Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Campagnolo hub inner grease shield. Why?

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.

Campagnolo hub inner grease shield. Why?

Old 02-16-19, 11:56 AM
  #1  
gearbasher
Senior Member
Thread Starter
 
gearbasher's Avatar
 
Join Date: May 2009
Location: Sitting on my butt in front of a computer
Posts: 781
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 131 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Campagnolo hub inner grease shield. Why?

I was overhauling my Campy Record hubs (newest version) and, while trying to get all the old grease cleaned out, I dislodged one of the inner grease shields (HB-EU025).



While trying to get it back in position, it cracked on me (plastic). I can get another one, but I'm just wondering..Why are they even there? There are no injection ports to pump grease in. And, so what if you over grease the bearings and it gets between the shell and the axle. All previous versions of Record hubs had oil/grease injection holes that, if used, would fill the hub shell with grease. I'm thinking of just removing them. Any reason not to?

Last edited by gearbasher; 02-16-19 at 12:31 PM.
gearbasher is offline  
Old 02-16-19, 12:48 PM
  #2  
easyupbug 
Senior Member
 
Join Date: Jan 2013
Posts: 1,095

Bikes: too many sparkly Italians, some sweet Americans and a couple interesting Japanese

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 144 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I will speculate, grease does not do your bearings any good in the void between the hub shell and axle. Bearing grease can migrate away from the bearing where it is needed for long life.
easyupbug is offline  
Old 02-16-19, 02:55 PM
  #3  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 11,447

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1675 Post(s)
Likes: 0
Liked 7 Times in 6 Posts
Same reason why most bike used cartridge bearings still have seals on both sides. Andy
__________________
AndrewRStewart
Andrew R Stewart is offline  
Old 02-18-19, 04:54 PM
  #4  
drlogik 
Senior Member
 
drlogik's Avatar
 
Join Date: Mar 2016
Location: North Carolina
Posts: 1,031

Bikes: '87-ish Pinarello Montello; '89 Nishiki Ariel; '85 Raleigh Wyoming, '16 Wabi Special, '16 Wabi Classic, '14 Kona Cinder Cone

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 379 Post(s)
Likes: 0
Liked 4 Times in 3 Posts
That seal is needed to keep the grease from migrating out of the bearing race. As stated above, like a cartridge "sealed" bearing.
drlogik is offline  
Old 02-18-19, 05:16 PM
  #5  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 40,891

Bikes: 8

Mentioned: 182 Post(s)
Tagged: 0 Thread(s)
Quoted: 6549 Post(s)
Likes: 0
Liked 62 Times in 56 Posts
Old loose ball Freewheel hubs the outer race had that function.
fietsbob is offline  
Old 02-18-19, 07:38 PM
  #6  
gearbasher
Senior Member
Thread Starter
 
gearbasher's Avatar
 
Join Date: May 2009
Location: Sitting on my butt in front of a computer
Posts: 781
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 131 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Well, I just finished overhauling the rear hub. There was plenty of grease inside the hub shell, passed the shield. I guess they don't do a great job.
gearbasher is offline  
Old 02-18-19, 09:55 PM
  #7  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 11,447

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1675 Post(s)
Likes: 0
Liked 7 Times in 6 Posts
Seals are not really about lube containment as much as keeping the big bits of grit out. Andy
__________________
AndrewRStewart
Andrew R Stewart is offline  
Old 02-19-19, 12:08 PM
  #8  
Pridedog
Gone Biking!
 
Pridedog's Avatar
 
Join Date: Dec 2009
Location: Indiana
Posts: 68

Bikes: Litespeed, Redline Conquest Disc, Bike Friday, Cannnondale T2. Nashbar Winter Bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I broke the inner seal on a Zonda hubset about 10,000 miles ago. I haven't noticed a lack of grease when overhauling or a build up inside the hub. I did not replace the seal and see no reason to do so. I overhaul the hubs every 1,500-2,000 miles. I wouldn't worry about it. I know the seal had a purpose, but in my situation it has had no affect not being there.
Pridedog is offline  
Old 02-19-19, 04:10 PM
  #9  
gearbasher
Senior Member
Thread Starter
 
gearbasher's Avatar
 
Join Date: May 2009
Location: Sitting on my butt in front of a computer
Posts: 781
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 131 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Yeah, the more I think about it, the more I feel it's not necessary. Without it, it's even easier to clean out the old grease.
gearbasher is offline  
Old 02-19-19, 05:35 PM
  #10  
robertorolfo
Senior Member
 
robertorolfo's Avatar
 
Join Date: Jul 2017
Location: Queens, NY for now...
Posts: 880

Bikes: 82/82 Lotus Unique, 86 Lotus Legend, 89 Basso PR

Mentioned: 35 Post(s)
Tagged: 0 Thread(s)
Quoted: 506 Post(s)
Liked 7 Times in 6 Posts
Originally Posted by Pridedog View Post
I broke the inner seal on a Zonda hubset about 10,000 miles ago. I haven't noticed a lack of grease when overhauling or a build up inside the hub. I did not replace the seal and see no reason to do so. I overhaul the hubs every 1,500-2,000 miles. I wouldn't worry about it. I know the seal had a purpose, but in my situation it has had no affect not being there.
Can I ask a question (in a completely non-antagonistic way)? Why do you overhaul your hubs at that frequency? Do you ride in all weather? Is that really necessary if you are ride in mostly dry conditions with a particular set of hubs/wheels? Asking for a friend that also has Zonda wheels...
robertorolfo is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.