Installation of a new Shimano sealed bearing bottom bracket on my GMC Denali Road Bike

My GMC Denali road bike's original bottom bracket had the left bearing fail, causing a lot of play and annoying noises. The problem was solved with a new better quality bottom bracket from our local REI which had a very smart bike mechanic which I showed him the old cup pieces and the shaft from the old bottom bracket, and he was able to pick out a perfect sized B.B. for my bike. This was my first time installing a bottom bracket. Once it was installed, it made an annoying clicking sound until it was broke in. Now it rides smoothly.

Category:

Howto & Style

Tags:

• denali
• road
• bike
• bottom
• bracket
• replacement

[stydel311]

My Denali bike (2009-ish, so little newer than yours) has around 500 miles on it. Should I rebuild the bottom bracket with new bearings and new grease, or should I just replace it with a sealed bearing like you? Also, how much did your new bearing cost?

[bikegeekmtdx]

@stydel311 If you want to rebuild it, sure...

If you want a sealed bearing, I payed around ~$25 for mine years back. The stock bottom bracket on my 2010 bike is not in the best of condition right now with a small amount of play, but it still works with 1800 miles on it.

[hagenar]

Drive side should have been tightened first.

I would have installed the drive side (it goes into the frame counterclockwise) and tightened it firmly. Next, the left side plastic ring gets threaded in (clockwise) and tightened lightly, because otherwise it cracks. There's no guarantee you've got the main cartridge in the frame properly if you do it in the order this guy did.

[bikegeekmtdx]

@hagenar After near 3300 miles, I've never had any issues with the BB, other than normal wear.

[aironalvarez]

@bikegeekmtdx which way does it loosen, if the bike is upright?

[bikegeekmtdx]

@aironalvarez I believe it loosened to the left. It's been awhile since I replaced the BB on this bike.

[thumpic]

man!! ditch the music and simply tell us what you are doing...........

[Chrisward71]

@lilrick98 better than no bike

[CubeComputerChannel]

@apocrepa I don't remember the exact size...

[apocrepa]

what BB size on this bike, :D just wanted to know

[mrsexpistols36]

the music was even better then your vid

[fladam1994]

mine does that, i should stop attempting wheelies i have been through three spindles, all bent, because of it and on my other mountain bike i have rounded the cranks off and now they are welded on. gonna have to replace the bottom bracket it seems.

[CubeComputerChannel]

@Xcokedav096 The only thing that was stated on it was "Shimano SIS", so I have no clue what kind it is. It's probably the most basic Shimano system available.

[Xcokedav096]

Was this a Shimano UN54?

[CubeComputerChannel]

@Xcokedav096 Rob Dougan - Clubbed to Death