Alldredge on March 19, 2013
Size: 68 x 123Color: Silver Verified Purchase
In my old age, I have lost patience with loose ball bottom brackets and if they give me any grief at all, I yank 'em out and put in cartridge BB's like this one.

I use the ordinary Shimano ones like this and have never had a problem with any of 'em in the fifteen years I've been doing this on my own and others' bikes.

You do have to make sure you get the correct threading, shell width, and axle length, of course.This size, 68 x 123 mm, fits a lot of low end and mid-grade mountain and hybrid bikes but you need to measure to be sure.
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3 of 3 people found the following review helpful By Travis Feagle on February 27, 2013
Size: 68x127.5-mmColor: Silver Verified Purchase
Bought this to replace old ball bearing bottom bracket that exploded to have a more reliable bottom bracket. Product came with instructions (not that they are really needed) but it did have torque numbers which is a good thing.
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3 of 3 people found the following review helpful By Amazon Customer on March 31, 2012
Verified Purchase
Very easy to install; runs very smooth. I'd deduct a star for the plastic washer except that it doesn't seem to degrade the performance and at this price it seems like a worth trade-off. If you are concerned about the plastic piece, the next model up is all metal.
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6 of 8 people found the following review helpful By Jack H. Linn on November 27, 2010
Size: 68 x 123Color: Silver Verified Purchase
This product was purchased because it is the reccommended bottom bracket for the the Alivio crankset that I reviewed earlier. I've read in some of the customer reviews that this product fails under heavy use. That really wasn't a concern of mine as my bike isn't ever subjected to heavy use. I use it mostly for short trips within my neighborhood. This BB is very smooth and it's easy to install if you have the proper tool. It's a perfect fit for what I use it for. It's also priced right.
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