Timeline for Why does my bike make a noise when I pedal hard?
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 1, 2012 at 16:18 | comment | added | Glenn | let us continue this discussion in chat | |
| Nov 1, 2012 at 2:19 | comment | added | Daniel R Hicks | Well, then, it sounds like something was defective from the factory. Probably if one could look at it first-hand it would be fairly obvious, but I can't see it from here (especially since you replaced the parts). (I hope the crank arm was replaced with the BB cartridge -- the hole in it no doubt got worn.) | |
| Nov 1, 2012 at 1:20 | comment | added | Glenn | All stock parts on a brand new bike a little over a year ago. The bolts were definitely not cross threaded. Again the damage just isn't consistent with that kind of abuse. | |
| Nov 1, 2012 at 0:39 | comment | added | Daniel R Hicks | It sounds like the crank arm was probably shot, with the hole in it not tightly fitting the BB shaft. (Or else it was the wrong type of arm for the shaft.) This would cause the bolt to keep loosening and there would be wear where the arm rubbed against the bolt. Or else somewhere along the way a bolt was cross-threaded and damaged the threads in the BB. | |
| Nov 1, 2012 at 0:35 | comment | added | Glenn | Agreed not the BB proper. The BB threading appeared and was even cleaned when replacing the crank bolt 3 times. Each crank bolt ended up with burrs in one spot rather than what I would consider typical wear (shifted/rounded threading). I think there was either fine debris that I couldn't remove of a manufacturing defect as this issues begin very early in the bike's life and I have gone over it many times trying to address the issue. Perhaps you are right and it wasn't adjusted properly in the beginning, but the damage to the threads just doesn't seem consistent to me. | |
| Nov 1, 2012 at 0:22 | comment | added | Daniel R Hicks | Of course, that was not a failure of the BB proper, but rather a failure of the crank-BB connection that resulted in damage to both. This is caused by allowing the crank fixing bolt to work loose, or perhaps never having it tight enough in the first place. There are generally noticeable warning signs (including noise) that the bolt is loose before damage occurs, if you know to look for them. | |
| Oct 31, 2012 at 22:01 | comment | added | Glenn | I just replaced a BB this week which was damaging the threading on the crank arm bolts and was producing creaks. I don't know enough about BB servicing and high end BB do know if that is a replaceable part. I do know that in my case, it was not a matter of the bearings being shot (grinding) however the BB did need to be replaced (at $30). Assuming a much more expensive bottom bracket I would certainly look into whether the piece was replaceable. | |
| Oct 31, 2012 at 21:37 | comment | added | Daniel R Hicks | I seriously doubt that the BB is in need of service. More of a grinding sound would be present in that case. But crank arms, pedals, and cartridge BB cups are all suspect. | |
| Oct 31, 2012 at 20:00 | history | answered | Glenn | CC BY-SA 3.0 |