How to replace a bicycle bottom bracket. Shimano BB UN300 failure

👍

Colocar o lado esquerdo antes de travar o direito para não sair de centro e causar dificudade de rosquear essa peça

I have same one my cube Analog 26 hardtail 2012 😇

Whats the length of the spindle of the bottom bracket you install? How many mm?

That's a good idea, that threaded tool holding the bb tool firmly engaged. If the spindle were hollow all the way through, I definitely would have shoved a quick release skewer through for the same purpose. This looks way better. I never thought about lubing the inside of the cup. BB shell was so out of square, there were marks on rhe edge of the center shell drive side. That bb ran awful from day 1! It never creaked surprisingly. 4 hours of filing and test fitting with machinists bluing, and all was well. Probably could also have not tightened the drive side cup until the flange bottomed against the shell. All tightening from the non drive side! It's hard to measure exact chain line on the track bike, but probably could get1mm outboard of where it was, or 2mm inboard as it is now. For $20, I got 8200 miles out of the last one despite the flaws!

czemu ta miska się nie chciała wkręcić?

どうしたシマノ。

this type of bb are the worst. goddamn it

Parabéns pelo trabalho ! 🇧🇷

which is the extra tool that you use to tighter the bottom bracket removal tool with the axle of the bottom bracket? did you make it by yourself?

Де діствти такий болт для каретки ?

Primero se enrosca la copa del lado izquierdo para que no de problemas al enroscarle. Por último se enrosca eje y luego se ajusta. 🚴🚴🚴.

Movimento Central amigo não precisa aperta muito

Same issue here with the left bracket

Gościu ale masz tą rure do odkręcania i przykręcania

I also keep TOKEN and NECO as they are reasonably good quality .

Rattle gun assembly in China's factories is the planned "KILLER" of bicycle components , even Giant , Trek and Dorel brands are guilty of it .

動画中に出てたVPボトムブラケットみたいにベアリングのシールが剥き出しのBBは、組んだ後に水道ゴムパッキンをグリス塗ってスクエア軸に嵌めておくと防水防塵になります。
（シマノのBBみたいに確りしたダブルシールじゃないけど）

Currently, shimano failed the quality control.
Many shimano parts are going wrong, BB, derailleurs and shifters...

If you dont tighten the drive side cup completely the unit can move a little and the left cup goes on easier .
Once the left cup threads have catched you can screw it halfway in, tighten the driveside cup and then tighten the non driveside/left cup.

Sometimes when the alignment of the threads in the housing is off or threads slightly damaged you can try to screw in the cup in an alernating matter (1turn left/1turn right aso.)

That is of course not the perfect way because the bearings will be shot quickly, but that's relative.

When the bb housing is warped then you need luck and/or a bb cutter 😮

Keep on rollin' 👍

No words equals unhelpful. What are you spraying in bottom bracket. Is that grease? Super lame.

ShiTmano >> FIFY. Of course it FAILED. I could see this was CHEAP JUNK the second I got it out of the box, so I took it back.
Get a FSA 7420. It has bigger bearings and overall is 10 times better machined. Only $10 more or so. You get what you pay for.

SUPER SUPER BRAVO 👍👍👍

don't change anything, I love this channel, bye!!

I bought same crap , same issue with the left bracket !!!
Sent it back what a garbage

Couple of mistakes....not ok.🤔
But at the end works ok.

⚠ ❓ ⚠
ASK YOUR QUESTIONS
👇👇👇

For what it's worth: The BB UN300 has rubber seals on the caps but the seals on the bearings themselves seem to be pretty crap so if water gets in past the seals or down the frame into the BB shell I think the water gets trapped and rots the bearings out either way. Pulling the bearings off and replacing them with something better isn't impossible.

Don't tighten the drive side the whole way before you install the none drive side..

Omni Racer makes great BB Ti and regular. And the you can look at IRD . Don’t know how the original Shimano died like it did.

Don't use the UN-300. A better choice for a lower priced BB is FSA. I've had no problems with the FSA. Of course I do like the Shimano UN-55 best. To each his own

Hi, great video, and can you please explain the old one was 127.5mm, but the new one is 113mm, so can you pls , is the chainline be same ?

I would like to report a problem I experienced with the un300: the cable guide screw under the BB interfered with the BB and could not be installed correctly. This caused the BB to tilt slightly. So I installed washers on the screws to prevent interference and solved the problem. Next, after riding only 30 km in the rain, I removed the BB and observed that the steel tube was rusted. I think it was probably caused by rainwater entering through the frame, not through the sealed bearing. un300 seems to be very sensitive to water and the bearing collapses in less than a year. But it is good to be able to test a variety of cheap cranksets.

Najpierw lewa miska prawie do końca gwintu a potem suport z prawej dokręcić i lewą miskę dokręcić do końca Ty zrobiłeś błąd dlatego niechciała Ci się wkręcić lewa nowa miska

May I know what kind of green grease you use

Cambie el eje de pedalier de mi bicicleta por ese modelo y no tuve ningún problema. Muy buena la tapa del lado izquierdo.

Do you know if that model of bottom bracket fits every Triban bike ? Or is it depending on the size of the frame ?

Doesn't anyone know what kind of bearings are there?

mam zerwany gwint w mufie. co robic? support się niewkręca całkowicie.

شكرا على الفديو ياورده

The breathing and the mouth sounds are freaking me out. Had to mute it.

You're the one wrong about this one to install the Square type is To put it both sides don't tighten the drive side yet because that will result uneven spindle tighten the non drive side first before tightening the drive side so it will align the spindle

Thanks for sharing the video.
What is the tightening torque achieved by this homemade pipe? Looks at the high end compared to recommended 50-70 Nm torque.

❤ If you liked this video,
🙏 share this video with your friends
📈 it will help the development of the channel!
❓ ask your questions