HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Articles FAQ Contact About




Post new topic Reply to topic  [ 12 posts ] 
Author Message
PostPosted: Tue Jun 30, 2015 3:38 am 
Offline

Joined: Sat Apr 30, 2011 3:37 am
Posts: 55
Hi,

I have a Chorus UT crank with about 7000 miles on it. I ride it year-round in all conditions, and recently started hearing some creaking noises. I'm not 100% sure it's the crank bearings - I did remove the chain and spin the crank, and it felt fairly smooth, but that's probably not a good test. I've eliminated pretty much everything else, by using a different wheel, quick release, cleaning the chain and derailleurs, and checking the chainring bolts, but I can't seem to get rid of the noise.

As a last resort I'm wondering if the bearings can be the cause of the noise, and with this mileage should I be changing them out anyway?


Thanks for your insight!


Top
 Profile  
 
Posted: Tue Jun 30, 2015 3:38 am 


Top
  
 
PostPosted: Tue Jun 30, 2015 8:34 am 
Offline

Joined: Sat Feb 08, 2014 4:22 pm
Posts: 24
Location: Minsk, BY
If your bike doesn't have threaded BB, then I'm pretty sure that the source of this noise is BB.


Top
 Profile  
 
PostPosted: Tue Jun 30, 2015 9:42 am 
Offline
User avatar

Joined: Fri Jan 15, 2010 7:22 pm
Posts: 223
Location: Les Pays Bas
Campa states that the bearings and cups of your crankset need to be re-greased every 4000 miles / 6000 kilometres. For me this implies that the bearings should last more than the 7000 miles you put on them. Campa does state however the service interval is largely dependant of the conditions you ride in.

Someone correct me if I am wrong but I think it is possible to extract the loose balls and inspect them for wear and tear.


Top
 Profile  
 
PostPosted: Tue Jun 30, 2015 9:51 am 
Offline

Joined: Fri Jun 03, 2011 6:30 pm
Posts: 53
My cups wore out in about 2 months and I had a devil if a task finding the source of the creek. New cups =no creek for me.


Sent from my iPhone using Tapatalk


Top
 Profile  
 
PostPosted: Tue Jun 30, 2015 12:01 pm 
Offline
User avatar

Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1238
Location: Toronto
Very much doubt that bearings would cause a creak. Bearings are sealed units - no regreasing. Have not seen loose balls since the '80's.

OP you don't say what type of BB and cups you have. If pressed-in cups then that would be suspect.

I'd be looking elsewhere for creak - like pedals and cleats.

Bearing life is totally dependent on riding conditions, and how much crud is able to get into them.

UT is one of the easiest cranks to remove and inspect. Just follow instructions carefully. Having the cranks out, it is very easy to feel if the bearings are smooth or rough.

_________________
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


Top
 Profile  
 
PostPosted: Tue Jun 30, 2015 12:58 pm 
Offline

Joined: Mon Apr 12, 2010 5:58 am
Posts: 32
My right is still running good, looks new. More than 7000 klms Though left side will be changed it has some bit of rust.


Top
 Profile  
 
PostPosted: Tue Jun 30, 2015 1:08 pm 
Offline

Joined: Sun Oct 05, 2008 8:09 pm
Posts: 1164
Location: Aix en Provence
UT bearings clearly depend on conditions, some of mine are going very strong after years of service but after PR challenge this year I had to change the SR bearings right after that ride. That crankset had less than 2K km, they got contaminated somehow and the morning after the ride I could barely turn the crank....


Top
 Profile  
 
PostPosted: Tue Jun 30, 2015 1:21 pm 
Offline

Joined: Sat Apr 30, 2011 3:37 am
Posts: 55
Sorry, forgot to mention that I'm using a good old threaded bb. Record and SR use ceramic bearings, while chorus is steel, right? Ive been searching the forums and it sounds like the ceramic ones do better on the wet.

Either way it sounds like I should at least attempt to regrease the cups and bearings.


Top
 Profile  
 
PostPosted: Tue Jun 30, 2015 1:31 pm 
Offline

Joined: Sun Oct 05, 2008 8:09 pm
Posts: 1164
Location: Aix en Provence
You may also look at changing the cups, I think some of the early ones were subject to some clicking.


Top
 Profile  
 
PostPosted: Tue Jun 30, 2015 2:02 pm 
Offline
User avatar

Joined: Sun Nov 07, 2010 9:14 pm
Posts: 1902
Super Record is the only one with the "CULT" bearing system, which utilizes both ceramic bearings in specially treated (cronitect) races. They are unsealed and I have yet to ever have to replace a set in either their cranks or hubs. Record uses the "USB" bearings which have the ceramic balls but not the special races. I don't have any experience with the Record bearings other than installing them. Chorus have steel sealed bearings and in my experience do need to be replaced more often. Can't say for sure that's where your creak is originating but it's possible, depending on the conditions they were used in. You'd need a couple special tools to remove the bearings and then press them properly back onto the crank. Chorus bearings are not outrageously expensive so I think I'd just replace them rather than removing the seals, cleaning and regreasing, just to be sure. You don't mention the frame you are using but has the threaded BB been properly faced at some point, to ensure the cups sit perfectly square with each other? If they are not square, the crank may not spin as freely as it would otherwise and will certainly cause premature wear on the bearings. In any case, it would probably be a good idea to remove the cups as well and thoroughly clean and regrease the threads. I always use a copper based anti seize compound for these threads as I don't remove them often and this will help prevent them from seizing up in the threads. On one bike I worked on the cups had been installed "dry" with no grease or anything and galling was beginning to occur but I was still luckily able to remove them before too much damage had set in. Good luck as I know these mystery creaks can be so annoying sometimes to pinpoint and fix completely.

_________________
My Colnago C59
My Special Colnago EPQ
Trek Emonda SL


Last edited by Calnago on Tue Jun 30, 2015 2:31 pm, edited 1 time in total.

Top
 Profile  
 
PostPosted: Wed Jul 01, 2015 2:47 am 
Offline

Joined: Wed Oct 15, 2014 6:12 pm
Posts: 122
I see this as a chance to upgrade your BB Bearing from the steel Chorus bearing to the superb ceramic Super Record's.


Top
 Profile  
 
PostPosted: Wed Jul 01, 2015 5:28 am 
Offline

Joined: Sun Apr 15, 2007 6:44 am
Posts: 156
UT is simple to service but the downside is that it isn't particularly well sealed. My first set of steel bearings rusted out fairly quickly and I've also experienced creaking issues (in a threaded BB setup) which appeared to originate from water ingress.

I now repack steel bearings from new with Sta-Lube marine grease, including a generous smear in the cups, and have had zero issues for several years. Water is still getting in (visible droplets) but isn't able to cause any trouble.

The repacking process is a bit fiddly, involving removing the plastic bearing cage, injecting grease and then repositioning the balls evenly to allow the cage to be reinstalled.

I considered ceramic but the cost vs benefit didn't appeal given that repacking works so well, albeit at the expense of a little extra bearing drag.

In addition to BB facing alignment, UT setup is also sensitive to BB shell width which can result in clicking/creaking issues so maybe add that to your list to check.


Top
 Profile  
 
Posted: Wed Jul 01, 2015 5:28 am 


Top
  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 


Who is online

Users browsing this forum: AndreLM, aronjancso, BeeSeeBee, Bing [Bot], kookie, Mario Jr., mimason, mr4fox, Noccy, rgamble, spartan, tinozee, wingguy and 54 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Cyclingceramic bearings anyone ?

in Road

LouisN

1

589

Thu Oct 30, 2014 4:45 pm

Tillquist View the latest post

There are no new unread posts for this topic. BB 86-4130 Bearings

in Road

ironman1

6

68

Wed Jul 01, 2015 10:41 pm

Mario Jr. View the latest post

There are no new unread posts for this topic. Giant headset bearings

in Road

Tomstr

0

282

Tue Nov 04, 2014 3:52 pm

Tomstr View the latest post

There are no new unread posts for this topic. Cannondale headset bearings

in Road

fifarafa

5

432

Wed Mar 18, 2015 9:44 am

fifarafa View the latest post

There are no new unread posts for this topic. BB30 bearings, how quickly do you go through them?

[ Go to page: 1, 2, 3 ]

in Road

Sykes

40

3209

Thu Oct 09, 2014 8:53 pm

FIJIGabe View the latest post


It is currently Wed Jul 01, 2015 10:48 pm

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB