Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-29-08, 08:19 AM   #1
osmium
Senior Member
Thread Starter
 
Join Date: Sep 2003
Location: Atlanta, GA
Bikes: 3 Woodrup Star Trophy models, Bianchi Pista, Ochsner, Rockhopper, Puch Mistral Leader, Mercian Touring, Bridgestone XO-2, Basso Gap
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Campy Chorus 8 speed hub woes

Hi all,

Was in the process of building a Basso Gap road frame and got some bad news. It appears the Campy chorus hub body on my 8 speed rear wheel wants to try and seize.(LBS said it wants to run like a fixed gear) Went to bike shop and checked it out. It engages fine when pedalling, but when you stop and hold the cranks still the rear wheel slows down quickly. It is almost as if there is just a lot of gunk in the free-hub assmbly. The axle appears to be rolling smoothly. Not fun. Anybody else experience this. May I take the hub body out myself and service it to see if I can fix it? Is my only hope to go and find another used wheel. LBS said they wouldn't service the freehub body. However, found another shop in town that is a campy pro shop that said they would take a look at it. I'll probably take it to them next weekend and see what they say. Thoughts anyone.

Roland

Currently stalled on 90s Basso gap buildup.

Last edited by osmium; 03-29-08 at 01:03 PM. Reason: Went and saw what the problem was.
osmium is offline   Reply With Quote
Old 03-29-08, 02:13 PM   #2
danacf
Senior Member
 
Join Date: Mar 2008
Location: Albany, NY
Bikes:
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I serviced a 1992 8sp chorus hub every 1500 miles for about 7 years. It did seem to get dirty quickly, but it's not difficult to clean and regrease. I don't have the exploded diagram, but it's remarkably similar to the new dura ace 7800 design shown on shimano's website. The drive side race is part of the axle, so you can service the freehub without disturbing the hub bearings. The right nut holds the whole freehub in place. Loosen the nut and then remove it while holding the freehub in place. Then slowly remove the freehub. Twisting it slightly counter clockwise while pulling it helps. Make sure you have a rag underneath. There are 3 small pawls and 3 very small springs you don't want to lose. The freehub rides on two cartridge bearings, which I never removed. Clean everything, re-grease, shoot some grease into the cartridge bearings, and reassemble. Again, turning the freehub slightly counter clockwise while while putting it back in helps. The nut doesn't have to be that tight because there is really no pressure on it and it makes it easier to remove next time.
I used Pedros grease.
danacf is offline   Reply With Quote
Old 03-29-08, 02:37 PM   #3
squeegy200
Senior Member
 
squeegy200's Avatar
 
Join Date: Oct 2004
Location: Southern California
Bikes: Colnago Altain, Klein Pulse II, Stumpjumper FSR, GT Zaskar LE, Pedalforce RS2
Posts: 1,377
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Branford bikes

Great information as well as Campagnolo Specific replacement parts can be found at Branford Bikes.

Here is the page detailing Campagnolo Chorus Rear Hubs

http://www.branfordbike.com/cgi-bin/...65415175#item8
__________________
98 Colnago Altain
08 Pedalforce RS2
00 Specialized Stumpjumper FSR
06 NYCbikes Single Speed (John Deere Special)
squeegy200 is offline   Reply With Quote
Old 03-29-08, 03:24 PM   #4
danacf
Senior Member
 
Join Date: Mar 2008
Location: Albany, NY
Bikes:
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
One other thing. Pay attention when you remove the cassette. The splines on the early hubs like mine were evenly spaced, meaning there isn't just one way the cogs go on. The cogs have letters which have to be orientated a particular way. There is a chart (which I still have) which shows how the letters should be aligned. You might want to draw a line across the teeth with a marker before you take it off.
danacf is offline   Reply With Quote
Old 04-10-08, 12:50 PM   #5
osmium
Senior Member
Thread Starter
 
Join Date: Sep 2003
Location: Atlanta, GA
Bikes: 3 Woodrup Star Trophy models, Bianchi Pista, Ochsner, Rockhopper, Puch Mistral Leader, Mercian Touring, Bridgestone XO-2, Basso Gap
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Okay,

It's official. My campy 8 speed rear wheel is dead. :-( Seems pitting occurred to the cup that has the bearings around the freehub. So now I have a set of Mavic Heliums on it that I bought just in case it was a terminal condition. Also, as a back up I'm going to build up some Camy Athena 8 speed wheels from a NOS hub. Ahh... these things happen.

cheers.
osmium is offline   Reply With Quote
Old 04-10-08, 11:19 PM   #6
axelwik
Yep
 
Join Date: Mar 2008
Location: Albuquerque, New Mexico
Bikes: Klein Quantum, Klein Rascal, Old road bike - now SS, Commuter
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I destroyed a Record hub by cranking too hard up a steep hill - the pawls bent the hub body and it would no longer coast or "freewheel." Broke an axle on another Record hub a few years earlier.
axelwik is offline   Reply With Quote
Old 04-11-08, 12:05 AM   #7
nuovorecord
Slave of the road
 
nuovorecord's Avatar
 
Join Date: Mar 2004
Location: Portland, Oregon
Bikes: Eddy Merckx, Falcon, Vitus
Posts: 243
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by osmium View Post
Okay,

It's official. My campy 8 speed rear wheel is dead. :-( Seems pitting occurred to the cup that has the bearings around the freehub. So now I have a set of Mavic Heliums on it that I bought just in case it was a terminal condition. Also, as a back up I'm going to build up some Camy Athena 8 speed wheels from a NOS hub. Ahh... these things happen.

cheers.
Bummer. I feel ya. I had the same thing happen to an identical rear hub. My shop guy told me it was due to a lack of maintenance over the years. He told me that I should have had it repacked annually. Maybe that's overkill, but it seems like cheap insurance to me now. Live and learn...
nuovorecord is offline   Reply With Quote
Old 04-11-08, 04:58 AM   #8
WNG
Spin Forest! Spin!
 
WNG's Avatar
 
Join Date: Sep 2007
Location: Arrid Zone-a
Bikes: I used to have many. And I Will again.
Posts: 5,967
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What generation Chorus is your's? If it was the previous generation <2006, then it's the same as the Record and Centaur. I posted about a problem in a Record freehub I acquired. It looked fine, but had a lot of resistance to turning on the axle.
Turns out, the bearing packs can flex and drop into the hub shell, past the bearing race, if one assembles the parts carelessly.
Once properly placed, the freehub spun fine and smooth.

If the LBS determined the damage was the cause of your's, I guess it's resolved. If it was a 90's era Chorus, not familiar with its design and failure states.
WNG is offline   Reply With Quote
Old 04-11-08, 05:40 AM   #9
osmium
Senior Member
Thread Starter
 
Join Date: Sep 2003
Location: Atlanta, GA
Bikes: 3 Woodrup Star Trophy models, Bianchi Pista, Ochsner, Rockhopper, Puch Mistral Leader, Mercian Touring, Bridgestone XO-2, Basso Gap
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hey all,

It was a 92-94 vintage chorus hub that I acquired used. Just one of those things that happens. Basically I needed a new axle, a freehub cone, bearings, and the freehub cup was pitted. So I took the logical solution and just got an Athena hub 94 vintage. Anything I should look out for on the 94 Athena. It is a NOS and going to build them and use them as back ups to the Mavic Heliums I have.
osmium is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 02:06 AM.