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

Do I have a bad cassette?

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.

Do I have a bad cassette?

Old 04-28-12, 07:19 PM
  #1  
pepperbelly
old newbie
Thread Starter
 
Join Date: Nov 2009
Location: Fort Worth, Texas
Posts: 50
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Do I have a bad cassette?

I have an early to mid '80s Raleigh Technium. Today when I was lubing the chain I noticed that it didn't want to freewheel. In fact at first when I stopped moving the pedals the rear wheel stopped too, almost like the brake was dragging. I made sure the brake was free and it kept doing it. I could move the pedals in reverse and the wheel turned in reverse with it.
I applied a little oil into the bearings to see if it helped and it did- some at least.
I then noticed that when I rotated the pedals and then let it freewheel the cassette seemed to move up and down some. I am new to working on bikes but that doesn't seem right even to me.

I looked at the hubs. I think they are mallards.

Is this something probably in the bearings hub or in the cassette itself?
I know it is very hard to diagnose over the 'net and I will take it to my LBS to get it checked. I am just wanting to get an idea what I will be looking forward to.

Thanks,
Jim

Last edited by pepperbelly; 04-28-12 at 07:28 PM. Reason: added info
pepperbelly is offline  
Old 04-28-12, 09:51 PM
  #2  
surreal
Senior Member
 
surreal's Avatar
 
Join Date: Mar 2002
Location: NJ
Posts: 3,084
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Pep,
It may help if we knew for sure what kind of rear hub you're running. If it is indeed a Maillard, you might worry that it is a Helicomatic, which would mean your life now sucks. It was a cool hub, with a very interesting freewheel, but finding replacements these days is expensive. Incidentally, if it is a Maillard Helicomatic, then you're dealing with a freewheel rather than a cassette, and the problem is likely in the freehub itself. Some folks find that some penetrating oil will un-stick stuck pawls in a freewheel, but I tend to replace.

If you're running a freewheel hub that is NOT a helicomatic, you'll likely need to replace the freewheel, but you won't have such a hard time finding a suitable replacement. If your shifting is friction, it will be very easy. If this beast has indexed shifting, you may need to be careful that you get a replacement with compatible spacing between the cogs.

If you actually have a cassette, the problem is likely in the freehub body rather than the cassette itself. If this is the case, you'll need to get a new freehub body, which may be difficult depending on exactly which hub we're talking about here.

In any case, a trip to the LBS will likely yield some information, although it is very possible that they'll try to get you to bail on the entire wheel and get a new one.

-rob
surreal is offline  
Old 04-29-12, 12:07 AM
  #3  
dabac
Senior Member
 
Join Date: Mar 2008
Posts: 7,936
Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 813 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by surreal View Post
Pep,
It may help if we knew for sure what kind of rear hub you're running. If it is indeed a Maillard, you might worry that it is a Helicomatic, which would mean your life now sucks. It was a cool hub, with a very interesting freewheel, but finding replacements these days is expensive. Incidentally, if it is a Maillard Helicomatic, then you're dealing with a freewheel rather than a cassette, and the problem is likely in the freehub itself. Some folks find that some penetrating oil will un-stick stuck pawls in a freewheel, but I tend to replace.

If you're running a freewheel hub that is NOT a helicomatic, you'll likely need to replace the freewheel, but you won't have such a hard time finding a suitable replacement. If your shifting is friction, it will be very easy. If this beast has indexed shifting, you may need to be careful that you get a replacement with compatible spacing between the cogs.

If you actually have a cassette, the problem is likely in the freehub body rather than the cassette itself. If this is the case, you'll need to get a new freehub body, which may be difficult depending on exactly which hub we're talking about here.

In any case, a trip to the LBS will likely yield some information, although it is very possible that they'll try to get you to bail on the entire wheel and get a new one.

-rob
+1 on all of the above.

Also, keep in mind that when freewheeling, all that the cassette/freewheel bearing has to deal with is the weight of the chain, not really a pressing task. It's quite common to have the sprockets move around a little.
It's unlikely to be related to the sticking issue, and unless it's increasing, shouldn't be a problem.
dabac is offline  
Old 04-29-12, 12:12 AM
  #4  
pepperbelly
old newbie
Thread Starter
 
Join Date: Nov 2009
Location: Fort Worth, Texas
Posts: 50
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The rear hub is marked Mallard.
pepperbelly is offline  
Old 04-29-12, 05:04 AM
  #5  
surreal
Senior Member
 
surreal's Avatar
 
Join Date: Mar 2002
Location: NJ
Posts: 3,084
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I don't have much else to add, except that I was wrong; the Helicomatic is indeed technically a cassette rather than a freewheel, as the freewheeling mechanisms are housed in the weird splined/tornado-looking jawn. Sorry if this caused any confusion. Also, to reiterate what I said above: if you bring that thing into the typical bikeshop, they will sell you a new wheel.

Again, this is only true of the Helicomatic models. Maillard did, indeed, make traditional thread-on freewheel hubs, but a mid-80s technium would be a prime candidate for the Helicomatic hub...
surreal is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jefnvk
Great Lakes
1
07-05-16 09:58 PM

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.