Bicycle Mechanics - Diagnose Ominous Sound

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ylanl
06-07-05, 11:03 AM
I have an old Univega mountain bike. It's recently started making these kind of cracking or knocking sounds when I'm pedaling, especially when I'm pushing hard. Since I can feel something through the cranks that corresponds to the sounds I'm assuming the problem is somewhere in the crank assembly. I cannot see anything visibly hitting anything else, nor can I see any cracks. Could it be the bearings? Any other ideas?

supcom
06-07-05, 11:14 AM
When is the last time the bottom bracket bearings were repacked?
Noah Scape
06-07-05, 11:17 AM
Does it seem to be associated with a particular side of the bike? It could be an issue with a pedal rather than the bottom bracket.

neil0502
06-07-05, 11:19 AM
http://www.parktool.com/repair_help/creaking_and_squeaking.shtml
Noah Scape
06-07-05, 11:24 AM
http://www.parktool.com/repair_help/creaking_and_squeaking.shtml


Good link!
ylanl
06-07-05, 12:13 PM
Hmmm... that would be never...
ylanl
06-07-05, 12:15 PM
Does it seem to be associated with a particular side of the bike? It could be an issue with a pedal rather than the bottom bracket.

It does seem to do it more on the right side, but the fact that it still does it on the left would seem to rule that out no?
roadrasher
06-07-05, 12:24 PM
check your chain ring bolts
Noah Scape
06-07-05, 12:41 PM
If it is more of a creaking sound vs a knocking sound, I'd try snugging up the crankarms and see what happens.
Al1943
06-07-05, 09:24 PM
Does the creak happen when sitting, standing, or both?
ylanl
06-07-05, 09:58 PM
Does the creak happen when sitting, standing, or both?
Both--any time I'm pedaling.