Shimano BB-UN26 Square taper Bottom Bracket
|Price:||$8.35 - $61.99|
- Square taper interface
- Sealed no service bearings
- Plastic left cup
- Shimano Reference Number: BB-UN26
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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.
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1.) A Shimano UN-26 or Shimano UN-55
2.) If I should go with 68 x 122.5, 68 x 123, or 68 x 127.5. (Note to readers: 68 x 123 was only available for the UN-26 but it also had 127.5 where the UN-55 only had 122.5 or 127.5)
I was really unsure what to get. So I thought well I would rather it be 3.5mm too long then 1mm or 2.5mm (2.5mm is equal to 2 1/2mm) too short. So I ordered the UN-26 68 x 127.5 thinking to myself " this will work fine for me." It was only after I ordered it I got a second opinion Since I live in IL I live about 2 and half hours outside Chicago. So I called a bike shop called Bicycles Etc in Naperville, IL located about an hour and a half away from me. I explained my situation I mentioned about above (I forgot to tell him about the 68 x 123 because that didn't occur to me until after I go off the phone.) The professional explained to me the 127.5 compared to the 122.5 would actually cause friction between the chain, the frame and the chain wheel especially if I used the third gear chain the most if used with the 127.5. So after talking with the 2nd professional, and hearing him tell me what would happen above, I thanked him. After I got off the phone, I got on my computer got on Amazon and I returned this item. I did have to call Amazon customer service because I the reason I picked for returning it wasn't because I ordered this by mistake even though it was but the main reason was that it was the wrong size. Plus I wanted to get my full refund back rather than a partial refund. However, I am still giving this 5 stars because the product was awesome and well built. Plus it had no damage when it came and it came with the plastic cup and it came with a new pair of bolts. The bottom bracket cup I expected. If it hadn't come with the bolts I would've happily just reused the old bolts from my old bracket.
This was going into a pretty dirty commuter bike. Rights side threaded in like a champ. So plastic=no good. The rest of the package is very good and typical of Shimano quality. However no matter how crappy the bike I would never buy another plastic cap BB. I didn't know this when I bought it. Now I have to buy all metal left side cup from Howe that will cost me another $7.95 and have to remove the pedal again. Make sure you get the correct BB tool and all the other tools you need before you start. Also a little anti-seize helps it thread in.
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.