Shimano BB-UN26 Square taper Bottom Bracket
|Price:||$9.22 - $75.99|
- Square taper interface
- Sealed no service bearings
- Plastic left cup
- Shimano Reference Number: BB-UN26
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Top Customer Reviews
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.
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.
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.
Other than the weight, which is to be expected at this price point, this is a solid bottom bracket that will work for years without any maintenance.
Source: I am a professional bicycle technician with over 15 years of experience.
Only complaint is the plastic non-drive ring; may be easily damaged during tightening. Just be careful when you're threading it in.
I replaced an old cartridge bearing BB with this one. The cartridge bearings, spindle, and cups were damaged beyond repair.
Much better than the old cartridge. It's sealed and it spins with less friction.
Grease the threads with a non-petroleum product as it may damage plastic cup. Alternatively, you may use a medium strength Loc Tite.
Great price, great seller (resides in my state, fast shipping). Good quality and looks to last for years.
Most Recent Customer Reviews
make sure you get the right one, they all look alike, double check the numbers on it.
anyways heres the review: excellent product, installation would be easier if the... Read more
I purchased this 68x122.5mm to replace the bottom bracket on my Genesis Astra which just used the normal bearing cups, installation was easy, make sure to use plenty of lube and... Read morePublished 1 month ago by Ryan
Installed this myself two months ago. Has been working flawlessly since!Published 1 month ago by Kristopher C. Hite
Converted from old open bearings to this sealed BB and it couldn't have been easier. The only thing I wished I got a metal bushing rather than the plastic. Read morePublished 1 month ago by Jerry Sollien
Amazon could add value by including a mechanical drawing of the part with the description. Note that some of the photos show a flat washer on the shaft on the sprocket side. Read morePublished 2 months ago by Amazon Customer
Not a bad little bottom bracket! I'm considering buying another for another build I'm doing because its doing so well with my current daily commuter. Well worth the price!Published 3 months ago by Otizzle4Shizzle