|D/A bottom bracket clicking - help please||ChrisA|
Mar 26, 2002 8:35 AM
|I have a D/A bottom bracket with aprox. 7500 miles on it. Very little in the rain. I've removed and cleaned it about every 2000 miles. It starting making a clicking noise last week when pushing a big gear or when standing. I disassembled the entire thing, down to the 36 roller bearings and 36 ball bearings. Cleaned everything and reassembled. No surfaces looked rusty, worn or pitted. Now it still clicks when standing on the pedals in both chainrings. It clicks each time the right pedal is at about 4 o'clock. Could the BB just be wornout and need replacing? How long can I expect to get out of one of these? I don't mind the finicky nature of installation and maintenance. Thanks.|
|clicking = not tight (nm)||str8dum1|
Mar 26, 2002 9:44 AM
|Bicycling mag says to grease the splines before||Paul|
Mar 26, 2002 12:06 PM
|assembling. I just recently had mine off, and I didn't do this. Will next time as it makes sense. I had clicking when standing, and took apart and cleaned the crank arms. Tighten real good using 1/2 driver, and no problem. Mine is 4 years old with many thousands of miles. No problem so far. I weight 162.|
|re: D/A bottom bracket clicking - help please||Mike Prince|
Mar 26, 2002 2:49 PM
|Are you sure it's the BB clicking? Your 4 o'clock reference tells me it could be something else. If it only happens when standing, it could be a variety of things other than the BB. Stem, bars, chainring bolts, pedals/cleats, rear hub bearings or a frame issue.
Not trying to confuse the issue but I'd check the above before you go crazy on the BB. Sounds like you know what you're doing with the BB as you have done maintenance on it several times. The other potential causes of noise are a lot easier to check (and fix) than ripping the BB apart again.
|re: D/A bottom bracket clicking - help please||the bird|
Mar 26, 2002 4:45 PM
|Try greasing the pedal threads,been there done that,cured the same creak...|
|7500 miles??? Worn out....get a new one....||Barnyard|
Mar 26, 2002 5:08 PM
|Worn out at 7500 miles? Better not be.||Kerry Irons|
Mar 26, 2002 8:10 PM
|And did you note that he said he looked at the bearings etc. and they showed no signs of wear. I DA wears out at 7500 miles, then it's junk (at that price). While some may not like it, I've not heard it called junk. I think Barnyard is shoveling some BS our way. (Surprise?)|
|At what price??? A dura ace bottom bracket is not expensive||Barnyard|
Mar 27, 2002 8:14 AM
|Why would you think that they last forever? They are a weight conscious bottom bracket. I've never heard longevity as being a virtue of a dura ace bottom bracket. Sorry..|
|At what price??? A dura ace bottom bracket is not expensive||grzy|
Mar 27, 2002 8:47 AM
|They'll last pretty much forever with proper care and feeding. 7,500 miles is nothing.|
|grzy..I like to see that last post in a shimano/ campy discusion||Barnyard|
Mar 27, 2002 9:22 AM
|and people say the same thing about headsets, that they'll last forever if you take care of them.|
|grzy..I like to see that last post in a shimano/ campy discusion||weiwentg|
Mar 27, 2002 2:28 PM
I think your service time frame is a little soon. Unless you are riding in the rain a lot.
Also, I'm not a fan of WD 40. I would recommend a good degreaser. I personally love Pedros Orange Peelz. WD 40 does not really degrease the BB well enough. And it will continue degrease (at a slow rate due to it's lack of power) the new grease if you don't wash it out before re-greasing the BB.
So, I would:
1)Degrease the BB with Pedros (you can leave most of the BB in the frame and just take out the adjustable cup).
2) Rinse the BB with some soap and water (to wash out and neutralize) the degreaser so it does not continue to degrease what ever
fresh grease you put in)
3) Re-grease and adjust you are done. Just about any bicycle grease will do. As long as you have enough grease, it is well adjusted and you service it periodically, the BB will do you well for miles.
Initially the BB comes packed with grease. It is a good grease just normally there is not enough of it. So for me, I just add some grease to what is already there (yeah I let the two mix). When I service it, I'll clean it out the dirty grease and add just what ever grease I have. Gonna sound like a commercial now but I live Pedros Syn Grease.
As far as service time frame, every one is a different case dure to climate.
If you are riding in the rain a lot then yes once a month. But, I'd say riding (for most people) in periodic rain, once every 6 to 8 weeks should be more than enough.
During the summer once every three months (or more) should do. It is easy to do so even if you did it too often it would not take that long. Better safe than sorry.
Vincent Gee - Mechanic
US Postal Service Professional Cycling Team <<
take note of the 'do you well for miles bit' ... mine hasn't gone mega-mileage yet, but this guy obviously handled some that did.
as grzy said, proper care and feeding.
Mar 27, 2002 3:18 PM
|So which side of the fence are you playing? It has nothing to do with Campy vs. Shimano. |
The stuff does last if you take care of it - there are lots and lots of data points out there to back me up. A couple of early failures doesn't prove much - the early failures can usually be tied back to the owner. I don't baby my stuff, and I've got boxes of broken stuff to show for it, but if you keep things adjusted, cleaned and lubed they will go a long way. Many people's problem with the DA BB is a result of not having it properly adjusted - once there is play in the unit it's just a matter of time before it wears out. I'm always amazed by the number of people with high end stuff that is poorly maintained then they blame the component. It's like complaining that you have to put gas in your tank or your car will stop running. Or that the clutch will wear out in very few miles if you let it slip all the time. Well duh.
Pretty much all of the bearings in a quality bicycle are technically up to the job of running for a very long long time, it's just that if they're allowed to go out of adjustment, run dry our become contaminated they don't do well. When was the last time you saw a bearing race suffer gaulling or failure related to over heating (i.e. a true "bearing failure")? The reason why King can warranty a headset for 10 years is b/c they use precision bearing races and you can't screw up the adjustment and it's hard to get any grime in or grease out of the race. It stays in nearly perfect shape even with all the use, abuse and pounding. I've seen King headsets transfered from one tired MTB to another when frames fail, wheels get taco'ed and lots of other indignities.
What is it that wears a headset out? It certainly isn't load or rpm.
|I bought a new one for $45.||ChrisA|
Mar 27, 2002 11:50 AM
|To respond to some of the previous posts, the crank/spindle interface is greased. The sound is definately coming from the BB. I'm going to remove the left crankarm and tighten a little more as suggested above. However, in previous installations, I always tightened just until the play went away, not any further. I bought a new D/A BB in case tightening further doesn't work. I don't think BBs should last anywhere near as long as a headset. The bearing movement in a headset is minimal compared to a BB, and sees less grime and grit due to its location on the bike.
Thanks for your input.